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Service Manual

Type MCSU 01Sensitive Earth Fault Relay

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HANDLING OF ELECTRONIC EQUIPMENT

A person's normal movements can easily generate electrostatic potentials of several thousand volts.Discharge of these voltages into semiconductor devices when handling electronic circuits can causeserious damage, which often may not be immediately apparent but the reliability of the circuit will havebeen reduced.

The electronic circuits of ALSTOM T&D Protection & Control Ltd products are completely safe fromelectrostatic discharge when housed in the case. Do not expose them to the risk of damage bywithdrawing modules unnecessarily.

Each module incorporates the highest practicable protection for its semiconductor devices. However, if itbecomes necessary to withdraw a module, the following precautions should be taken to preserve the highreliability and long life for which the equipment has been designed and manufactured.

1. Before removing a module, ensure that you are at the same electrostatic potential as the equipment

by touching the case.2. Handle the module by its front-plate, frame, or edges of the printed circuit board.

Avoid touching the electronic components, printed circuit track or connectors.

3. Do not pass the module to any person without first ensuring that you are both at the sameelectrostatic potential. Shaking hands achieves equipotential.

4. Place the module on an antistatic surface, or on a conducting surface which is at the samepotential as yourself.

5. Store or transport the module in a conductive bag.

More information on safe working procedures for all electronic equipment can be found in BS5783 andIEC 60147-0F.

If you are making measurements on the internal electronic circuitry of an equipment in service, it is

preferable that you are earthed to the case with a conductive wrist strap.Wrist straps should have a resistance to ground between 500k 10M ohms. If a wrist strap is notavailable, you should maintain regular contact with the case to prevent the build up of static.Instrumentation which may be used for making measurements should be earthed to the case wheneverpossible.

ALSTOM T&D Protection & Control Ltd strongly recommends that detailed investigations on the electroniccircuitry, or modification work, should be carried out in a Special Handling Area such as described inBS5783 or IEC 60147-0F.

Service Manual

Type MCSU 01Sensitive Earth Fault Relay

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CONTENTS

SAFETY SECTION 5

1 DESCRIPTION 9

2 INSTALLATION 92.1 General 92.2 Relay mounting 92.3 Unpacking 92.4 Storage 92.5 Site 10

3 COMMISSIONING 103.1 Commissioning preliminaries 103.1.1 Electrostatic discharges 103.1.2 Inspection 103.1.3 Wiring 10

3.1.4 Earthing 113.1.5 Insulation 113.1.6 DANGER 113.2 Commissioning tests 113.2.1 Test equipment 113.2.2 Relay CT shorting switches 113.2.3 Auxiliary supply 113.2.4 Plug bridge check 123.2.5 Tap setting multiplier 123.2.6 Timing tests 133.2.7 Final setting check 13

3.2.8 Final checks 134 SETTINGS 144.1 Settings 144.1.1 Time delay 144.1.2 Current setting 14

5 MAINTENANCE 14

6 PROBLEM ANALYSIS 146.1 Procedure 146.1.1 Removal of the relay from its case 146.1.2 Current transformer check 14

6.1.3 Transistor TR4 (not 30V models) 156.1.4 Output relay and non volatile led indication 156.1.5 Printed circuit board 15

7 SPARES 15

8 COMMISSIONING TEST RECORD 19

REPAIR FORM 21

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SAFETY SECTION

This Safety Section should be read before commencing any work onthe equipment.

Health and safety

The information in the Safety Section of the product documentation is intended toensure that products are properly installed and handled in order to maintain them ina safe condition. It is assumed that everyone who will be associated with theequipment will be familiar with the contents of the Safety Section.

Explanation of symbols and labels

The meaning of symbols and labels which may be used on the equipment or in theproduct documentation, is given below.

Caution: refer to product documentation Caution: risk of electric shock

Protective/safety *earth terminal

Functional *earth terminal.Note: this symbol may also be used for a protective/safety earth terminal if that terminal is part of aterminal block or sub-assembly eg. power supply.

