SPAU 320 C Overvoltage, undervoltage and residual voltage ...€¦ · 6 The voltage measured by the over- and under-current modules is connected to terminals 13-14 when the rated

IRF

0008

A

[ ]s>t

0.5

0.05 1.0

50

10

0.5

0.05 1.0

2

10

20

STEP

RESET

SG1

0 1

12345678

STEP

>U >>U

SPCU 1C6

>>

[ ]s>>t

U o

nU>U o

nUUo 80

o o

[ ]%

[ ]%

U

∞

U aux

Ser.No.

80...265 V

18...80 V

2

5

SGR

0 1

~–

U1 U2 U3

–

0 000 0 000 0 000

fn= 50Hz

60Hz

12345678

SPAU 320 C

0160

B

SPCU 1C6

nU /= V( )U100 110

nU /= V( )U100 110 o

12345

n )(U o>

/ >tt %[ ]>>/tt %[ ]

/ nU Uo %[ ]

>>n )(U o

RS 613

SPCU 1C1

12345678

/ >tt %[ ]

n )(U >/ nU Umin

/ nU U>

/ nU Umax

n )(U <

/tt %[ ]<

/ nU U<

SPCU 1C1

12345678

/ >tt %[ ]

n )(U >/ nU Umin

/ nU U>

/ nU Umax

n )(U <

/tt %[ ]<

/ nU U<

1.2

>U

U

0044

A

[ ]sk

>t0.5

0.05 1.0

0.8

0.4

0.5

0.1 1.0

0.8

1.2

1.6

STEP

RESET

SG1

12345678

STEP

U 

nUU

B

0 11.2

>U

U

0044

A

[ ]sk

>t0.5

0.05 1.0

0.8

0.4

0.5

0.1 1.0

0.8

1.2

1.6

STEP

RESET

SG1

12345678

STEP

U 

nUU

B

0 1

SPAU 320 COvervoltage, undervoltageand residual voltage relay

User´s manual and Technical description

2

1MRS 750726-MUM EN

Issued 1997-04-21Modified 2003-10-06Version C (replaces 34 SPAU 10 EN1)Checked PSApproved MÖ

Data subject to change without notice

SPAU 320 COvervoltage,

undervoltage andresidual voltage relay

Contents Features .......................................................................................................................... 3Application ..................................................................................................................... 3Description of operation ................................................................................................. 4Connection ..................................................................................................................... 5Operation indicators and push-buttons .......................................................................... 8Signal flow diagram and configuration switches (modified 2003-10)............................... 9Power supply module .................................................................................................... 11Output relay module .................................................................................................... 12Technical data (modified 2002-04) ................................................................................ 13Applications .................................................................................................................. 15Maintenance and repair ................................................................................................ 22Spare parts .................................................................................................................... 22Delivery alternatives ..................................................................................................... 22Dimension drawings and mounting.............................................................................. 23Ordering information ................................................................................................... 23

The complete manual for the voltage measuring relay SPAU 320 C includesthe following submanuals:

Overvoltage, undervoltage and residual voltage relay,General part 1MRS 750726-MUM ENResidual overvoltage relay module SPCU 1C6 1MRS 750509-MUM ENOver- and undervoltage relay module SPCU 1C1 1MRS 750609-MUM ENGeneral characteristics of C-type relay modules 1MRS 750328-MUM EN

3

Features Powerful software support for setting and moni-toring of the relay via a portable computer

Continuous self-supervision of relay hardwareand software with autodiagnosis for enhancedsystem reliability and availability

Robust aluminium relay case with IP54 degreeof protection by enclosure

High immunity to electrical and electromag-netic interference

CE marking according to the EC directive forEMC

Supervision and protection relay primarily usedfor supervision of substation busbar voltages

General-use voltage relay for applications requir-ing overvoltage or undervoltage supervision

Flexible selection of appropriate operational fea-tures in various applications

Local numerical display of setting values, meas-ured values, recorded fault values, auto-diagnos-tic fault codes, etc.

Serial interface for two-way data communicationwith substation level equipment via fibre-optic bus

Application The overvoltage, under voltage and residualvoltage relay SPAU 320 C is intended to be usedfor the supervision of the residual voltage as wellas for the overvoltage and under voltage of thebusbar system. The relay forms an integratedprotection consisting of three measuring relaymodules. The residual voltage of the busbar sys-tem is measured by the dual-stage overvoltagerelay module SPCU 1C6. The overvoltage and

undervoltage of the busbar system is supervisedby two voltage relay modules SPCU 1C1, eachof which is provided with an overvoltage andan undervoltage stage. By means of an optionalbus connection module the relay can be con-nected to the fibre-optic SPA bus for serial datacommunication with substation level equip-ment.

4

Description ofoperation

When the residual voltage of the busbar systemexceeds the setting value of the lower stage ofthe residual voltage module SPCU 1C6, theovervoltage stage starts and simultaneously startsthe corresponding timing circuit. When the settime has elapsed, the module delivers a trippingsignal. The higher stage of the residual voltagemodule operates in the same way. When thesetting value of the stage has been exceeded itstarts, simultaneously starting its timing circuitand performs tripping when the set time haselapsed.

When the voltage measured by the voltage re-lay module SPCU 1C1 exceeds the setting valueof the overvoltage stage, the overvoltage stagestarts and performs a tripping when the set timedelay has elapsed. When the voltage measuredby the module falls below the setting value ofthe undervoltage stage, the timing circuit of theundervoltage stage starts. When the set timedelay has expired tripping is performed by thestage.

Since the protective relay comprises two identi-cal voltage relay modules SPCU 1C1, theovervoltage and undervoltage protection of thebusbar system can be implemented as a dual-stage protection.

To prevent unnecessary operations during anauto-reclose cycle, starting and tripping of theundervoltage stage of the overvoltage and under-voltage modules SPCU 1C1 can be blocked byturning switch SGl/5 on the front panel intothe position 1. This measure prevents any op-eration of the U < stage, if the measured voltagefalls below the value of 0.2 x Un (see fig. 1) .

Tripping of the undervoltage stage alone maybe blocked by linking an external blocking sig-nal to the relay.

NOTE!To enable the blocking function, switch 5 ofswitchgroup SGB on the PC board of the volt-age relay module SPCU 1C1 has to be in posi-tion 1.

Fig. 1. Operating scheme for voltage relay module SPCU 1C1, when starting of the undervoltagestage is internally blocked

U>/Un Setting of the overvoltage stageU</Un Setting of the undervoltage stageSS1 Starting of the overvoltage stageTS1 Tripping of the overvoltage stageSS2 Starting of the undervoltage stageTS2 Tripping of the undervoltage stage

U/Un

U<Un

U>Un

0.2 x Un

SS1TS1

SS2TS2

t

t

t

t>

t<

10

10

10

10

5

Connections

Fig. 2. Connection diagram for overvoltage, undervoltage and residual voltage relay SPAU 320 C.

Uaux Auxiliary voltageA, B, C, D, E, F Output relaysIRF Internal relay faultSS1, SS2 Output signals for startingTS1, TS2 Output signals for trippingBS1 Blocking input signalSGR Switchgroup for tripping configurationU1 Residual voltage relay module SPCU 1C6U2, U3 Over- and under voltage relay module SPCU 1C1U4 Output relay unit SPTR 6B3U5 Power supply moduleU6 Interface module SPTE 3B4SPA-ZC_ Bus connection moduleRx/Tx Serial communication interface

63 13 14 1510

0 V

110

V

100

V11

0 V

28 29 30 10 11

U6U5

+ –61 62

F

70 71 72 79 80 81

E D C

76 77 78 73 74 75 67

B A

68 69 65 66

4

111

3216578

1

SGR

1 1 1 1 1 1

TS 1

TS 1

TS 1

TS 2

TS 2

TS 2

SS 2

SS 2

SS 1

SS 1

U4

U1

SPAU 320 C

BS 1

BS 1

BS 1

BS 1

U2

U3

IRF

IRF

IRF

I/O

I/O

I/O

U<

U

U>

Uo>

Uo>>

Rx Tx

SP

A-Z

C_

+ (~)– (~)Uaux

+da

dn

A

N

L1L2

L3

6

The voltage measured by the over- and under-current modules is connected to terminals 13-14 when the rated voltage of the secondary cir-cuits is 100 V. If the rated voltage is 110 V, thevoltage to be measured is connected to termi-nals 13-15.

The voltage measured by the residual voltagemodule is connected to terminals 28-29 or 28-30, depending on the rated voltage of the sec-ondary circuits, 100 V or 110 V.

Tripping of the under voltage stage of the un-der voltage and overvoltage modules can beblocked by connecting an external blocking sig-nal, BS1, to terminals 10-11.

The auxiliary supply voltage is connected to ter-minals 61-62. At d.c. auxiliary supply voltagethe positive lead is connected to terminal 61.The level of the voltage to be applied on theterminals is determined by the power supplymodule used in the protection scheme. For fur-ther details see the description of the power sup-ply module. The auxiliary voltage is marked onthe front panel.

The tripping signals from the measuring mod-ules are provided by output relay A. The signalsto be linked to output relay A are selected bymeans of the switches SGR/1, 2, 3 and 4 at thefront edge of the output relay module. Switch 1is used for selecting the trippings of the over-voltage stage of the voltage modules SPCU 1C1and switch 2 for selecting the trippings of theundervoltage stage. The tripping signals fromthe operating stages of the residual voltage mod-ule are programmed with switches 3 and 4.

Tripping of the high-set stage of the residualvoltage module causes an alarm signal throughoutput relay B. Further, the tripping signals fromthe overvoltage modules are linked to this out-

put relay via switch SGR/5, and the trippingsignals from the undervoltage stage via switchSGR/6.

Output relay provides an alarm signal at trip-ping of the overvoltage stage of both voltagemodules SPCU 1C1. Further, the starting sig-nals of these operating stages can be pro-grammed to output relay C by means of switchSGR/7.

In the same way output relay D provides an alarmsignal at tripping of the undervoltage stage of bothovervoltage and undervoltage modules. Startingof the under voltage stages provides an alarm sig-nal through switch SGR/8.

Tripping of the lower operating stage of the re-sidual voltage module provides an alarm signalthrough output relay E.

Output relay F, terminals 70-71-72, operates asthe output relay of the self-supervision systemof the entire relay assembly. The relay operateson the closed circuit principle so that in normalservice conditions the contact gap 70-72 isclosed. If a fault is descovered by the self-super-vision system, or if there is a failure in the aux-iliary supply, the output relay drops off provid-ing an alarm signal by closing the NC) contact71-72.

The feeder protection is interfaced with the datatransmission bus through a 9-pole, so called D-type connector located in the centre of the rearpanel of the protective relay. By using a match-ing module, SPA ZC1, the protective relay canbe linked to a fibre-optic bus. The terminals ofthe fibre-optic cables are connected to the coun-ter terminals Rx and Tx on the matching mod-ule. The fibre-optic cables are linked from oneprotection to another as well as to the controldata communicator, e.g. SACO 100M.

7

13

14

15

28

29

30

1011

73

74

75

76

77

78

79

80

81

61

62

63

65

66

67

68

69

70

71

72

131415

282930

6162

63

6566676869

707172

1011

737475

767778798081

Fig. 3. Rear wiew of the overvoltage, undervoltage and residual voltage relay SPAU 320 C.

8

Operationindicators andpush-buttons

3. The front panels of both relay modules areprovided with a numerical display for indi-cation of measured and set values, two push-buttons marked STEP and RESET, a pro-gramming switchgroup SG1 for selection ofrelay functions and four setting knobs for op-eration values. The STEP push-button canbe used for scanning through the measuredand set values of the module and for presen-tation of the values concerned on the displayof the module. The RESET push-button isused for resetting locally the red operationindicators for tripping. An unreset operationindicator does not affect the operation of therelay module and thus, the module is constan-tely operative.

4. The front panels of the relay modules are pro-vided with a red LED used as a self-supervi-sion alarm indicator IRF which indicates thatthe self-supervision system has detected a per-manent fault in the protection relay. Further,the relay modules are provided with separateLED indicators on the front panel for indi-cation of the measured residual and phase-to-phase voltages.

5. The cover of the protection relay case is madeof transparent, UV-stabilized polycarbonatepolymer and provided with three push-but-tons for scanning of the relay parameters bymeans of the separate displays of the mod-ules and the STEP push-buttons inside thecover. To enable resetting of the modules bymeans of the RESET push-buttons, the coverof the relay case must be opened using thelocking screws for the case.

Detailed operation instructions are given in themanuals describing the individual relay mod-ules and in the document "General characteris-tics of C-type relay modules".

Fig. 4. System front panel of the overvoltage,undervoltage and residual voltage relay SPAU320 C.

1. The green LED Uaux on the system panel islit when the power supply of the relay is op-erating.

2. The relay modules are provided with twooperating stages and each stage has its ownyellow/red LED operation indicator. The op-eration indicator goes on with a yellow lightwhen the operation stage starts and with ared light, if the stage delivers a tripping sig-nal as well. The LED indicators can be givenself-reset or manual reset mode of operation.Normally, when the stage resets, the red op-eration indicator remains lit after beingswitched on to indicate by which stage thetripping was initiated.

U aux

Ser.No.