*Note: The term earth used throughout the product documentation is the directequivalent of the North American term ground.

Installing, Commissioning and ServicingEquipment connections

Personnel undertaking installation, commissioning or servicing work on thisequipment should be aware of the correct working procedures to ensure safety.The product documentation should be consulted before installing, commissioning orservicing the equipment.

Terminals exposed during installation, commissioning and maintenance may presenta hazardous voltage unless the equipment is electrically isolated.

If there is unlocked access to the rear of the equipment, care should be taken by allpersonnel to avoid electric shock or energy hazards.

Voltage and current connections should be made using insulated crimp terminationsto ensure that terminal block insulation requirements are maintained for safety.To ensure that wires are correctly terminated, the correct crimp terminal and tool for

the wire size should be used.

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Before energising the equipment it must be earthed using the protective earthterminal, or the appropriate termination of the supply plug in the case of plugconnected equipment. Omitting or disconnecting the equipment earth may cause asafety hazard.

The recommended minimum earth wire size is 2.5 mm2, unless otherwise stated in

the technical data section of the product documentation.Before energising the equipment, the following should be checked:

Voltage rating and polarity;

CT circuit rating and integrity of connections;

Protective fuse rating;

Integrity of earth connection (where applicable)

Equipment operating conditions

The equipment should be operated within the specified electrical and environmentallimits.

Current transformer circuits

Do not open the secondary circuit of a live CT since the high voltage producedmay be lethal to personnel and could damage insulation.

External resistors

Where external resistors are fitted to relays, these may present a risk of electric shockor burns, if touched.

Battery replacement

Where internal batteries are fitted they should be replaced with the recommendedtype and be installed with the correct polarity, to avoid possible damage to theequipment.

Insulation and dielectric strength testing

Insulation testing may leave capacitors charged up to a hazardous voltage. At theend of each part of the test, the voltage should be gradually reduced to zero, todischarge capacitors, before the test leads are disconnected.

Insertion of modules and pcb cards

These must not be inserted into or withdrawn from equipment whilst it is energised,since this may result in damage.

Fibre optic communication

Where fibre optic communication devices are fitted, these should not be vieweddirectly. Optical power meters should be used to determine the operation or signallevel of the device.

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Older ProductsElectrical adjustments

Equipments which require direct physical adjustments to their operating mechanism tochange current or voltage settings, should have the electrical power removed before

making the change, to avoid any risk of electric shock.Mechanical adjustments

The electrical power to the relay contacts should be removed before checking anymechanical settings, to avoid any risk of electric shock.

Draw out case relays

Removal of the cover on equipment incorporating electromechanical operatingelements, may expose hazardous live parts such as relay contacts.

Insertion and withdrawal of extender cards

When using an extender card, this should not be inserted or withdrawn from the

equipment whilst it is energised. This is to avoid possible shock or damage hazards.Hazardous live voltages may be accessible on the extender card.

Insertion and withdrawal of heavy current test plugs

When using a heavy current test plug, CT shorting links must be in place beforeinsertion or removal, to avoid potentially lethal voltages.

Decommissioning and DisposalDecommissioning: The auxiliary supply circuit in the relay may include capacitors

across the supply or to earth. To avoid electric shock or energy

hazards, after completely isolating the supplies to the relay(both poles of any dc supply), the capacitors should be safelydischarged via the external terminals prior to decommissioning.

Disposal: It is recommended that incineration and disposal to watercourses is avoided. The product should be disposed of in a safemanner. Any products containing batteries should have themremoved before disposal, taking precautions to avoid shortcircuits. Particular regulations within the country of operation,may apply to the disposal of lithium batteries.

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Technical SpecificationsProtective fuse rating

The recommended maximum rating of the external protective fuse for this equipmentis 16A, Red Spot type or equivalent, unless otherwise stated in the technical data

section of the product documentation.Insulation class: IEC 61010-1: 1990/A2: 1995 This equipment requires a

Class I protective (safety) earthEN 61010-1: 1993/A2: 1995 connection to ensure userClass I safety.