80...265 V

18...80 V

2

5

SGR

0 1

~–

U1 U2 U3

–

0 000 0 000 0 000

fn= 50Hz

60Hz

12345678

SPAU 320 C

0160

B

SPCU 1C6

nU /= V( )U100 110

nU /= V( )U100 110 o

12345

n )(U o>

/ >tt %[ ]>>/tt %[ ]

/ nU Uo %[ ]

>>n )(U o

RS 613

SPCU 1C1

12345678

/ >tt %[ ]

n )(U >/ nU Umin

/ nU U>

/ nU Umax

n )(U <

/tt %[ ]<

/ nU U<

SPCU 1C1

12345678

/ >tt %[ ]

n )(U >/ nU Umin

/ nU U>

/ nU Umax

n )(U <

/tt %[ ]<

/ nU U<

9

Signal flowdiagram andconfigurationswitches

The internal signals of the overvoltage, under-voltage and residual voltage relay SPAU 320 Cand the configuration switches are illustrated infig. 5.

In certain applications it may be necessary toalter the factory settings of the configurationswitches to obtain the required control signalsand function of the protection relay.

Fig. 5. Internal control signals between the relay modules of the overvoltage, undervoltage andresidual voltage relay SPAU 320 C.

SG

B

SPCU 1C6 (unit 1)

TS

1T

S2Uo>

>U

o>

t>>

t>

U Uo

BS

1

1 2

3 4

5 6

7 8

SG

B

SPCU 1C1 (unit 2)

TS

1T

S2U



t< k<t> k>

1 2

3 4

5 6

7 8

SS

1S

S2

SG

B

SPCU 1C1 (unit 3)

TS

1T

S2U



t< k<t> k>

1 2

3 4

5 6

7 8

SS

1S

S2

Rel

ay A

Rel

ay B

Rel

ay C

Rel

ay D

Rel

ay E

SG

R1 2 3 4 5 6 7 8

10

Configurationswitches(modified 2003-10)

The functions of the starting and tripping sig-nals are programmed with switchgroup SGR,located at the front panel of the output relaymodule. The switches are programmed throughan opening on the system panel.

The PC boards of the measuring relay modulescontain the programming switchgroups SGB,the switches of which are used for programmingthe blocking signals applied on the modules ofthe protection SPAU 320 C.

The switches have the following functions:

Switch Function

SGR/1 Links the tripping signal of stage U> of the over- and undercurrent modules to out-put relay A.

SGR/2 Links the tripping signal of stage U< of the over- and undercurrent modules to out-put relay A

SGR/3 Links the tripping signal of stage U0> of the residual voltage module to output relay A.SGR/4 Links the tripping signal of stage U0>> of the residual voltage module to output

relay ASGR/5 Links the tripping signal of the U> stage of both under- and overvoltage modules to

output relay BSGR/6 Links the tripping signal of the U< stage of both under- and overvoltage modules to

output relay BSGR/7 Links the starting signal of the U> stage of both under- and overvoltage modules to

output relay CSGR/8 Links the starting signal of the U< stage of both under- and overvoltage modules to

output relay D.

Switch Function

SGB/1 No function in SPAU 320 C. Has to be in position 0SGB/2 No function in SPAU 320 C. Has to be in position 0.SGB/3 No function in SPAU 320 C. Has to be in position 0.SGB/4 Blocks the tripping of the U0>> stage via signal BS1.SGB/5 Blocks the tripping of the U0>> stage via signal BS1.SGB/6 No function in SPAU 320 C. Has to be in position 0.SGB/7 No function in SPAU 320 C. Has to be in position 0.SGB/8 No function in SPAU 320 C. Has to be in position 0.

The SGB switches on the PC board of the re-sidual voltage module SPCU 1C6 have the fol-lowing functions:

The SGB switches on the PC boards of bothover- and undercurrent modules have the fol-lowing functions:

Switch Function

SGB/1 No function in SPAU 320 C. Has to be in position 0SGB/2 No function in SPAU 320 C. Has to be in position 0.SGB/3 No function in SPAU 320 C. Has to be in position 0.SGB/4 No function in SPAU 320 C. Has to be in position 0.SGB/5 Blocks the U< stage via signal BSl.SGB/6 No function in SPAU 320 C. Has to be in position 0.SGB/7 No function in SPAU 320 C. Has to be in position 0.SGB/8 No function in SPAU 320 C. Has to be in position 0.

11

Power supplymodule

The power supply module is located behind thesystem front panel of the relay together withthe output relay module. The supply module isa separate relay module and can be withdrawnafter removal of the system front panel. Thepower supply module produces the voltages re-quired by the relay modules from the auxiliarysupply voltage.

There are two types of power supply modules,differing only in input voltage:

SPGU 240 A1:Nominal voltage Un = 110/120/230/240 V ac

Un = 110/125/220 V dcOperative range U = 80...265 V ac/dc

SPGU 48 B2:Nominal voltage Un = 24/48/60 V dcOperative range U = 18...80 V dc

The power supply type is marked on the systemfront panel.

The power supply module is a transformer con-nected, i.e. galvanically separated primary andsecondary circuits, flyback type rectifier. Theprimary circuit is protected by a fuse F1, 1A(slow) in SPGU 240 A1 and 4A (fast) in SPGU48 B2, which are located on the printed circuitboard of the module.

When the power supply is on, a green LED in-dicator Uaux is lit on the system panel. The su-pervision of the supply voltages for the electron-ics is located on the regulating modules. Theself-supervision alarm is given, if any of the sec-ondary voltages differ more than 25% from thenominal value. Also, if the power supply mod-ule is missing, or if there is no auxiliary supplyto the voltage regulator at all, an alarm is given.

12

Output relaymodule

The output relay module SPTR 6B3 is locatedbehind the system front panel of the relay to-gether with the power supply module. The out-put relay module forms its own withdrawablerelay module after removal of the system front

plate. The module contains all output relays,A...F, the control circuits of the relays as well asthe electronic circuitry of the external controlinputs.

Fig. 6. Block diagram for the output relay module SPTR 6B3.

TS1/U1 Tripping signal of stage U0>TS2/U1 Tripping signal of stage U0>>SS1/U2 Starting signal of stage U>TS1/U2 Tripping signal of stage U>SS2/U2 Starting signal of stage U<TS2/U2 Tripping signal of stage U<BS1 External blocking input signal to stage U<A Tripping output relay A (heavy-duty) for all stages, U0>, U0>>, U> and U>, U> and U<C Alarm signal output relay C for stage U>D Alarm signal output relay D for stage U<E Alarm signal output relay E for stage U0>F Self-supervision output relay FIRF Self-supervision input signalSGR Switchgroup for programming of starting and tripping signalsENA Enable output signal from control circuits

The input and output signals of the output re-lay module are related to the fixed positions ofthe relay modules which cannot be changed inthe relay housing. The output signals from eachrelay module and PC-board location are wiredindividually to the output relay module. It must

be pointed out that the relay modules have tobe plugged into the relay case as illustrated inthe figure on the front page in order to securethat the connection diagram drawn for the re-lay assembly also would correspond to the physi-cal function of the protective device.

13

Technical data(modified 2002-04)

Energizing inputsRated voltage Un 100/110 VContinuous voltage withstand 1.7 x UnBurden at rated voltage < 0.5 VARated frequency fn 50 HzRated frequency on request 60 Hz

Contact outputsTerminals 65-66Rated voltage 250 V dc/acCarry continuously 5 AMake and carry for 0.5 s 30 AMake and carry for 3 s 15 ABreaking capacity for dc when the control circuittime constant L/R ≤40 ms, at 48/110/220 V dc 5 A/3 A/1 A

Alarm contacts 67-68-6970-71-7273-74-7576-77-7879-80-81

Rated voltage 250 V dc/acCarry continuously 5 AMake and carry for 0.5 s 10 AMake and carry for 3 s 8 ABreaking capacity for dc when the control circuittime constant L/R ≤40 ms, at 48/110/220 V dc 1 A/ 0.25 A/ 0.15 A

External control inputsTerminals 10-11Control voltage levels 18…265 V dc or 80…265 V acCurrent drain, typically 1 mA

Power supply moduleSupply module, type SPGU 240 A1 80…265 V dc/acSupply module, type SPGU 110 B1 40…150 V dc (on request)Supply module, type SPGU 48 B1 18…60 V dcPower consumption under quiescent/operating conditions ~10 W/~15

Residual overvoltage relay module SPCU 1C6See "Technical data" in the document 1MRS 750509-MUM EN for the relay module.

Over- and undervoltage relay module SPCU 1C1See "Technical data" in the document 1MRS 750609-MUM EN for the relay module.

14

Data communicationTransmission mode Fibre-optic serial busCoding ASCIIData transfer rate, selectable 300, 1200, 2400, 4800 or 9600 BdOptical bus connection module powered fromthe host relay- for plastic-core cables SPA-ZC 21 BB- for glass-fibre cables SPA-ZC 21 MMOptical bus connection module powered fromthe host relay or from an external power source- for plastic-core cables SPA-ZC 17 BB- for glass-fibre cables SPA-ZC 17 MM

Insulation Tests *)Dielectric test IEC 60255-5 2 kV, 50 Hz, 1 minImpulse voltage test IEC 60255-5 5 kV, 1.2/50 µs, 0.5 JInsulation resistance measurement IEC 60255-5 >100 MΩ, 500 Vdc

Electromagnetic Compatibility Tests *)High-frequency (1 MHz) burst disturbance testIEC 60255-22-1- common mode 2.5 kV- differential mode 1.0 kVElectrostatic discharge test IEC 60255-22-2 andIEC 61000-4-2- contact discharge 6 kV- air discharge 8 kVFast transient disturbance test IEC 60255-22-4and IEC 61000-4-4- power supply 4 kV- I/O ports 2 kV

Environmental conditionsService temperature range -10...+55°CTemperature dependence <0.2%/°CTransport and storage temperature rangeaccording to IEC 60068-2-8 -40...+70°CDamp heat test according to IEC 60068-2-30 ≤95%, 55°C, 6 cyclesDegree of protection by enclosure of flush mountingrelay case according to IEC 60529 IP54Weight of fully equipped relay 5.5 kg

*) The tests do not apply to the serial port, which is used exclusively for the bus connection module.

15

AppIications

Example 1.Supervision ofsubstation busbarsystem voltages

63 13 14 1510

0 V

110

V

100

V11

0 V

28 29 30 10 11

U6U5

+ –

61 62

F

70 71 72 79 80 81E D C

76 77 78 73 74 75 67

B A

68 69 65 66

4

111

3216578

1

SGR

1 1 1 1 1 1

TS 1

TS 1

TS 1

TS 2

TS 2

TS 2

SS 2

SS 2

SS 1

SS 1

U4

U1

SPAU 320 C

BS 1

BS 1

BS 1

BS 1

U2

U3

IRF

IRF

IRF

I/O

I/O

I/O

U<

U

U>

Uo>

Uo>>

Rx Tx

SP

A-Z

C_

+ (~)– (~)Uaux

++

+da

dn

A

N

L1L2

L3

0

0

+

Fig. 7. SPAU 320C used for the supervision of the busbar system voltages of a substation.

16

The voltage module U1 (SPCU 1C6) measuresthe residual voltage of the open-delta windingof the voltage transformers of the busbar sys-tem. An earth-fault occuring in a section of agalvanically connected network, produces a re-sidual voltage, the level of which is higher, thesmaller the resistance of the earth-fault point.

The lower stage of the residual voltage moduleU1 can be given either a signalling or a trippingfunction. When the stage has a tripping func-tion, as illustrated in fig. 7, the value of the start-ing voltage is set above the setting of the earth-fault relays of the feeders. Then the module actsas a back-up protection for the feeders and tripsthe circuit-breaker of the incoming cubicle, if,for some reason, the earth-fault protection ofthe feeder would not operate.

The higher stage of the module U1 has a trip-ping function. This stage is used mainly for the

earth-fault protection of the busbar system andthe back-up protection for the outgoing feedersat earth-faults with very low resistances. Thehigher voltage stage also operates as the earth-fault protection of the incoming cubicle, if thetripping signal is linked to the circuit-breakerof the overvoltage side of the supply transformer,see fig. 7. The same operating time is selectedfor both stages of the residual voltage module.The tripping signals from the two stages are re-ceived over output relay A, by means of switchesSGR/3 and 4. In addition, the tripping signalof the higher stage is also received over outputrelay B. The alarm signal for earth-fault is pro-vided by output relay E.

The voltage relay modules U2 and U3 (SPCU1C1) measure the main voltage, thus operatingas overvoltage and undervoltage protections.The operating principle of the protection is il-lustrated in fig. 8.

relays A and B

0.1

1

10

100

1000

t[s]

50 60 70 80 90 100 110 120 130 140 U/Un [%]

relay Crelay A relay D

Fig. 8. Operating principle of the busbar system overvoltage and undervoltage protection.(- - = alarm, – = tripping)

Setting example:

Module U2:U> = 1.1 x Un (inverse time, curve A)U> starting time = 60 sk> = 0.7

U< = 0.85 x Un (definite time)U< starting time = 30 st< = 100 s

Module U3:U> = 1.35 x Un (definite time)U> starting time = 0.1 st> = 0.5 s

U< = 0.6 x Un (definite time)U< starting time = 30 st< = 3 s

17

The operation of the overvoltage protection maybe based on the principle that when the voltagetends to be too high, an alarm signal is providedby the overvoltage stage of module U2, andwhen the voltage level continues to grow, thestage performs tripping. The overvoltage stageof module U3 operates as an instantaneous high-set stage.

The overvoltage withstand capability of theequipment to be connected to the network isreciprocally proportional to the magnitude ofthe overvoltage. This makes the inverse timecharacteristic well adapted for the overvoltagestage of module U2. At an inverse time modeof operation the protection provides an alarmsignal when the voltage level reaches the setvalue. If the voltage exceeds the setting value by6%, the relay performs tripping after a timedelay depending on the overvoltage. The oper-ating characteristic A allows a relatively lowalarm limit to be selected, and yet, the operat-ing time will be long enough for the voltageregulator to operate also at large voltage fluc-tuations. The operation of the instantaneoushigh-set stage is based on a definite time char-acteristic.

The operation of the undervoltage protectionmay be based on the principle that the under-voltage stage of module U2 initially provides

an alarm signal, and if the under voltage situa-tion persists, it performs tripping. The under-voltage stage of module U3 operates as an in-stantaneous high-set stage.

The undervoltage stage starts in a short circuitsituation as well. The best way of obtaining se-lectivity is to select a definite time characteris-tic for both the undervoltage protection and theshort circuit protection. Another alternative isto use the inverse time characteristic for bothundervoltage protection and short circuit pro-tection.

Groundless operation of the undervoltage pro-tection due to auto-reclosures is prevented bymeans of switch SG1 /5. When turning SG1 /5into the position 1, the undervoltage stage isprevented from operating, if the voltage falls toless than 20% of Un.

The tripping signals from the overvoltage pro-tection are received over the output relays A andB, switches SGR/1 and 5, whereas the trippingsignals from the undervoltage protection is re-ceived over output relay C, switch SGR/7. Out-put relay C also provides an alarm signal atovervoltage. The alarm signal for undervoltageis received over output relay D, switch SGR/8,as is the alarm signal for tripping.

18

Example 2.Supervision ofsubstation busbarsystem voltages

Another example of how to arrange the super-vision of the busbar system voltages is illustratedin fig. 9, where the supervision is based on theuse of the residual voltage module SPCU 1C6and only one overvoltage/undervoltage moduleSPCU 1C1 .

The lower stage of the residual voltage moduleU1 has been used as a signalling earth-fault pro-tection, and thus the stage has been given a moresensitive setting than the earth-fault relays ofthe feeders. In this way also high resistance earth-faults are indicated. The alarm signal is receivedover output relay E.

The higher voltage stage of the residual voltagemodule has a tripping function. The higher stageoperates as the back-up protection for the earth-fault protections of the outgoing feeders and asthe earth-fault protection of the busbar system.

The tripping signals from the overvoltage andundervoltage protection and from the higherstage of the residual voltage module is linkedonly to the circuit-breaker of the undervoltageside of the supply transformer, via output relayA (switches SGR/1, 2 and 4). A common alarmsignal for tripping is received from output relayB, switches SGR/5 and 6. This system is espe-cially well adapted to be used with reportingsystems with serial communication facilities.Then a detailed information about the functioncausing the tripping, including time markings,is provided by the substation level reporting sys-tem.

Information about starting of the overvoltageor undervoltage stage is received over the out-put relays C and D, switches SGR/7 and 8. Byusing short starting times, the output relays canbe used for supervising the voltage regulatorequipment. Output relay C prevents the tap-changer from stepping down and output relayD prevents it from stepping up.

19

63 13 14 1510

0 V

110

V

100

V11

0 V

28 29 30 10 11

U6U5

+ –

61 62

F

70 71 72 79 80 81

E D C

76 77 78 73 74 75 67

B A

68 69 65 66

4

111

3216578

1

SGR

1 1 1 1 1 1

TS 1

TS 1

TS 2

TS 2

SS 2

SS 1

U4

U1

SPAU 320 C1

BS 1

BS 1

BS 1

U2

IRF

IRF

I/O

I/O

U

Uo>

Uo>>

Rx Tx

SP

A-Z

C_

+ (~)– (~)Uaux

+

+da

dn

A

N

L1L2

L3

0

Fig. 9. SPAU 320 C1 used for the supervision of substation busbar system voltages.

20

Example 3.Supervision ofdistribution switch-gear busbar systemvoltages in industrialplants

63 13 14 1510

0 V

110

V

100

V11

0 V

28 29 30 10 11

U6U5

+ –

61 62

F70 71 72 79 80 81

E D C

76 77 78 73 74 75 67

B A

68 69 65 66

4

111

3216578

1

SGR

1 1 1 1 1 1

TS 1

TS 1

TS 2

TS 2

SS 2

SS 1

U4

U1

SPAU 320 C1

BS 1

BS 1

BS 1

U2

IRF

IRF

I/O

I/O

U

Uo>

Uo>>

Rx Tx

SP

A-Z

C_

+ (~)– (~)Uaux

+

+da

dn

A

N

L1L2

L3

0

Fig. 10. SPAU 320 C1 used for the supervision of distribution switchgear busbar system voltagesin an industrial plant.

21

The residual voltage module U1 measures theresidual voltage in the open-delta winding ofthe voltage transformers. The lower stage of theresidual voltage module may be used for releas-ing the neutral current relays of the feeders.When an earth-fault occurs in a feeder, boththe neutral current relay of the feeder and thelower stage of the residual voltage relay of thebusbar system must start to enable tripping ofthe circuit-breaker. In this manner groundlessoperations of the neutral current relay areavoided in short-circuit situations, at motorstart-ups or in normal service conditions.

The higher stage of the residual voltage moduleU1 is used for the earth-fault protection of thebusbar system and for the back-up protectionof the feeder protections. In order to make theprotection operate selectively, the setting valuesare selected above the setting values of the feederrelays.

The overvoltage stage of the U2 module oper-ates as the overvoltage protection for motors,transformers and similar equipment connectedto the busbar system. The operation of the stagecan be given an inverse time characteristic, inwhich case the use of curve B allows a relativelyhigh starting value to be set, without causingtoo long a tripping time at high overvoltages.

The undervoltage stage of module U2 opens thecircuit-breakers of the motors connected to thebusbar system, and so the motors are preventedfrom starting simultaneously when the voltagereturns. To avoid motor trippings at short volt-age interruptions, the operating time of theundervoltage stage is to be longer than the deadtime of an auto-reclose sequence.

To prevent unnecessary tripping of the under-voltage protection at tripping of a miniaturecircuit-breaker, a blocking voltage is applied onthe relay, over the auxiliary contact of the mini-ature circuit-breaker. Then switch 5 of switch-group SGB on the PC board of the overvoltageand under voltage module must be in the posi-tion 1.

Output relay A operates as the tripping relay ofthe circuit-breaker of the incoming cubicle. Therelay is controlled by the higher stage of the re-sidual voltage relay by means of switch SGR/4and by the overvoltage protection by means ofswitch SGR/1. Output relay B provides an alarmsignal when tripping has been caused by earth-fault, and output C provides an alarm signal attripping due to overvoltage and starting of theovervoltage stage, switch SGR/7. Output relayD is used for disconnecting motors in an under-voltage situation and output relay E for releas-ing the earth-fault relays of the feeders.

Analysis ofdisturbances

The data stored in the registers of the measur-ing modules provides useful information aboutthe behaviour of the network both in a normalservice situation and at disturbances.

The registers 2 and 4 of the overvoltage/under-voltage module SPCU 1 C1 show the normalfluctuation range of the busbar voltage. Regis-ters 5 and 6 show the frequency of the occur-rence of a large voltage fluctuation, that is howoften the voltage relay module has started.

The information stored in the registers 1 and 3,and 7 and 8 contributes to the analysis of thesituation at a disturbance. Information aboutthe voltage level occurring in a fault situationand how close to tripping the voltage relay wasis recorded in the registers.

A general view of the situation when an earth-fault occurs in a substation is provided by theregisters of the residual voltage module SPCU

1C6. Registers 2 and 3 show the number ofstartings of the different stages and, further, thedistribution of the earth-faults with regard tothe fault resistances.

The smallest fault resistance, at which the earth-fault is extinguished by itself or due to auto-reclose functions may be determined on the basisof the information in register 1. By using thelower stage of the residual voltage module for asignalling function and by setting the operat-ing time at the same value as the delay for thefinal tripping of the feeder earth-fault relay thefault resistance of the fault that caused trippingcan be determined by means of register 1, asthe total earth-fault current of the galvanicallyconnected network is known.

Data on the duration of the earth-fault or the safetymargin for the time gradings of the selective pro-tections is received from registers 4 and 5.

22

When the overvoltage, undervoltage and re-sidual voltage relay SPAU 320 C is operatingunder the conditions specified in "Technicaldata", the relay requires practically no mainte-nance. The voltage relay includes no parts orcomponents that are sensitive to physical or elec-trical wear under normal operating conditions.

Should the temperature and humidity at theoperating site differ from the values specified,or the atmosphere contain chemically activegases or dust, the relay should be visually in-spected in association with the secondary test-ing of the relay. This visual inspection shouldfocus on:

- Signs of mechanical damage to relay case andterminals

- Collection of dust inside the relay case; removewith compressed air

- Signs of corrosion on terminals, case or insidethe relay

Maintenanceand repair

If the relay malfunctions or the operating val-ues differ from those specified, the relay shouldbe overhauled. Minor measures can be taken bythe customer but any major repair involving theelectronics has to be carried out by the manu-facturer. Please contact the manufacturer or hisnearest representative for further informationabout checking, overhaul and recalibration ofthe relay.

The protection relay contains circuits sensitiveto electrostatic discharge. If you have to with-draw a relay module, ensure that you are at thesame potential as the module, for instance, bytouching the case.

Note!Protective relays are measuring instruments andshould be handled with care and protectedagainst moisture and mechanical stress, espe-cially during transport.

Spare parts Residual overvoltage relay module SPCU 1C6Over- and undervoltage relay module SPCU 1C1Power supply modules- Uaux = 80...265 V ac/dc (operative range) SPGU 240 A1- Uaux = 18...80 V dc (operative range) SPGU 48 B2Output relay module SPTR 6B3Interface module SPTE 4B9Bus connection module SPA-ZC 17_ or SPA-ZC 21_

Deliveryalternatives

Type Equipment SPCU SPCU SPCU1C6 1C1 1C1

SPAU 320 C Basic version, all relay modules included x x x

SPAU 320 C1 One residual overvoltage and one over- and under- x xvoltage relay module included

SPAU 320 C3 Only one residual overvoltage relay module xincluded

SPAU 320 C4 Two over- and undervoltage relay modules x xincluded

SPAU 320 C5 Only one over- and undervoltage relay module xincluded

23

Dimensiondrawingsand mounting

The basic model of the protection relay case isdesigned for flush-mounting. When required,the mounting depth of the case can be reducedby using raising frames: type SPA-ZX 301 re-duces the depth by 40 mm, type SPA-ZX 302

by 80 mm and type SPA-ZX 303 by 120 mm.When projecting mounting is preferred a relaycase type SPA-ZX 306 is used. The relay casefor projecting mounting is provided with frontconnectors.

Example1. Number and type designation 5 pcs SPAU 320 C2. Rated frequency fn = 50 Hz3. Auxiliary voltage Uaux = 110 V dc4. Accessories 5 raising frames SPA-ZX 301

5 bus connection modules SPA-ZC 17 MM2A5. Special requirements –

Orderinginformation

The relay case is made of profile aluminium andfinished in beige.

The rubber gasket fitted to the mounting collarprovides an IP54 degree of protection by enclo-sure between the relay case and the mountingbase.

The hinged cover of the case is made of trans-parent, UV-stabilized polycarbonate polymerand provided with two sealable locking screws.The rubber gasket of the cover provides an IP54degree of protection between the case and thecover.

The required input and output connections aremade to the multi-pole terminal blocks on the

rear panel. Each screw terminal is dimensionedfor one or two wires of maximum 2.5 mm2. Aconnection diagram adjacent to the terminalblocks illustrates the connection of the termi-nals.

The 9-pole D-type connector is intended forserial communication of the relay. A 25-pole D-type connector is used for connecting the dis-turbance recorder module via the RS 232 C porton the front panel to an output device.

The bus connection modules (SPA-ZC 17_ orSPA-ZC 21_) and fibre-optic cables recom-mended by the manufacturer should always beused for the serial communication.

Fig. 11. Dimension and mounting drawings for overvoltage, undervoltage and residual voltagerelay SPAU 320 C.

Raising frame

SPA-ZX 301SPA-ZX 302SPA-ZX 303

219179139

74114154

a b

226

162

136

229

293259

3034

a b

Panel cut-out

214 ±1

139

±1

IRF

1310

[ ]s>t

0.5

0.05 1.0

50

10

0.5

0.05 1.0

2

10

20

STEP

RESET

SG1

0 1

12345678

>U >>U

SPCU 1C6

B

>>

[ ]s>>t

U o

nU>U o

nUUo 80

o o

[ ]%

[ ]%

U

STEP

SPCU 1C6Residual overvoltage relay module


2

SPCU 1C6Residual overvoltage

relay module

Contents Features .......................................................................................................................... 2Description of operation ................................................................................................. 3Block diagram................................................................................................................. 4Front panel ..................................................................................................................... 5Operation indicators ....................................................................................................... 5Settings ........................................................................................................................... 6Selector switches ............................................................................................................. 6Measured data................................................................................................................. 7Recorded information ..................................................................................................... 8Menu chart ..................................................................................................................... 9Technical data ............................................................................................................... 10Serial communication parameters ................................................................................. 11

Event codes .............................................................................................................. 11Data to be transferred over the serial bus ................................................................. 12

Fault codes .................................................................................................................... 15

Features Low-set residual overvoltage stage U0> withdefinite time operation characteristic, settingranges 2...20% x Un and 10...100% x Un

High-set residual overvoltage stage U0>> withdefinite time operation characteristic, settingranges 10...80% x Un or 2...16% x Un

The operation of the high-set residual over-voltage stage can be set out of function by se-lecting the setting ∞, infinitive

Effective suppression of harmonics of the inputenergizing voltages

Local display of measured and set values as wellas data recorded at the moment of a relay op-eration

Flexible selection of special operational featuresfor particular applications

Continuous self-supervision of hardware andsoftware. At a permanent fault the alarm out-put relay picks up and the other outputs areblocked.