Installation IEC 61010-1: 1990/A2: 1995 Distribution level, fixedCategory Category III installation. Equipment in(Overvoltage): EN 61010-1: 1993/A2: 1995 this category is qualification

Category III tested at 5kV peak, 1.2/50s,500, 0.5J, between all supply

circuits and earth and alsobetween independent circuits.

Environment: IEC 61010-1:1990/A2: 1995 Compliance is demonstrated byPollution degree 2 reference to generic safetyEN 61010-1: 1993/A2: 1995 standards.Pollution degree 2

Product safety: 73/23/EEC Compliance with the EuropeanCommission Low VoltageDirective.

EN 61010-1: 1993/A2: 1995 Compliance is demonstratedEN 60950: 1992/A11:1997 by reference to generic safety

standards.

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Section 1. DESCRIPTION

The MCSU is a sensitive earth fault relay which can be applied to detect earth faultcurrents down to 0.5% of the current transformer nominal current. An adjustable timedelay ensures stability during switching and other transient disturbances and allows

adequate grading with other protection systems at high fault current levels. The relaywill reset at a current only marginally below pick-up level, permitting a setting leveljust above the maximum residual current at the fundamental frequency.

The MCSU 01 may be used in conjunction with a METI 13 (see Publication R8003)to form a directional earth fault scheme. This scheme uses the directional controlterminals 21 and 22 to inhibit the operation of the MCSU 01. When a short isapplied to terminals 21 and 22, current from the transformer secondary is divertedfrom the measuring circuits into the short; thus inhibiting the MCSU 01 fromoperating.

See Publication R6018.

Section 2. INSTALLATION

2.1 General

Protective relays, although generally of robust construction, require careful treatmentprior to installation and a wise selection of site. By observing a few simple rules thepossibility of premature failure is eliminated and a high degree of performance canbe expected.

2.2 Relay mounting

The relays are either despatched individually or as part of a panel/rack mountedassembly in cartons specifically designed to protect them from damage.

Relays should be examined immediately they are received to ensure that nodamage has been sustained in transit. If damage due to rough handling is evident,a claim should be made to the transport company concerned immediately, andALSTOM T&D Protection & Control should be promptly notified. Relays which aresupplied unmounted and not intended for immediate installation should be returnedto their protective polythene bags.

2.3 Unpacking

Care must be taken when unpacking and installing the relays so that none of theparts are damaged or their settings altered, and must only be handled by skilledpersons.

Relays should be examined for any wedges, clamps, or rubber bands necessary tosecure moving parts to prevent damage during transit and these should be removedafter installation and before commissioning.

Relays which have been removed from their cases should not be left in situationswhere they are exposed to dust or damp. This particularly applies to installationswhich are being carried out at the same time as constructional work.

2.4 Storage

If relays are not installed immediately upon receipt they should be stored in a place

free from dust and moisture in their original cartons and where de-humidifier bagshave been included in the packing they should be retained.

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The action of the de-humidifier crystals will be impaired if the bag has been exposedto ambient conditions and may be restored by gently heating the bag for about anhour, prior to replacing it in the carton.

Dust which collects on a carton may, on subsequent unpacking, find its way into therelay; in damp conditions the carton and packing may become impregnated with

moisture and the de-humidifying agent will lose its efficiency.The storage temperature range is 25C to +70C.

2.5 Site

The installation should be clean, dry and reasonably free from dust and excessivevibration. The site should preferably be well illuminated to facilitate inspection.

An outline diagram is normally supplied showing panel cut-outs and hole centres.For individually mounted relays these dimensions will also be found in publicationR6017.

Publication R7012, Parts Catalogue and Assembly Instructions, will be useful when

individual relays are to be assembled as a composite rack or panel mountedassembly.

Publication R6001 is a leaflet on the modular integrated drawout system of protectiverelay.

Publication R6014 is a list of recommended suppliers for the pre-insulatedconnectors.

Section 3. COMMISSIONING

3.1 Commissioning preliminaries

3.1.1 Electrostatic discharges

The relay uses components which could be affected by electrostatic discharges.When handling the module, care should be taken to avoid contact with componentsand connections. When removed from the case for storage, the module should beplaced in an electrically conducting anti-static bag.

3.1.2 Inspection

Carefully examine the module and case to see that no damage has occurred duringtransit. Check that the relay serial number on the module, case and cover areidentical and that the model number and rating information are correct.

Carefully remove any elastic bands/packing fitted for transportation purposes.

3.1.3 Wiring

Check that the external wiring is correct to the relevant relay diagram and schemediagram. The relay diagram number appears inside the case. Particular attentionshould be paid to the correct wiring and value of any external resistors indicated onthe wiring diagram/relay rating information. Note the shorting switches shown onthe relay diagram are fitted internally across the relevant case terminals and closewhen the module is withdrawn. It is essential that such switches are fitted across allCT circuits.

If a test block type MMLG is provided, the connections should be checked to thescheme diagram, particularly that the supply connections are to the live side of the

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test block (coloured orange) and with terminals allocated with odd numbers (1, 3, 5,7 etc). The auxiliary supply voltage to the scheme should be routed via test blockterminals 13 and 15.

3.1.4 Earthing

Ensure that the case earthing connection above the rear terminal block is used toconnect the relay to a local earth bar.

3.1.5 Insulation

The relay and its associated wiring, may be insulation tested between:

all electrically isolated circuits

all circuits and earth

An electronic or brushless insulation tester should be used, having a dc voltage notexceeding 1000V. Accessible terminals of the same circuit should first be strappedtogether. Those deliberate circuit earthing links which are removed for the tests, mustsubsequently be reconnected.

3.1.6 DANGER

DO NOT OPEN THE SECONDARY CIRCUIT OF A CURRENT TRANSFORMER.THE HIGH VOLTAGE PRODUCED MAY BE LETHAL AND COULD DAMAGE INSULATION.

When the type MMLG test block facilities are installed, it is important that the socketsin the type MMLB 01 test plug, which correspond to the CT secondary windings, areLINKED BEFORE THE TEST PLUG IS INSERTED INTO THE TEST BLOCK. Similarly, aMMLB 02 single finger test plug must be terminated with an ammeter BEFORE IT ISINSERTED to monitor CT secondary currents.

3.2 Commissioning tests

3.2.1 Test equipment1 Variable voltage auto transformer, eg Variac

1 Variable resistor

1 Two pole switch

1 ac ammeter

An overcurrent test set with timing facilities may be used if preferred.

3.2.2 Relay CT shorting switches

With the relay removed from its case, check that the CT shorting switch is closed byinjecting rated current into the neutral circuit.

The rated current of the relay (In) is either 1A or 5A as shown on the bottom handlestrip of the relay module.

3.2.3 Auxiliary supply

With the relay removed from its case, the incoming supply should be checked at therelay case terminals. The incoming voltage must be within the range specified on therating strip.

If a dc auxiliary supply is used then relay case terminal 13 should be positive withrespect to terminal 14.

For secondary injection testing using test block type MMLG, insert test plug typeMMLB01 with the required main CT shorting links fitted. Isolate the relay trip and

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alarm circuits. Insert the module and connect the auxiliary supply to the relay.It may then be necessary to link across the front of the test plug to restore theauxiliary supply to the relay.

3.2.4 Plug bridge check

Set the multiplier to 1.0. Set the relay time delay to 1 second. Inject ac current intothe relay current terminals slowly increasing the current until the relay picks up.Check each plug position with/without the plug removed to ensure that the top tap(8%) is selected and that the main CT will not be open circuited.

The current pick-up range is shown in the table below.

Note: No allowance has been made for instrument errors in measurement of the accurrent.