1MRS 750509-MUM EN

Issued 96-12-02Version A (replaces 34 SPCU 2 EN1)Checked L-W UApproved TK


3

Description ofoperation

The residual overvoltage relay module typeSPCU 1C6 is used in a variety of different pro-tection relay units where it constitutes a non-directional general earth-fault protection mod-ule which measures the residual voltage of theelectrical power system.

The residual overvoltage module contains twoovervoltage stages,that is a low-set stage U0> anda high-set stage U0>>.

The low-set or high-set voltage stage starts ifthe measured voltage exceeds the set start valueof the stage concerned. When starting, the con-cerned stage delivers a starting signal SS1 or SS2and simultaneously the operation indicator ofthe stage is lit with yellow colour. If the over-voltage situation lasts long enough to exceed theset operation delay, the stage that started alsooperates generating a trip signal, TS1 alt. TS2.The operation indicator of the stage that oper-ated turns red. The start and operation indica-tors are provided with memory control, whichmeans that they can be given the self-reset orthe latching mode of operation. The latchingindicators are reset with the RESET push-but-ton on the front panel or by means of the com-mand V101 or V102 via the serial port.

The tripping of the low-set overvoltage stageU0> can be blocked by routing a blocking sig-nal BTS1 to the low-set stage. Similarly, the trip-ping of the high-set stage U0>> is blocked by ablocking signal BTS2. The blocking signals arerouted by means of switchgroup SGB on thePC board of the relay module.

The setting range of the operation time t> ofthe low-set overvoltage stage U0> is selected withswitches SG1/1 and SG1/2. Three setting rangesare available.

Switches SG1/7 and SG1/8 are used for select-ing the setting range for the operation time t>>of the high-set stage U0>>. Three setting rangesare available.

The setting range of the start value of the low-set stage U0> is selected with switch SG1/5. Twosetting ranges are available, that is 2...20% x Unand 10...100% x Un.

The setting range of the start value of the high-set stage U0>> is selected with switch SG1/6. Twosetting ranges are available, that is 2...16% x Unor 10...80% x Un.

The operation of the two operating stages isprovided with a so called latching facility, whichmeans that the operation output is kept alerted,although the signal which caused the operationdisappears. The latching function is selectedwith switch SG1/4. The latched output and theoutput relay can be reset in three different ways;(i) by pressing push buttons STEP and RESETsimultaneously, (ii) via the serial inter-face us-ing the command V101 or (iii) via the serialinterface using the command V102. When al-ternative (ii) is used all recorded information ismaintained but if the alternatives (i) or (iii) isused the recorded information is erased.

The residual voltage signal input is providedwith an effective filter by means of whichhamonics of the measured residual voltage issuppressed, see Fig. 1.

dB 10

0

-10

-20

-30

-40

-50

-600 1 2 3 4 5 6 7 f / fn

Fig. 1. Filter characteristics of the residual volt-age input circuit.

4

Block diagram

Fig. 2. Block schematic diagram of the residual overvoltage relay module SPCU 1C6.

U0 Measured residual voltageBS1, BS2, BS3 Incoming external blocking signalsBTS1 Blocking of tripping of stage U0>BTS2 Blocking of tripping of stage U0>>SG1 Selector switchgroup on the relay module front panelSG2 Function selector switchgroup for the operation indicatorsSGB Selector switchgroup on the PC board for blocking signalsSS1 Start signal of stage U0>TS1 Trip signal of stage U0>SS2 Start signal of stage U0>>TS2 Trip signal of stage U0>>Y Yellow indicator, startingR Red indicator, tripping

NOTE!All input and output signals of the relay mod-ule are not necessarily wired to the terminals ofevery protection relay unit utilizing this mod-

ule. The signals wired to the terminals are shownin the signal diagram in the manual of the con-cerned protection relay unit.

5

Front panel

Voltage measurement indicator

Start voltage setting knoband indicator of stage U0>

Operation time setting knoband indicator of stage U0>

Start voltage setting knob andindicator of stage U0>>

Operation time setting knoband indicator of stage U0>>

IRF

1310

[ ]s>t

0.5

0.05 1.0

50

10

0.5

0.05 1.0

2

10

20

STEP

RESET

SG1

0 1

12345678

>U >>U

SPCU 1C6

B

>>

[ ]s>>t

U o

nU>U o

nUUo 80

o o

[ ]%

[ ]%

U

STEP

Simplified device symbol

Self-supervision alarmindicator

Display for set andmeasured values

Display step push-button

Selector switchgroup

Switchgroup indicator

Reset push-button

Operation indicators

Relay module typedesignation

Fig. 3. Front panel of the residual overvoltage relay module SPCU 1C6.

Operationindicators

Both voltage stages have their own yellow/redLED indicators. Yellow light indicates startingof the concerned overvoltage stage and red lightindicates that the overvoltage stage has operated.

The four LED indicators can, independently ofone another, be given a non-latching or a latch-ing mode of operation. The latching modemeans that the indicator remains lit after beingswitched on, although the overvoltage stage,which controls the indicator, resets. If, for in-stance, the yellow start indicator is given thelatching mode and the red indicator the non-latching mode, the yellow indicator is lit, whenthe stage starts, which then turns red if and whenthe stage operates. When the overvoltage stageresets only the yellow indicator remains lit. Theindicators, which have been given the latchingmode, are reset locally by pushing the RESETpush-button or by remote control over the SPAbus using the command V102.

An unreset operation indicator does not affectthe protective functions of the relay module.

The self-supervision alarm indicator IRF indi-cates that the self-supervision system has de-tected a permanent internal relay fault. The in-dicator is lit with red light shortly after the faulthas been detected. At the same time the relaymodule puts forward a control signal to the self-supervision system output relay of the protec-tion relay unit.

Additionally, in most fault cases, a fault codeshowing the nature of the fault appears on thedisplay of the module. The fault code, consist-ing of a red number one (1) and a green three-digit code number, indicates what type of in-ternal fault that has been detected. When a faultmessage appears, the fault code should be noteddown for later use when relay overhaul or re-pair is to be carried out.

6

Settings The setting values are shown by the threerightmost digits of the display. A LED indica-

tor below the setting knob shows, when lit,which setting value is presented on the display.

U0>/Un Start voltage value of the U0> stage, expressed as a percentage of the rated voltageof the energizing input used. The setting range is 2...20% x Un when SG1/5 = 0,and 10...100% x Un when SG1/5 = 1.

t> [s] Operate time of the U0> stage, expressed in seconds. The setting range is deter-mined by the position of switches SG1/1 and SG1/2. Selectable operate time set-ting ranges 0.05...1.00 s, 0.5...10.0 s and 5...100 s.

U0>>/Un Start voltage value of the U0>> stage, expressed as a percentage of the rated voltageof the energizing input used. The setting range is 10...80% x Un when SG1/6 = 0,and 2...16% x Un when SG1/6 = 1. The setting ∞, infinite, (displayed as - - -) setsthe high-set stage U0>> out of operation.

t>> [s] Operate time of the U0>> stage, expressed in seconds. The required setting range,0.05...1.00 s, 0.5...10.0 s or 5.00...100 s, is selected with switches SG1/7 andSG1/8.

Further, the checksum of the selector switch-group SG1 is shown on the display when theLED indicator below the switchgroup is lit. Bymeans of the displayed checksum and thechecksum manually calculated the proper op-

eration of the switchgroup SG1 can be verified.An example of how the checksum is calculatedis shown in the manual "General characteristicsof C type relay modules".

Selector switches Additional functions required by individualapplications are selected by means of the func-tion selector switches of switchgroup SG1 lo-cated on the front panel. The numbering of the

switches, 1...8, as well as the switch positions 0and 1 are marked on the relay module frontpanel.

Switch Function

SG1/1 Selection of setting range for the operate time t> of low-set stage U0>.SG1/2

SG1/1 SG1/2 Operate time t>

0 0 0.05...1.00 s1 0 0.5...10.0 s0 1 0.5...10.0 s1 1 5...100 s

SG1/3 Not in use. Has to be set in position 0.

SG1/4 Selection of latching function for the tripping signals TS1 and TS2.

When SG1/4 = 0, the trip signals reset to the initial state (= the output relay drops off ),when the measuring signal causing the operation falls below the set start voltage level.When SG1/4 = 1, the trip signals remain activated (= the output relay remains pickedup), although the measuring signal falls below the set start voltage level. Then the tripsignals are reset by pressing the push-buttons STEP and RESET simultaneously orwith the commands V101 or V102 via the serial port.

SG1/5 Selection of setting range for the start voltage value of the low-set stage U0>.

When SG1/5 = 0, the setting range is 2...20% x Un.When SG1/5 = 1, the setting range is 10...100% x Un.

7

Switch Function

SG1/6 Selection of setting range for the start voltage value of the high-set stage U0>>.

When SG1/6 = 0, the setting range is 10...80% x Un and ∞, infinite.When SG1/6 = 1, the setting range is 2...16% x Un and ∞, infinite.

SG1/7 Selection of setting range for the operate time t>> of the high-set stage U0>>.SG1/8

SG1/7 SG1/8 Operate time t>>

0 0 0.05...1.00 s1 0 0.5...10.0 s0 1 0.5...10.0 s1 1 5...100 s

Switchgroup SG2 is a so called software switch-group, which is located in the third submenuof switchgroup SG1. The mode of operation,i.e. self-reset or manually reset, of the LED in-dicators U0> and U0>> is determined by theswitches of switchgroup SG2. The mode of op-

eration can be separately set for each indicator.The mode of operation is set by means of thechecksum, which can be calculated from thefollowing table. Normally the start indicationsare self-reset and the operation indicationsmanually reset.

Indicator Manually reset Factory default

Start indicator U0> 1 0Operation indicator U0> 2 2Start indicator U0>> 4 0Operation indicator U0>> 8 8

Checksum 15 10

The PC board of the relay module contains aswitchgroup SGB including switches 1...8. Theswitches 1...3 are used for selecting the startingsignals, whereas switches 4...8 are used for rout-ing the blocking signals to the voltage module

in various protection relay units. Instructionsfor setting of switchgroup SGB are given in theuser's manual of the different protection relayunits.

Measured data The measured values are displayed by the threerightmost digits on the display. The measured

data to be displayed are indicated by a lit LEDindicator.

Indicator Measured data

U0 Residual voltage measured by the relay module, expressed as a percentage of therated voltage of the energizing input used.

8

Recordedinformation

The leftmost red digit displays the addressnumber of the register, the rightmost three greendigits display the recorded data.

Register/ Recorded dataSTEP

1 Maximum residual voltage measured by the module, as a percentage of the ratedvoltage Un of the used energizing input. If the module operates, the voltage value atthe moment of operation is stored in the memory. Any new operation erases the oldvalue and updates the register with the new value. The same thing happens if themeasured voltage exceeds a previously recorded maximum value.

2 Number of starts of the low-set overvoltage stage U0>, n (U0>) = 0...255.

3 Number of starts of the high-set overvoltage stage U0>>, n (U0>>) = 0...255.

4 Duration of the latest start situation of stage U0> as a percentage of the set operatetime t>. Any new start resets the counter, which then starts counting from zero.When the stage has operated, the counter reading is 100.

5 Duration of the latest start situation of stage U0>> as a percentage of the set operatetime t>>. Any new start resets the counter, which then starts recounting from zero.When the stage has operated, the counter reading is 100.

0 Display of blocking signals and other external control signals. The rightmost digitindicates the state of the blocking inputs of the relay module. The following statesmay be indicated:0 = no blockings1 = operation of the U0> stage blocked2 = operation of the U0>> stage blocked3 = operation of both stages blocked

In this register the second digit from he right is constantly zero. The leftmost digitindicates the state of the remote reset control input, if applicable. The followingstates may be indicated:0 = remote reset control input not energized1 = remote reset control input energized

From this register it is possible to move on to the TEST mode, where the start andoperation signals of the module can be activated one by one. For further details seemanual "General characteristics of C type relay modules".

A The address code of the protection relay module in the serial communication sys-tem. The serial communication is broken if the relay module is given the addresscode 0 (zero). Register A is provided with the following subregisters:1. Selection of data transfer rate for the serial communication. Selectable values

300, 1200, 2400, 4800 and 9600 Bd. Default value 9600 Bd.2. Bus communication monitor. If the relay module is connected to a serial com-

munication system and the serial communication system is in operation the coun-ter of the bus communication monitor will show the value 0 (zero). If the com-munication is broken the numbers 0…255 are scrolling in the counter.

3. Password required when changing relay module settings via remote control

Registers 1...5 are set to zero by pressing thepush buttons STEP and RESET simultaneouslyor by remote control using the command V102.The register values are also erased if the auxil-iary power supply of the module is interrupted.The address code of the relay module, the set

data transfer rate of the serial communicationand the password are not erased by a supplyvoltage interruption. Instructions for setting theaddress code and the data transfer rate are givenin the manual "General characteristics of C typerelay modules".