AC current operative level (mA)

Tap setting In = 1A In = 5A

0.5% 4.75 5.25 23.75 26.25

1% 9.5 10.5 47.5 52.5

2% 19 21 95 105

4% 38 42 190 210

8% 76 84 380 420

3.2.5 Tap setting multiplier

Set the relay time delay to 1 second.

The plug bridge can be on any setting but for ease of measuring the followingpositions are recommended. See the table below.

Inject ac current into the relay current terminals, slowly increasing the current until therelay picks up. Check each multiplier setting.

The current pick up range for the recommended tap settings is shown in the tablebelow but it must be noted that no allowance has been made for instrument errors inmeasurement of the ac current.

AC current operating level (mA)

Multiplier In = 1A In = 5APlug setting = 4% Plug setting = 1%

Setting Is% Pick-up range Is% Pick-up range

1.1 4.4 41.8 46.2 1.1 52.25 57.75

1.2 4.8 45.6 50.4 1.2 57 63

1.3 5.2 49.4 54.6 1.3 61.75 68.25

1.4 5.6 53.2 58.8 1.4 66.5 73.5

1.5 6.0 57 63 1.5 71.25 78.75

1.6 6.4 60.8 67.2 1.6 76 84

1.7 6.8 64.6 71.4 1.7 80.75 89.25

1.8 7.2 68.4 75.6 1.8 85.5 94.5

1.9 7.6 72.2 79.8 1.9 90.25 99.75

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3.2.6 Timing tests

Any plug and multiplier setting may be chosen for this test.

Using a typical test circuit as shown in Figure 1, inject ac current of at least 110% Isinto the relay with the relay timer set to the values given in the table below. Check theoperating times.

Operating time range (seconds)

Timer setting 0.1 to 9.9 1 to 99

01 0.08 0.12 0.95 1.05

12 1.14 1.26 11.4 12.6

23 2.185 2.415 21.85 24.15

34 3.23 3.57 32.3 35.7

45 4.275 4.725 42.75 47.25

56 5.32 5.88 53.2 58.8

67 6.365 7.035 63.65 70.3578 7.41 8.19 74.1 81.9

89 8.455 9.345 84.55 93.45

90 8.55 9.45 85.5 94.5

3.2.7 Final setting check

This test should be carried out using the required final settings.

Inject ac current into the relay and slowly increase to 105% Is to ensure that the relaypicks-up.

With the relay picked up slowly reduce the ac current to 90% Is and check that therelay has reset. (Drop off.)

At this stage a final visual check of the settings should be carried out and the coverput into position.

Check that the LED resets.

Using the typical circuit, check that the operating time of the relay is within theclaimed tolerance of5% or 0.02S whichever is the greater.

Check that the LED indicator has operated and resets when the ac current has beenremoved.

3.2.8 Final checks

Operate the relay with the trip and alarm links restored to ensure that the necessarytrip and alarm circuits are energized according to the relevant schematic diagram.

Disconnect test circuits, and test plugs, and remove any main CT short circuits.

CAUTION: If test block MMLG has been used it is essential that the test block coveris replaced to put the relay in service.

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Section 4. SETTINGS

4.1 Settings

4.1.1 Time delay

The operating time of the relay is adjusted by the upper two thumbwheel switches.Time ranges are:

0.1 9.9 seconds in steps of 0.1 second

or 1 99 seconds in steps of 1 second

00 is a non-allowable setting.

4.1.2 Current setting

The setting current, as a percentage of relay rated current, is set by the plugbridge,which gives coarse adjustment (0.5, 1, 2, 4, 8% In), and the lower thumbwheelswitch which acts as a setting multiplier over the range 1.0 1.9 in steps of 0.1.

eg. For a required setting of 3.5%:

Set plugbridge to next lowest setting, ie. 2%.

3.5% requires a multiplier setting of 1.75, which is not available, so choosebetween the two nearest points:

1.7 x 2% = 3.4%or 1.8 x 2% = 3.6%

Section 5. MAINTENANCE

Periodic maintenance is not necessary. However, periodic inspection and test isrecommended. It is recommended that commissioning tests 3.2.7 and 3.2.8 arerepeated at periodic intervals to check the operation of the relay.