9

Menu chart

Display off. Normal state SUBMENUFORWARD STEP 1 sBACKWARD STEP 0.5 s

MAIN MENU

STEP

BACKWARD

.5s

STEP FORWARD

1s

MAIN MENU SUBMENU

STEP 0.5 s RESET 1 s

0 000 SS1 TS1 TS2IRF SS2

Residual voltage U

Remotely setpercentage p1

Alerted start voltage, stage

Remotely set startvoltage x p1


Alerted operation time t>, stage

Remotely set ope-ration time t> x p2


Alerted start voltage, stage

Remotely set start voltage x p3


Alerted operation time t>>, stage

Remotely set ope-ration time t>> x p4

Alerted checksum,switchgroup SG1

Remotely set checksum of SG1

Remotely set checksum of SG1

Chechsumof SG2

Recorded maximum value of the residual voltage

Number of starts of the residual voltage stage

Number of starts of the residual voltage stage

Duration of the latest start event stage

1

2

3

4

Duration of the latest start event of stage 5

Incoming blocking signals0

Relay module address code

Data transfer rate (Bd)

Bus communication monitor 0 ... 255 Password A

= Value that can be set in the setting mode0

U >0

U >>0

U >0

U >>0

U 0

U >0

U >>0

U >0

U >>0

U >>0

U >0

Fig. 4. Main menu and submenus of the residual overvoltage relay module SPCU 1C6.

The procedure for entering a submenu or a set-ting mode and configuring the module is de-

scribed in detail in "General characteristics ofC type relay modules".

10

Technical data Low-set overvoltage stage U0>Start voltage U0> 2...20% x Un or 10...100% x UnStart time, typically 70 msOperate time 0.05...1.00 s, 0.5...10.0 s or 5...100 sReset time <100 msDrop-off/pick-up ratio, typically 0.96Operate time accuracy ±2% of set value or ±40 msOperation accuracy- 10...100% x Un ±3% of set value- 2...20% x Un ±5% of set value

High-set overvoltage stage U0>>Start voltage U0>> 10...80% x Un and ∞, infinite or

2...16% x Un and ∞, infiniteStart time, typically 70 msOperate time 0.05...1.00 s, 0.5...10.0 s or 5...100 sReset time <100 msDrop-off/pick-up ratio, typically 0.96Operate time accuracy ±2% of set value or ±40 msOperation accuracy- 10...80% x Un ±3% of set value- 2...16% x Un ±5% of set value

11

Serialcommunicationparameters

Event codes

The substation level control data communica-tor is able to read, over the SPA serial bus, theevent messages of the relay module, e.g. startand trip messages, from the residual overvoltagerelay module SPCU 1C6. The events can beprinted out in the format: time (ss.sss) and eventcode. The event codes of the relay module areE1...E8 , E50 and E51. Additional event codesrelating to the data communication are gener-ated by the data communication equipment.

The event codes E1...E8 and the events repre-sented by these can be included in or excludedfrom the event reporting by writing, via the SPAbus, an event mask (V155) to the relay module.The event mask is a binary number coded to adecimal number. The event codes E1...E8 arerepresented by the numbers 1, 2, 4...128. The

event mask is formed by multiplying the abovenumbers either with 0, event not included or 1,event included in reporting and by adding theproducts, see instructions for checksum calcu-lation.

The event mask may take a value within therange 0...255. The default value of the residualovervoltage relay module SPCU 1C6 is 85,which means that any start or operation eventis included in the reporting, but no resettings.The event codes E50...E54 and the events rep-resented by these cannot be excluded from thereporting.

Event codes of residual voltage relay moduleSPCU 1C6:

Code Event Weighting Defaultcoefficient setting

E1 Starting of stage U0> 1 1E2 Starting of stage U0> reset 2 0E3 Tripping of stage U0> 4 1E4 Operation of stage U0> reset 8 0E5 Starting of stage U0>> 16 1E6 Starting of stage U0>> reset 32 0E7 Tripping of stage U0>> 64 1E8 Operation of stage U0>> reset 128 0

Default value of event mask V155 85

E50 Restart of microprocessor * -E51 Overflow of event register * -E52 Temporary interruption in the data communication * -E53 No response from the relay module over the data

communication bus * -E54 The relay module responds again over the data

communication bus * -

0 not included in the event reporting1 included in the event reporting* no code number, always included in event reporting- cannot be set

NOTE!In the SPACOM system the event codes E52...E54 are generated by the station level controldata communicator, e.g. type SRIO 1000M.

12

Data to betransferred overthe serial bus

In addition to the event code data transfer, theinput data (I data), output data (O data), set-ting values (S), memorized data (V data) andsome other data can be read from the relay

module over the serial communication bus.Further, part of the data can be changed overthe SPA bus by separate commands. All datainformation is available in channel 0.

Data Code Data Valuesdirect.

Input data

Energizing input voltage I1 R 0...250% x UnBlocking of operation of stage U0> I2 R 0 = no blocking

1 = operation of stage U0>blocked

Blocking of operation of stage U0>> I3 R 0 = no blocking1 = operation of stage I0>>

blocked

Output data

Starting of stage U0> O1 R 0 = stage U0> not started1 = stage U0> started

Operation of stage U0> O2 R 0 = stage U0> not tripped1 = stage U0> tripped

Starting of stage Uo>> O3 R 0 = stage U0>> not started1 = stage U0>> started

Operation of stage U0>> O4 R 0 = stage U0>> not tripped1 = stage U0>> tripped

Setting values

Alerted start value of stage U0> S1 R 2...100% x UnAlerted operate time of stage U0> S2 R 0.05...100 sAlerted start value of stage U0>> S3 R 2...80% x Un

999 = ∞, infiniteAlerted operate time of stage U0>> S4 R 0.05...100 sAlerted checksum of switchgroup SG1 S5 R 0...255

Start value of stage U0>, S11 R 2...100% x Unset with the setting knobOperate time of stage U0>, S12 R 0.05...100 sset with the setting knobStart value of stage U0>>, S13 R 2...80% x Unset with the setting knob 999 = ∞, infiniteOperate time of stage U0>>, S14 R 0.05...100 sset with the setting knobChecksum of switchgroup SG1, S15 R 0...255set with the switches

Remotely setting percentage of the S21 R, W 0...999%start value of stage U0>Remotely setting percentage of the operate S22 R, W 0...999%time of stage U0> or time multiplierRemotely set percentage for the S23 R, W 0...999%start value of stage U0>>Remotely setting percentage for the S24 R, W 0...999%operate time of stage U0>>Remotely set checksum of switchgroup SG1 S25 R, W 0...255

13


Remotely set start value of stage U0> S31 R 2...100% x UnRemotely set operate time of stage U0> S32 R 0.05...100 sRemotely set start value of stage U0>> S33 R 2...80% x Un

999 = ∞, infiniteRemotely set operate time of stage U0>> S34 R 0.05...100 sRemotely set checksum of switchgroup SG1 S35 R 0...255

Max. measured voltage or voltage V1 R 0...250% x Unat operationNumber of starts of stage U0> V2 R 0...255Number of starts of stage U0>> V3 R 0...255Duration of the latest start V4 R 0...100%situation of stage U0>Duration of the latest start V5 R 0...100%situation of stage U0>>

Resetting of output relays and V101 W 1 = output relays andoperation indicators operation indicators resetResetting of output relays and operation V102 W 1 = output relays andindicators and erasing of recorded data operation indicators

reset and registers(codes V1…V5) erased

Remote control of settings V150 R, W 0 = setting with knobsS11...S15 activated

1 = remote settingsS31...S35 activated

Event mask word V155 R, W 0...255, see section"Event codes"

Manual reset or self-reset mode of V156 R, W 0…15, see sectionoperation of the LED indicators "Selector switches"

Opening of password for remote settings V160 W 1...999Changing or closing of password V161 W 0...999for remote settings

Activation of self-supervision function V165 W 1 = self-supervision outputis activated and the IRFindicator turns on inabout 5 seconds, where-after the self-supervisionsystem and the IRFindicator reset

Internal fault code V169 R 0…255

Data communication address of V200 R 1...254the relay module

Program version V205 R 070_

14


Type designation of the relay module F R SPCU 1C6

Reading of event register L R Time, channel numberand event code

Re-reading of event register B R Time, channel numberand event code

Reading of module status data C R 0 = normal state1 = module been subject

to automatic reset2 = overflow of event register3 = events 1 and 2 together

Resetting of module status data C W 0 = resetting

Time reading or setting T R, W 00.000...59.999 s

R = data to be read from the moduleW = data to be written to the module

The data transfer codes L, B, C and T have beenreserved for the event data transfer between therelay module and the control data communi-cator.

The event register can be read by the L com-mand only once. Should a fault occur, for ex-ample, in the data transfer, it is possible, by us-ing the B command, to re-read the contents ofthe event register once already read by means ofthe L command. When required, the B com-mand can be repeated.

The setting values S1...S5 are the alerted setvalues currently used by the protection relaymodule. These values are set either by remotecontrol or by means of the setting knobs. Thevalues S11...S15 are set with the setting knobsand the selector switches. Variables S21...S25are set as percentage values via remote control.

The settings S21...S25 allow reading or writ-ing. A condition for writing is that the pass-word V160, for remote setting has been opened.The variables S31...S35 contain the remote set-ting values.

When the values of the variables S21...S24 areto be changed, the variables can be given a per-centage factor within the range 0...999. It ispossible to alter a setting value beyond the set-ting ranges specified in the technical data of therelay module. However, the validity of the set-ting values are guaranteed only within the set-ting ranges specified in the technical data.

Activation of the self-supervision function(V165) prevents the relay module from operat-ing as long as the self-supervision output is ac-tivated and the IRF indicator is lit.

15

Fault codes Once the self-supervision system has detected apermanent relay fault, the IRF LED on the frontpanel of the module is lit, and at the same timethe normally operated signal relay of the self-supervision system drops off.

In most fault situations an auto-diagnostic faultcode is shown on the relay display. The faultcode cannot be reset. The fault code consists of

a red digit one (1) and a green code numberthat indicates the fault type. The fault codeshould be recorded and stated when service isordered.

The fault codes of the residual overvoltage relaymodule SPCU 1C6 are explained in the follow-ing table:

Fault code Explanation

4 Faulty output relay path or missing output relay card30 Faulty program memory (ROM)50 Faulty working memory (RAM)

195 Too low a value in reference channel with multiplier 1131 Too low a value in reference channel with multiplier 5

67 Too low a value in reference channel with multiplier 25203 Too high a value in reference channel with multiplier 1139 Too high a value in reference channel with multiplier 5

75 Too high a value in reference channel with multiplier 25253 No interruptions from the A/D-converter

IRF

>U

U

1316

[ ]sk

>t0.5

0.05 1.0

0.8

0.4

0.5

0.1 1.0

0.8

1.2

1.6

STEP

RESET

SG1

0 1

12345678

U

>U 

nU<U

1.2

[ ]sk

<t<

STEP

SPCU 1C1Combined overvoltage and undervoltagerelay module


2

SPCU 1C1Combined overvoltage

and undervoltagerelay module

Contents Features .......................................................................................................................... 2Description of function .................................................................................................. 3Block diagram................................................................................................................. 4Front panel ..................................................................................................................... 5Start and operation indicators ......................................................................................... 5Settings ........................................................................................................................... 6Selector switches ............................................................................................................. 6Measured data ................................................................................................................ 8Recorded information ..................................................................................................... 8Register menu chart ...................................................................................................... 10Voltage/time characteristic ............................................................................................ 11Technical data .............................................................................................................. 13Event codes ................................................................................................................... 14Remote transfer data ..................................................................................................... 15Fault codes .................................................................................................................... 18

Features Single-phase voltage measuring protection relaymodule

Overvoltage stage with definite time or inversedefinite minimum time operation characteristic

Undervoltage stage with definite time or inversedefinite minimum time operation characteristic

Two sets of voltage/time curves available atinverse time operation characteristic of the un-dervoltage stage

External blocking of the operation of the under-voltage stage via a built-in control input

Automatic blocking of the undervoltage stageon loss of energizing voltage

Digital display of measured values, set valuesand recorded fault values

Serial communication capability for extensiveexchange of data with substation level equip-ment

Continuous self-supervision of hardware andsoftware for enhanced reliability and availability

Auto-diagnostic fault codes generated by themodule on detection of a permanent internalfault

1MRS 750609-MUM EN

Issued 97-01-10Modified 99-12-20Version C (replaces 34 SPCU 3 EN1)Checked KJApproved TK


3

The combined overvoltage and undervoltagerelay module SPCU 1C1 contains an over-voltage stage and an undervoltage stage. Theovervoltage stage and the undervoltage stage canbe given either definite time or inverse timecharacteristic.

If the voltage measured by the module exceedsthe set start value of the U> stage, the moduledelivers a start signal SS1 after the set start timehas expired. The start time of the U> stage isselected by means of switches SG1/1 and SG1/2,and four alternative values are available. Afterthe preset operate time t>, or at inverse timecharacteristic, after a time depending on thelevel of the overvoltage, the overvoltage stageoperates delivering a trip signal TS1.

The operation characteristic of the U> stage, i.e.definite time or inverse time characteristic, isselected with switch SG1/3. At definite timecharacteristic the setting range of the operatetime is selected with switches SG1/4. At inversetime characteristic two different sets of voltage/time curves, called A and B, can be selected withswitch SG1/4.

If the voltage measured by the module fallsbelow the set start value of the U< stage, themodule delivers a start signal SS2 after the setoperate time has expired. The start time of theU< stage is selected by means of switch SG1/8,and two alternative values are available. Afterthe preset operate time t<,or at inverse timecharacteristic, after a time depending on thelevel of the undervoltage, the undervoltage stageoperates delivering a trip signal TS2.

The operation characteristic of the U< stage, i.e.definite time or inverse time characteristic, isselected with switch SG1/7. At definite timecharacteristic the setting range of the operatingtime is selected with switch SG1/6. At inversetime characteristic one set of voltage/time curve,called C, is available.

To avoid unwanted operations, for instanceduring an auto-reclose sequence, starting andtripping of the undervoltage stage can be blockedby turning switch SG1/5 into the position 1.The blocking function is activated if the meas-ured signal falls below 0.2 x Un. This functionis illustrated in Fig. 1.

Descriptionof function

Fig. 1. Operation of the combined overvoltage and undervoltage relay module SPCU 1C1 whenthe function of the undervoltage stage is internally blocked (SG1/5 = 1).

Tripping (TS2) of the U< stage alone, may beblocked by routing a blocking signal BTS2 tothe undervoltage stage. The blockings areconfigured individually for the different protec-tion relays by means of the switchgroup SGB on

the PC board of the relay module. Instructionsfor setting the SGB switchgroup are given in theuser's manual of the concerned protection relay.Also see the signal diagram of the concernedprotection relay.

4

Block diagram

Fig. 2. Block diagram for the overvoltage and undervoltage relay module SPCU 1C1

U Measured voltageBS1, BS2, BS3 Blocking signalsBTS2 Blocking of the tripping of the U< stageSG1 Front panel selector switchgroupSG2 Software selector switchgroup for defining the mode of function of the

start and operation indicatorsSGB Selector switchgroup for configuration of blockings (on the PC-board)SS1 Start signal of the U> stageTS1 Trip signal of the U> stageSS2 Start signal of the U< stageTS2 Trip signal of the U< stageY Yellow indicatorR Red indicator

NOTE!All input and output signals of the relay moduleare not necessarily wired to the terminals of eachprotection relay including the overvoltage andundervoltage relay module. The signals wired

to the terminals are shown in the signal diagramof the concerned protection relay, see user'smanual for the concerned protection relay.

5

Front panel

IRF

>U

U

1316

[ ]sk

>t0.5

0.05 1.0

0.8

0.4

0.5

0.1 1.0

0.8

1.2

1.6

STEP

RESET

SG1

0 1

12345678

U

>U 

nU

Setting knob and indicatorfor operate time or timemultiplier k> of stage U>

Setting knob and indicatorfor starting value of stage U<

Setting knob and indicatorfor operate time or timemultiplier k< of stage U<

Simplified device symbol

Self-supervision alarmindicator

Display

Display step push-button

Selector switchgroup SG1

Indicator for switchgroupSG1, SG2 and SG3

Reset push-button

Operation indicators

Type designationof relay module

Fig. 3. Front panel of the combined overvoltage and undervoltage relay module SPCU 1C1.

Each stage has its own yellow/red operationindicator. Yellow light indicates starting of theoperating stage and red light indicates that thestage has delivered a trip signal.

The four LED indicators can, independently ofone another, be given a self-reset or manual resetmode of operation by using switchgroup SG2.The manual reset mode means that the indica-tor remains lit after being switched on, althoughthe stage, which controls the indicator, resets. If,for instance, the yellow start indicator has beengiven self-reset mode of operation and the redoperation indicator manual-reset mode of op-eration, the yellow indicator is lit, when thestage starts and turns red if the stage operates.When the stage resets after operation the redindication remains lit. If the stage starts butresets before operation the yellow indicator is litduring starting and reset automatically whenthe stage resets. The indicators, which have beengiven the manual reset mode, are reset locally bypushing the RESET push-button on the front

panel or by remote control over the SPA bususing the command V101 or V102. See alsotable (for switchgroup SG3) on page 7 in chap-ter "Selector switches".

An unreset operation indicator does not affectthe protection functions of the relay module.The relay module is constantly operative, re-gardless of the indicators having been reset ornot.

The self-supervision alarm indicator IRF indi-cates that the self-supervision system has de-tected a permanent fault. The indicator is litwith red light shortly after a permanent internalfault has been detected. At the same time acontrol signal is put forward to the output relayof the self-supervision system. Additionally, inmost fault cases, a fault code indicating type offault appears on the display of the relay module.The fault code is to be recorded to facilitate thesubsequent fault location and repair actions.

Start andoperationindicators

6

lit, the setting value currently being shown onthe display.

U>/Un Start value of the U> stage as a multiple of the rated voltage of the relay energizing inputbeing used. Setting range 0.8...1.6 x Un

t> [s] Operate time of the U> stage, expressed in seconds, at definite time mode of operation.k> The required setting range, 0.05...1.00 s, 0.5...10.0 s, is selected with switch SG1/4.

At IDMT mode of operation the setting range of the multiplier k> is 0.05...1.00

U</Un Start value of the U< stage as a multiple of the rated voltage of the relay energizing inputbeing used. Setting range 0.4...1.2 x Un

t< [s] Operate time of the U< stage, expressed in seconds, at definite time mode of operation.k> The required setting range, 1...10 s, 10...100 s, is selected with switch SG1/6. At

IDMT mode of operation the setting range of the multiplier k< is 0.1...1.00

Settings The setting values are shown by the threerightmost green digits of the display. The LEDindicator below the setting knob shows, when

The checksum of the programming switch-group SG1 is indicated on the display when theindicator under the switchgroup is lit. In thisway a check can be made to prove that the

switches have been set and that they work prop-erly. An example of hoe the checksum is calcu-lated is given in the description "General char-acteristics of C-type relay modules".

of the module. The numbering of the switches,1...8, and the switch positions, 0 and 1, aremarked on the front panel.

Selector switches Additional relay functions required in variousapplications are selected with the selector switchesof switchgroup SG1 located on the front panel

Switch Functions to be selected

SG1/1 Start time for the overvoltage stage U>.SG1/2

SG1/1 SG1/2 Start time

0 0 0.1 s1 0 1 s0 1 10 s1 1 60 s

SG1/3 Definite time or inverse time operation characteristic for the U> stage. At definite timeSG1/4 characteristic switch SG1/4 is used for selecting the setting range of the operate time t>.

At inverse time operation switch SG1/4 is used for selecting the characteristic curve set.

SG1/3 SG1/4 Mode of operation Operate time t> orcharacteristic curve set

0 0 Definite time 0.05...1.00 s0 1 Definite time 0.5...10.0 s1 0 Inverse time Curve set A1 1 Inverse time Curve set B

SG1/5 Automatic blocking of starting and tripping of the undervoltage stage U<.

When SG1/5 = 0, the undervoltage stage operates once a measured voltage falls belowthe setting value.When SG1/5 = 1, starting and tripping of the undervoltage stage are blocked if themeasured voltage falls below 0.2 x Un.

This feature can be used for preventing unnecessary starts and trips during auto-reclose sequences.

7

Switch Functions to be selected

SG1/6 Definite time or inverse time operation characteristic for the U< stage. At definite timeSG1/7 characteristic switch SG1/6 is used for selecting the setting range of the operate time t<.

At inverse time operation switch SG1/6 is used for selecting the characteristic curve set.

SG1/6 SG1/7 Mode of operation Operate time t>or characteristic curve

0 0 Definite time 1...10 s1 0 Definite time 10...100 s0 1 Inverse time Curve set C1 1 Inverse time Curve set C

SG1/8 Start time selection for the undervoltage stage U<.

When SG1/8 = 0, the start time is 0.1 s.When SG1/8 = 1, the start time is 30 s.

Switchgroup SG2 is a so called software switch-goup, which is located in the third submenu ofchecksum register of switchgroup SG1. Themode of operation, i.e. self-reset or manuallyreset, of the LED indicators U> and U< isdetermined by the switches of switchgroup SG2.

The mode of operation can be separately set foreach indicator. The mode of operation is set bymeans of the checksum, which can be calculatedfrom the following table. Normally the startindications are self-reset and the operation indi-cations manually reset.

Indicator Manual reset mode Factory set User's settingsdefault value

Start indicator U> 1 0Operation indicator U> 2 2Start indicator U< 4 0Operation indicator U< 8 8

Checksum ∑ 15 10

Switchgroup SG3 is a so called software switch-group, which is located in the fourth submenuof switchgroup SG1. The front panel push-

buttons STEP and RESET can be programmedwith switch SG3/1. Switches SG3/2…8 are notin use. The default value for SG3 is 0.

SG3/1 Push-button Clear start/trip LED's Erase memorized values

STEP0 RESET x

STEP & RESET x x

STEP x1 RESET x

STEP & RESET x x

The PC board of the relay module contains aswitchgroup SGB with eight switches. Theswitches 1...3 are used for configuring the startsignals going from the module, whereas theswitches 5, 7 and 8 are used for configuring theblocking signals to be routed to the under-

voltage stage in different protection relays.Switches 4 and 6 have no function in the relaymodule SPCU 1C1. Instructions for configuringswitchgroup SGB are given in the user's manualof the different protection relays and in thesignal diagram of the user's manual.

8

Measured data The measured value is shown by the threerightmost green digits on the display. The data

currently being presented on the display areindicated by LED indicators on the front panel.

Indicator Measured quantity

U The voltage measured by the module, expressed as a multiple of the rated voltageof the relay energizing input.

Recordedinformation

The leftmost red digit displays the register ad-dress and the other three digits the recordedinformation.

Register/ Recorded informationSTEP

1 The highest voltage value measured during the start sequence as a multiple of therated voltage of the relay energizing input. Any overvoltage stage start erases the oldvalue and starts a new recording sequence. The recording sequence is stopped onoperation of the overvoltage stage and the highest value during the start sequence isfound in the register.

2 The highest voltage value measured as a multiple of the rated voltage of the relayenergizing input. The register value is updated as soon as the measured value exceedsthe value alredy in the register. Register 2 is erased with a command via the serial portor by pushing the STEP and RESET push-buttons simultaneously. The registeredvalue is also erased on loss of auxiliary supply.

3 The lowest voltage value measured during the start sequence as a multiple of the ratedvoltage of the relay energizing input. Any undervoltage stage start erases the old valueand starts a new recording sequence. The recording sequence is stopped on operationof the undervoltage stage and the lowest value during the start sequence is found inthe register.

4 The lowest voltage value measured as a multiple of the rated voltage of the relayenergizing input. The register value is updated as soon as the measured value fallsbelow the value already in the register. Register 4 is erased with a command via theserial port or by pushing the STEP and RESET push-buttons simultaneously. Theregistered value is also erased on loss of auxiliary supply.

5 Number of starts of the overvoltage stage, n (U>) = 0...255.

6 Number of starts of the undervoltage stage, n (U<) = 0...255.

7 Duration of the latest start event of the overvoltage stage, expressed as percentage ofthe set operate time t>, or, at IDMT mode of operation, of the calculated operatetime. A new start resets the counter which starts recounting from zero. If the stagehas tripped, the counter reading is 100.

8 Duration of the latest start event of the undervoltage stage, expressed as percentageof the set operate time t<, or, at IDMT mode of operation, of the calculated operatetime. A new start resets the counter which starts recounting from zero. If the stagehas tripped, the counter reading is 100.

9

Register/ Recorded informationSTEP

0 Display of blocking signals and other external control signals. The digit at theextreme right indicates the state of the blocking of the undervoltage stage.The following states are indicated:0 = no blockings2 = tripping of the undervoltage stage blocked

The middle digit of the register is always a zero. The leftmost green digit indicatesthe state of the remote reset input, if any.The following states are indicated:0 = remote reset control input not energized1 = remote reset control input energized

From this register it is possible to move to the TEST mode, where the start and tripsignals of the module can be activated one by one. For further details see thedescription "General characteristics of C type relay modules".

A Address code of the protection relay module, required by the serial communicationsystem.

Register A has three subregisters with the following contents:1) Selection of data transfer rate for the serial communication. Selectable values 300,

1200, 2400, 4800 or 9600 Bd. Default value 9600 Bd.2) Communication interruption counter. If the relay module is connected to a

communication system, which is in operation, the value of the communicationinterruption counter is 0 (zero). When disturbance occurs on the communicationsystem, the numbers 0…255 are scrolling in the communication interruptioncounter.

3) Password required for remote setting of relay module parameters.

When the display is dark the starting point ofthe display menu can be reached by pushing theSTEP push-button once.

The registers 1...8 are set to zero by pressing thepush-buttons STEP and RESET simultaneouslyor via the SPA bus with the command V102.The registers are also cleared if the auxiliarypower supply to the module is interrupted. Theaddress code of the relay module, the baud rate

of the serial communication and the passwordare not erased by a voltage failure. Instructionsfor setting the address and the baud rate aregiven in user's manual "General characteristicsof C type relay modules".

At the initial state when none of the stages hasstarted, the reading of register 1 is "000" andthat of register 3 is "– – –"

10

Registermenu chart

The figure below shows the menus and sub-menus of the combined overvoltage and under-voltage relay module SPCU 1C1.