Section 6. PROBLEM ANALYSIS

It is recommended that faulty printed circuit boards are replaced, and no attempt bemade to remove or change components on them. This is because the protectivecoating on the board is degraded by attempting to solder through it. Theseinstructions therefore do not go into sufficient detail to permit the identification of

faulty components at printed circuit board level.

6.1 Procedure

6.1.1 Removal of the relay from its case

To remove the relay from its case loosen the cover nuts and remove the cover.The relay can now be withdrawn from the case by pulling on the handles.

6.1.2 Current transformer check

Disconnect the CT secondary from the board by disconnecting the wire to terminal 1on pcb ZJ0039.

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Connect an ac milliammeter between the red and black leads and inject rated currentinto relay terminals 27 and 28. Measure the secondary current for each position ofthe plugboard tap selector on the relay front panel. Currents should be within 5% ofthe values shown in the table below.

Tap % Current mA

0.5 20

1 10

2 5

4 2.5

8 1.25

If these currents are correct, reconnect the CT to the board with the red lead in pin 1.

6.1.3 Transistor TR4 (not 30V models)

This is the series voltage regulator transistor which is fitted to all except 30V models.When fitted it is mounted on a heatsink in the ventilated enclosure at the rear of therelay.

Apply rated auxiliary volts and measure the dc voltage across electrolytic capacitorC18. If this is not approximately 30V then disconnect TR4 at pcb ZJ0039 terminal 7and measure the dc voltage across diode D16. If this is approximately 30V then TR4is defective and should be replaced.

6.1.4 Output relay and non volatile LED indication

Set time delay to minimum. Inject a current above setting into the relay. If the ouputrelay fails to operate measure the voltage between terminals 9 and 10 on pcb

ZJ0039. This should be 24V for 110/125V and 48/54V rated relays and 12V for27/34V rated relays. If volts are present but the ouput relay does not pick up,replace the pcb ZG1001. Otherwise the fault is on pcb ZJ0039.

If the LED does not illuminate or will not reset measure the voltage between terminals9 and 11 on pcb ZJ0039. This should be 30V on 110/125V and 48/54V ratedrelays and the input voltage less 2V on 27/34V relays. If this voltage is correct,replace ZG1001 otherwise replace ZJ0039.

6.1.5 Printed circuit board

Any fault which cannot be traced to the current transformer, miniature relay ortransistor TR4 may safely be assumed to be on the printed circuit board, in which

case the relay should be returned to ALSTOM Protection & Control for repair.Should the need arise for the equipment to be returned to ALSTOM T&D Protection &Control for repair, then the form at the back of this manual should be completed andsent with the equipment together with a copy of any commissioning test results.

Section 7. SPARES

When ordering any spares the serial number and model number of the relay shouldbe included with the order.

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Figure1:

Typicaltestc

ircuit

1 28

27

14

1364253

Auxiliary

ct

ACSupply

Variable

Auto

Trans

former

Va

riableResistor

Switch

A

Start

Stop

Auxiliary

Supply

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Figure2:Applicationdiagram

Se

nsitiveearthfaultr

elay

TypeMC

SU01

Output

Contacts

NOTE1

(a)

CTSHORTINGLINKSMAKE

BEFORE(b)&(c)DISCONNECT

(b)

SHORTTERMINALSBREAKBEFORE(c).

(c)

LONGTERMINALS

NOTE2

EARTHINGCONNECTIONSASSHOWNARETYPICALONLY.

3 5 13

27

2 4 614

1

28

CASEEARTH

MODULETERMINAL

BLOCK

VIEWEDFROMREAR

NOTE3

CTCONNECTIONSARETYPICALONLY.