Display off. Normal state

Voltage U measured

21

Remotely set value t< x p4 / k< x p4

21

Checksum of switchgroup SG1


1

Set start voltage U<

Set operate time t> or time multiplier k> of stage U>

SUBMENUSTEP FORWARD 1 sSTEP BACKWARD 0,5 s

MAI

N

MENU

STEP

BACKWARD

.5s

STEP

FORWARD

1s

MAIN MENU SUBMENU

STEP 0,5 s RESET 1 s

1

2

Set start voltage U>

2 Remotely setchecksum

1 Remotely setchecksum 3 Checksum of

switchgroup SG2

2

Remotely setvalue U< x p3

Remotely setvalue U> x p1




Max. voltage measured during the last start of U>1

Max. voltage measured after reset2

3

Remotely set value t> x p2 / k> x p2

Duration of the latest start event of stage U>

8

7

Incoming blocknings0

Relay module address code A

0 000

Data transfer rate (Bd)1

SS1 TS1 TS2IRF SS2

Bus communication monitor 0...2552 Password3

Duration of the latest start event of stage U<

= parameter that can be set in the setting mode

Set operate time t< or time multiplier k< of stage U<

Min. voltage measured after reset4

Number of starts of overvoltage stage5

6 Number of starts of undervoltage stage

Min. voltage measured during the last start of U<

3 Checksum of switchgroup SG3

The manual "General characteristics of C typerelay modules", describes how submenus andsetting modes are entered and escaped from and

how setting is carried out. Further the manualdescribes the TRIP-TEST mode of the relaymodule.

11

At inverse time characteristic the operate timewill be shorter the greater the deviation from thesetting value.

The operation of the U> stage is based on inversetime characteristic, when the selector switchSG1/3 on the front panel is in position 1. Atinverse time characteristic the relationship be-tween time and voltage can be expressed asfollows:

t = + c (b - 0.5)

where t = operate time [s]k> = time multiplierU = measured voltage [V]U> = set start voltage [V]a = constant 480b = constant 32c = constant 0.035p = constant

At an IDMT mode of operation the recordingof the operate time of the overvoltage stage doesnot start until the voltage exceeds the set startvalue by 6%. The operate time accuracy statedin the technical data applies when the voltageexceeds the set start value by 10%. The over-voltage stage includes two characteristic curveset. The characteristic curve set is selected withthe selector switch SG1/4.

The degree of inversity is determined by thefactor p as follows:

Characteristic p (constant)

A 2B 3

The operation of the U< stage is based on inversetime characteristic, when the selector switchSG1/7 on the front panel is in position 1. Atinverse time characteristic the relationship be-tween time and voltage can be expressed asfollows:

t = + c (b - 0.5)

where t = operate time [s]k< = time multiplierU = measured voltage [V]U< = set start voltage [V]a = constant 480b = constant 32c = constant 0.055p = constant 2

At an IDMT mode of operation the recording ofthe operate time of the undervoltage stage doesnot start until the voltage falls below the set startvalue by 6%. The operate time accuracy statedin the technical data applies when the voltagefalls below the set start value by 10%. Theundervoltage stage is provided with one charac-teristic curve set.

Voltage/timecharacteristic

k< aU< - U

U

0,05

0,2

0,4

0,71,0

k>

t / s

1,0

k> aU - U>

U>p

12

Fig. 5. Characteristic curve set B of the overvoltage stage U>

0,050,20,40,71,0

k>

U/U>1,51,41,31,21,11,00,01

0,1

1

1 0

100

1000

t / s

1,00,7

0,4

k<

0,2

0,1

U/U< 0,5 0,6 0,7 0,8 0,9 1,00,01

0,1

1

10

100

1000

t/s

Fig. 6. Characteristic curve set C of the undervoltage stage U<

13

Overvoltage stage U>Start voltage U> 0.8...1.6 x UnStart time, preset values 0.1, 1 s, 10 s or 60 sOperate time at definite time operationcharacteristic 0.05...1.00 s and 0.5...10.0 sTime multiplier k> at inverse time operationcharacteristic 0.05...1.0Reset time, typically 50 msDrop-off/pick-up ratio, typically 0.97Operate time accuracy at definite timecharacteristic and start time accuracy ±2 % of set value or ±25 msOperate time accuracy at inverse timecharacteristic ±25 ms or the inaccuracy appearing

when the measured voltage varies ±3%Operation accuracy ±3% of set value

Undervoltage stage U<Start voltage U< 0.4...1.2 x UnStart time, preset values 0.1 s or 30 sOperate time at definite time operationcharacteristic 1...10 s and 10...100 sTime multiplier k< at inverse time operationcharacteristic 0.1...1.0Reset time, typically 60 msDrop-off/pick-up ratio, typically 1.03Operate time accuracy at definite timecharacteristic and start time accuracy ±2% of set value or ±25 msOperate time accuracy at inverse timecharacteristic ±25 ms or the inaccuracy appearing

when the measured voltage varies ±3%Operation accuracy ±3% of set value

Technical data

14

Event codes The substation level control data communica-tor reads, over the SPA serial bus, the event dataof the relay module, e.g. start and trip events,from the overvoltage and undervoltage relaymodule SPCU 1C1. The events are printed outin the format: time (ss.sss) and event code. Theevent codes of the module are E1...E8 and E50and E51. Further, the substation level controldata communicator generates communicator-releted event codes.

The codes E1...E8 and the events represented bythese can be included in or excluded from theevent reporting by writing, over the SPA bus, aso called event mask (V155) to the module. Theevent mask is a binary number coded to adecimal number. The event codes E1...E8 are

represented by the numbers 1, 2, 4...128. Theevent mask is formed by multiplying abovenumbers either by 0 (event not included inreporting) or 1 (event included in reporting)and adding up the numbers received (comparecalculation of checksum).

The event mask may have a value in the range0...255. The default value of the overvoltage andundervoltage relay module SPCU 1C1 is 85,which means that all start and trip events areincluded in the reporting, but no resets. Theevents E50...E54 cannot be excluded from thereporting.

Event codes of the combined overvoltage andundervoltage relay module SPCU 1C1:

Event Event specification Weighting factor Factory setcode of event default value

E1 Starting of overvoltage stage U> 1 1E2 Starting of overvoltage stage U> reset 2 0E3 Operation of overvoltage stage U> 4 1E4 Operation of overvoltage stage U> reset 8 0E5 Starting of undervoltage stage U< 16 1E6 Starting of undervoltage stage U< reset 32 0E7 Operation of undervoltage stage U< 64 1E8 Operation of undervoltage stage U< reset 128 0E50 Restarting * -E51 Overflow of event register * -E52 Temporary disturbance in data communication * -E53 No response from the relay module via

the SPA bus * -E54 The relay module responds again over

the SPA bus * -

0 not included in event reporting1 included in event reporting* no code number- cannot be programmed

NOTE!In the SPACOM system the station level con-trol data communicator forms the event codesE52...E54.

15

Apart from the event codes the substation levelcommunication equipment reads, over the SPAbus, all input data (I data) and output data (Odata), setting values (S values), informationrecorded in the memory (V data), and someother data of the module. Further, part of the

data can be altered by commands given over theSPA bus. Any data are available on channel 0.

R = data that can be read from the moduleW = data that can be written to the module

Remote transferdata


Measured voltage U I1 R 0...9.99 [x Un]Blocking of operation of undervoltage I2 R 0 = no blockingstage U< 1 = tripping of stage U< blocked

Starting of overvoltage stage U> O1 R 0 = U> stage has not started1 = U> stage has started

Operation of overvoltage stage U> O2 R 0 = U> stage has not operated1 = U> stage has operated

Starting of undervoltage stage U< O3 R 0 = U< stage has not started1 = U< stage has started

Operation of undervoltage stage U< O4 R 0 = U< stage has not operated1 = U< stage has operated

Alerted start voltage of stage U> S1 R 0.8...1.6 [x Un]Alerted operate time t> or S2 R 0.05...10 [s] ortime multiplier k> of stage U> 0.05...1.00Alerted start voltage of stage U< S3 R 0.4...1.2 [x Un]Alerted operate time t< or S4 R 1...100 [s] ortime multiplier k< of stage U< 0.1…1.0Alerted checksum of switchgroup SG1 S5 R 0...255

Start voltage of stage U>, S11 R 0.8...1.6 [x Un]set with the setting knobOperate time t> or time multiplier k> of S12 R 0.05...10 [s]stage U>, set with the setting knob 0.05...1.00Start voltage of stage U<, S13 R 0.4...1.2 [x Un]set with the setting knobOperate time t< or time multiplier k< of S14 R 1...100 [s] orstage U<, set with the setting knob 0.1…1.0Checksum of switchgroup SG1 S15 R 0...255(set with the switches)

Remote setting percentage of the S21 R, W 0...999%start voltage of stage U>Remote setting percentage of operate S22 R, W 0...999%time t> or time multiplier k> of stage U>Remote setting percentage of the S23 R, W 0...999%start voltage of stage U<Remote setting percentage of operate S24 R, W 0...999%time t< or time multiplier k< of stage U<Remotely set checksum of S25 R, W 0...255switchgroup SG1

Remotely set start voltage of stage U> S31 R 0.8...1.6 [x Un]Remotely set operate time t> or time S32 R 0.05...10 [s] ormultiplier k> of stage U> 0.05...1.00Remotely set start voltage of stage U< S33 R 0.4...1.2 [x Un]Remotely set operate time t< or time S34 R 1...100 [s] ormultiplier k< of stage U< R 0.1…1.0Remotely set checksum of S35 R 0...255switchgroup SG1

16


Max. voltage measured at starting V1 R 0...9.99 [x Un]of stage U>Max. voltage measured after last reset V2 R 0...9.99 [x Un]Min. voltage measured at starting V3 R 0...9.99 [x Un]of stage U<Min. voltage measured after last reset V4 R 0...9.99 [x Un]Number of starts of overvoltage stage V5 R 0...255Number of starts of undervoltage stage V6 R 0...255Duration of the latest start event of V7 R 0...100%stage U>Duration of the latest start event of V8 R 0...100%stage U<

Resetting of output relays and V101 W 1 = output relays and operationoperation indicators indicators resetSimultaneous resetting of output relays V102 W 1 = output relays and operationand operation indicators and erasing of indicators reset and regis-recorded data ters erased (codes V1…V8)

Remote control of settings V150 R, W 0 = setting with knobsS11...S15 alerted

1 = remote settingsS31...S35 alerted

Event mask word V155 R, W 0...255, see section"Event codes"

Self-reset or manual reset mode of V156 R, W 0…15, see sectionoperation for LED indicators (SG2) "Selector switches"Programming push-buttons (SG3) V157 R, W 0…1, see section

"Selector switches"

Opening of password required for V160 W 1...999remote settingChanging or closing of password V161 W 0...999for remote setting

Activation of self-supervision system V165 W 1 = self-supervision output isactivated and IRF indicatorlit in about 5 seconds,whereafter the self-super-vision system resets and theIRF indicator is switched off

Fault code generated by the self- V169 R 0…255supervision system

Data communication address V200 W 1...254of the module

Program version of the relay module V205 R e.g. 066A

17


Type designation of the relay module F R SPCU 1C1

Reading of event register L R Time, channel number andevent code

Re-reading of event register B R Time, channel number andevent code

Reading of module state data C R 0 = normal status1 = module has been subject

to automatic resetting2 = overflow of event register3 = events 1 and 2 together

Resetting of relay module status data C W 0 = resetting

Reading and setting of clock time T R, W 00.000...59.999 [s]

The data transfer codes L, B, C and T have beenreserved for the event data transfer between themodule and the station level control data com-municator.

The event register can be read by the L com-mand once only. Should a fault occur e.g. in thedata transfer, it is possible, by using the Bcommand, to re-read the contents of the eventregister read by means of the L command. Whenrequired, the B command can be repeated.

The setting values S1...S5 are the setting valuesused by the protection programs. These valuesare set either remotely or by means of the settingknobs. The values S11...S15 are settings set withsetting knobs or switches. S21...S25 are knobsetting percentage factors to be set remotely.The settings S21...S25 allow reading or writing.

A condition for writing is that the password,V160, for remote setting has been opened andthe potentiometer settings must be valid,V150=0. The variables S31...S35 contain theremote setting values.

When changing the remote setting percentagesS21...S24, these variables can be given a per-centage factor within the range 0...999. Then itis also possible to alter the setting value beyondthe setting ranges specified in the technical dataof the module. However, the validity of thesetting values is guaranteed only within thesetting ranges specified in the technical data.

Activation of the self-supervision input (V165)prevents the protection from operating as longas the self-supervision input is activated and theIRF indicator is on.

18

Fault codes Shortly after the self-supervision system hasdetected a permanent internal fault the red IRFindicator is lit. Simultaneously the relay moduleputs forward a control signal to the output relayof the self-supervision system. In most faultsituations an autodiagnostic fault code appearson the display of the module. The fault codeconsists of a red figure 1 (one), and a green, one,

two or three digit code number. When a fault isdetected the fault code should be recorded andstated when the relay module is to be repaired.

Some of the fault codes that may appear on thedisplay of the combined overvoltage and under-voltage relay module SPCU 1C1 are shown inthe following list:

Fault code Type of fault

4 Output relay control circuit interrupted or output relay module missing30 Faulty Read Only Memory (ROM)50 Faulty Random Access Memory (RAM)

195 Too low a value on reference channel with multiplier 1131 Too low a value on reference channel with multiplier 567 Too low a value on reference channel with multiplier 25

203 Too high a value on reference channel with multiplier 1139 Too high a value on reference channel with multiplier 575 Too high a value on reference channel with multiplier 25

253 No interruptions from the A/D converter

L1 IRF

>I

L2I L3II

1309

[ ]sk

>t0.5

0.05 1.0

13

2.5

0.5

0.04 1.0

0.5

1.5

2.5

STEP

RESET

SG1

0 1

1234567820

STEP

>>I

nI>I

nI>>I

>>t [ ]s

>I >>I

SPCJ 3C3

B

Indicators for measured values

Setting knob 1with indicator

Stage 1



Stage 2


Self-supervision alarm indicator(Internal Relay Fault)

Display, 1 + 3 digits

Step push-button (STEP)

Programming switches SG1

Switchgroup indicator

Reset push-button (RESET)

Start/operation indicators

General characteristics ofC-type relay modules


2

General characteristics ofC-type relay modules

Contents Push-buttons .................................................................................................................. 2Programming switches SG1 ............................................................................................ 2Setting knobs .................................................................................................................. 3Display ........................................................................................................................... 3

Display main menu ................................................................................................... 3Display submenu ....................................................................................................... 4Setting mode ............................................................................................................. 4Example: Operation in setting mode ......................................................................... 5Stored information .................................................................................................... 6Trip-test mode........................................................................................................... 7Example: Trip-test function ...................................................................................... 8

Operation indicators ....................................................................................................... 9Fault codes ...................................................................................................................... 9

Push-buttons The front panel of the relay module containstwo push-buttons. The STEP button is used forstepping forward in the display and the RESETbutton for resetting the red indicators. Addi-tionally, the push-buttons are used for certain

settings, e.g. for setting the address of the relaymodule and the data transfer rate for the serialcommunication when the modules are used inrelay packages provided with this quality. (Seesection Display).

Programmingswitches SG1

Part of the settings and the selections of theoperating characteristics for the relay modulesin various applications are made with the pro-gramming switches SG1 on the front panel. Theindicator of the switchgroup glows when the

checksum of the switchgroup is shown on thedisplay. The checksum can be used for checkingthat the switches are properly set. Fig. 2 gives anexample of calculating the checksum.

Fig. 2. Example of calculating the checksum of programming switchgroup SG1.

When the checksum calculated according to theexample is equal to the checksum indicated onthe display of the relay module, the switches areproperly set.

The function of the programming switches ofthe individual measuring relay modules is speci-fied in the description of the module concerned.

1MRS 750328-MUM EN

Issued 96-02-19Version A (replaces 34 SPC 2 EN1)Checked L-W UApproved TK


3

Setting knobs Most of the operating values and operatingtimes are set by means of the setting knobs onthe front panel of the relay module. Each settingknob has its own (LED) indicator which glowswhen the concerned setting value is shown onthe display.

If a setting knob is turned while the display isshowing another measured or set value, thevalue being set automatically appears on thedisplay. Simultaneously, the indicator for theconcerned setting starts glowing.

In addition to the settings made with the settingknobs, most modules allow so called remotesetting. This means that the settings made bymeans of the setting knobs of the module andthe checksum of the programming switchgroupmay be altered through an instruction over theserial communication bus. Remote setting ispossible if the password in the register A isknown, and the remote settings are not acti-vated, i.e. parameter V150=0. The circumstancethat the remote settings are activated is shownwith a flashing light of the indicator of thesetting knob, the value of which currently isbeing displayed.

Display The measured and set values as well as the datarecorded are shown on the display of the meas-uring relay module. The display consists of fourdigits. The three digits (green) to the rightindicate the measured, set or stored value andthe digit at the extreme left (red) the number ofthe register. The measured or set value displayedis indicated by a yellow LED indicator. Thenumber of the register glows only when a storedvalue is displayed.

When the auxiliary voltage is connected to ameasuring relay module, the module initiallytests the display by stepping through the digits1...9 for about 15 seconds. When the test isfinished the display turns dark. The testing canbe interrupted by pressing the STEP button.The protective functions of the module areoperative throughout the testing.

Display main menu All the data required during normal operatingconditions are accessible from the main menuwhich presents the measured values in real-time,the normal setting knob settings as well as themost important memorized data.

The data to be shown in the main menu areselected to the display in a certain sequence bymeans of the STEP button. When pressing theSTEP button for about one second, the displaymoves forward in the display sequence. Whenpressing it for about 0.5 seconds, the displaymoves backwards in the display sequence.

From a dark display only forward movement ispossible. When keeping the STEP button de-pressed, the display is continuously moving inforward direction stopping for a while at thedark point.

Unless the display is switched off by stepping tothe dark point, it remains activated for about 5minutes from the last pressing of the STEPbutton and then goes out.

4

Display submenu Less important values and values not very oftenset are displayed in the submenus. The numberof submenus varies with different relay moduletypes. The submenus are presented in the de-scription of the concerned module.

A submenu is entered from the main menu bypressing the RESET button for about one sec-ond. When the button thereafter is released, thered digit (STEP) of the display starts flashing,indicating that one is in a submenu. Going fromone submenu to another or back to the mainmenu follows the same principle as when mov-ing from the main menu display to another; the

display moves forward when pressing the STEPbutton for one second and backward whenpressing it for 0.5 seconds. The return to themain menu has taken place when the red STEPdisplay turns dark.

When entering a submenu from a measured orset value indicated by a LED indicator, theindicator remains glowing and the address win-dow (STEP) of the display starts flashing. Aflashing address window when no LED indica-tor is lit indicates that the submenu of a registerhas been entered.

Fig. 3. Example of the main and submenus for the settings of the overcurrent relay module SPCJ3C3. The settings made with the setting knobs are in the main menu and they are displayed bypressing the STEP button. In addition to the setting knob settings the main menu contains themeasured current values as well as the registers 1…5, as well as 0 and A. The remote settingpercentage and remote setting value are located in the submenus for the settings and are activatedon the display by pressing the RESET button.

Setting mode The registers of the main menu and the submenusalso contain parameters to be set. The settingsare made in the so called setting mode, which isaccessible from the main menu or a submenu bypressing the RESET button, until the digit atthe extreme right starts flashing (about 10 s).The flashing digit is set by means of the STEPbutton. The flashing is moved on from digit todigit by pressing the RESET button.

A set value is stored in the memory by pressingthe push-buttons STEP and RESET simultane-ously. In practice the RESET button must be

pressed slightly in excess of the STEP button.Return from the setting mode to the main menuor submenu is possible by pressing (for about 10s) the RESET button until the green digits onthe display stop flashing. If the module is left inthe setting mode, it will return automatically tothe start condition after about 5 minutes.

The values to be set in the setting mode are forinstance the address code of the relay moduleand the data transfer rate for the serial commu-nication. Further the percentage values for theremote settings can be changed.

5

Example 1: Function in the setting mode. Manual setting ofthe address code of a relay module and the datatransfer rate for the serial communication. Theinitial value for the address code is 146.

a)Press push-button STEP until register address Aappears on the display.

b)Press the RESET button for about 10 s until theright most digit starts flashing.

c)Press the STEP button repeatedly to set the digitto the value desired.

d)Press the RESET button to make the middle ofthe green digits flash.

e)Set the middle address digit by means of theSTEP button.

f)Press the RESET button to make the left mostgreen digit flash.

g)Set the digit by means of the STEP button.

h)Store the set address number in the memory ofthe relay module by pressing the RESET andSTEP button simultaneously. At the momentthe information enters the memory, the threegreen dashes flash in the display, i.e. A—.

i)Leave the setting mode by pressing the RESETbutton for about 10 s, until the display stopsflashing.

j)Then enter submenu 1 of register A by pressingthe RESET button for approx. one second. Theregister address A is then replaced by a flashing1. This submenu is used for setting the datatransfer rate of the serial communication.

k)The data transfer rate for the serial communica-tion is set and stored in the same way as theaddress, see sections b...i, except that the con-tinuously glowing register address has been re-placed by a flashing 1.

l)After storing the data transfer rate for the serialcommunication you may return to the mainmenu of register A by pressing the STEP buttonfor about 0.5 second.

6

Stored information The parameter values measured at the momentwhen a fault occurs are recorded in the registers,in some modules also the setting values. Therecorded data, except for some setting param-eters, are set to zero by pressing the push-buttons STEP and RESET simul-taneously.The data in normal registers are erased if theauxiliary voltage supply to the relay is disrupted,only the set values and the number ofautoreclosings are maintained in the registers ata voltage failure.

The number of the registers varies with differentmodule types. The function of the registers areillustrated in the descriptions of the separaterelay modules. Additionally, the system panelcontains a simplified list of the data recorded bythe various relay modules of the relay assembly.

All C-type relay modules are provided with twogeneral registers: register 0 and register A.

Register 0 contains, in coded form, the informa-tion about e.g. external blocking signals andstatus information for the circuit breaker. Thecodes are explained in the descriptions of therelay modules.

Register A contains the address code of the relaymodule as required by the serial communicationsystem. Example 1 on page 4 shows how theaddress code is altered. Submenu 1 of register Acontains the data transfer rate value expressed inkilobaud for the serial communication.

Submenu 2 of register A contains a bus trafficmonitor for the SPACOM system. If the protec-tive relay, which contains the relay module, islinked to a system including the control datacommunicator and the data communicationsystem is operating, the counter reading of themonitor will be zero. Otherwise the digits 1...255are continuously rolling in the monitor.

Submenu 3 contains the password required forchanging the remote settings. The address code,the data transfer rate for the serial communica-tion and the password can be set manually or viathe serial communication bus. For manual set-ting see example 1.

The start value for the address code and thepassword is 001 and that for the data transferrate 9.6 kilobaud.

7

Trip-test mode Register 0 also allows access to the so calledTrip-test function, which allows the outputsignals of the relay module to be activated one byone. If the auxiliary relay module of the protec-tion assembly is in place, the auxiliary relays willbe included in the testing.

When pressing the RESET button for about 10seconds, the three green digits to the right startflashing to indicate that the relay module is intest position. The indicators of the setting knobsindicate by flashing which output signal can beactivated. The required output function is se-lected by pressing the RESET button for about1 second, until the following LED indicatorstarts flashing.

The indicators of the setting knobs refer to thefollowing output signals:Setting knob 1 SS1 Starting of stage 1Setting knob 2 TS1 Tripping of stage 1Setting knob 3 SS2 Starting of stage 2Setting knob 4 TS2 Tripping of stage 2No indication IRF Self-supervision

The selected starting or tripping is activated bysimultaneous pressing of the push-buttons STEPand RESET. The signal remains activated aslong as the two push-buttons are being pressed.

The self-supervision output is activated by press-ing the STEP button once when no setting knobindicator is flashing. The IRF output is acti-vated in about 5 seconds after pressing of theSTEP button, and resets after that. Simultane-ously, the display returns to the main menu andperforms the initial testing indicated by rollingdigits 0...9 in the display several times.

The signals are selected in the order illustrated infig. 4.

REGISTER 0IRF SS1 TS1 SS2 TS2

STEP STEP+RESET

STEP+RESET

STEP+RESET

STEP+RESET

RESET10 s

RESET1 s

RESET1 s

RESET1 s

RESET1 s

RESET1 s

Fig. 4. Sequence order for selecting the output signals in the Trip-test mode.

If e.g. the indicator of the setting knob 2 (secondfrom the top) is flashing, and the push-buttonsSTEP and RESET are being pressed, the signalTS1 (tripping of stage 1) is activated. Return tothe main menu is possible at any stage of the

Trip-test sequence scheme, by pressing theRESET button for about 10 seconds. If themodule is left in the Trip-test mode, it willreturn automatically after approx. 5 minutes.

8

Example 2: Trip-test function. Forced activation of the out-puts is made as follows:

a)Step forward on the display to register 0.

b)Press the RESET button for about 10 secondsuntil the three green digits to the right and theLED indicator of the uppermost setting knobstart flashing.

c)Press the push-buttons RESET and STEP si-multaneously. Then the starting of stage 1 (e.g.the I>-stage of the overcurrent module SPCJ3C3) is activated and, simultaneously, the indi-cator of the stage starts glowing yellow.

d)Press the RESET button for about 1 seconduntil the indicator of the second setting knobstarts flashing.

e)Press the push-buttons RESET and STEP si-multaneously to activate tripping of stage 1 (e.g.the I>-stage of the overcurrent module SPCJ3C3). The indicator of the concerned stagestarts glowing red.

f)Starting and tripping of the second stage isactivated in the same way as stage 1. The indica-tor of the third or fourth setting starts flashing toindicate that the concerned stage has been acti-vated.

g)To activate the self-supervision output step to-wards the test position, where no indicator isflashing. Press the STEP button once. In about5 seconds the red IRF indicator starts glowingand the IRF output is activated. Shortly thereaf-ter the indicator goes out and the output auto-matically resets. At the same time the moduleleaves the test position.

h)It is possible to leave the trip test mode at anystep of the sequence scheme by pressing theRESET button for about 10 seconds until thethree digits to the right stop flashing.

9

Operationindicators

A measuring relay module is provided with twoseparate operating stages, each of which with itsown yellow/red operation indicator on the lowerpart of the front plate of the relay module.

The operation indicator starts glowing yellowwhen the operating stage starts and red when adelayed tripping operates. The functions of thestart and operation indicators are described indetail in the different protection relay modulemanuals.

Fault codes In addition to the protective functions the relaymodule is provided with a self-supervision sys-tem which continuously supervises the functionof the microprocessor, its program executionand the electronics.

When the self-supervision system has detected apermanent fault in the relay module, the redIRF indicator on the panel starts glowing soonafter the fault was discovered. At the same timethe module puts forward a signal to the self-supervision contact of the relay assembly.

In most fault situations a fault code, indicatingthe nature of the fault, appears on the display ofthe module. The fault code, which consists of ared digit (1) and a three digit green code number,cannot be removed from the display by reset-ting. When a fault occurs, the fault code shouldbe recorded and stated when service is ordered.

1MR

S 7

5072

6-M

UM

E

N

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Documents

SPAU 320 C Overvoltage, undervoltage and residual voltage ...€¦ · 6 The voltage measured by the over- and under-current modules is connected to terminals 13-14 when the rated