5 1 3 6 2 4

RL1-1

RL1-2

9

9 9tsecs

O

utput

C

ircuits

Power

Supply

Circuits

RL21

13

14

Vx

RL12

1

CaseEarth

SeeNote2

22

21

28

27

Directional

Control

xI

s

A B C

A B C

P1 S1

S2

P2

(SeeNote3)

A

B

C

PhaseRotation

A B C

AlternativeConnections

forCoreBalanceCT

2

7

28

A B C

27

28

AlternativeConnections

forN

eutralCT

ResetO

P

21

22

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Section 8 COMMISSIONING TEST RECORD

Date _________________________________

Station ___________________________________ Circuit _______________________________

Relay Model No. MCSU ____________________ Serial No. ____________________________

Rated current In 1A______ 5A _______ Frequency 50Hz__________ 60Hz _____

Time delayed range 0.1 to 9.9 seconds _______ 1 to 99 seconds _______

Auciliary supply voltage Vx AC _______ DC _______

30/34V _______ 48/54V_______ 63/70V _______ 110/125V ______ 110/127V ________

Test Results

3.1.2 Visual inspection ___________

3.2.2 Relay CT shorting switches ___________

3.2.3 Auxiliary supply _____________ V dc _________ ac ________

3.2.4 Current setting check

Time delay setting 1 second ____________ Multiplier setting 1.0 _____________

Tap setting % 0.5 1 2

Pick up current mA ______________ ______________ _____________

Tap setting % 4 8 Plug removed

Pick up current mA ______________ ______________ _____________

3.2.5 Multiplier

Tap setting __________ %

Multiplier 1.1 1.2 1.3 1.4 1.5

Pick up current mA ________ ________ ________ ________ ________

Multiplier 1.6 1.7 1.8 1.9

Pick up current mA ________ ________ ________ ________ ________

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3.2.6 Timing tests

Is _______ mA Applied current 110% Is

Timer setting 01 12 23 34 45

Actual time in seconds _______ _______ _______ _______ _______

Timer setting 56 67 78 89 90

Actual time in seconds _______ _______ _______ _______ _______

3.2.7 Final Setting

Is _______ % Tap setting ______ %

Multiplier 1. Timer ______ seconds

Pick up @ 105%I

s _______ Drop off @ 95%I

s ______Operating time _______ seconds ______

Flag operation/reset _______

Contact operation _______

Commissioning Engineer

Date

Customer Witness

Date

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REPAIR FORM

Please complete this form and return it to ALSTOM T&D Protection & Control Ltd with theequipment to be repaired. This form may also be used in the case of application queries.

ALSTOM T&D Protection & Control LtdSt. Leonards WorksStaffordST17 4LX,England

For: After Sales Service Department

Customer Ref: _________________________ Model No: __________________

ALSTOM Contract Ref: _________________________ Serial No: __________________

Date: _________________________

1. What parameters were in use at the time the fault occurred?

AC volts _____________ Main VT/Test set

DC volts _____________ Battery/Power supply

AC current _____________ Main CT/Test set

Frequency _____________2. Which type of test was being used? ____________________________________________

3. Were all the external components fitted where required? Yes/No(Delete as appropriate.)

4. List the relay settings being used

____________________________________________________________________________

____________________________________________________________________________

____________________________________________________________________________5. What did you expect to happen?

____________________________________________________________________________

____________________________________________________________________________

____________________________________________________________________________

____________________________________________________________________________

continued overleaf

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6. What did happen?

____________________________________________________________________________

____________________________________________________________________________

____________________________________________________________________________

____________________________________________________________________________

7. When did the fault occur?

Instant Yes/No Intermittent Yes/No

Time delayed Yes/No (Delete as appropriate).

By how long? ___________

8. What indications if any did the relay show?

____________________________________________________________________________

____________________________________________________________________________

____________________________________________________________________________

9. Was there any visual damage?

____________________________________________________________________________

____________________________________________________________________________

____________________________________________________________________________

10. Any other remarks which may be useful:

____________________________________________________________________________

____________________________________________________________________________

____________________________________________________________________________

______________________________________ _______________________________________

Signature Title

______________________________________ _______________________________________

Name (in capitals) Company name

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