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Vacuum Circuit-Breaker 3AH312 and 15 kV/31.5 and 40 kA24 kV / 25 kA and 36 kV/31.5 kA
Operating Instructions Manual
24
Contents Page
General ............................................................................................................................................................... 1
Technical data .................................................................................................................................................... 2Type designation ....................................................................................................................................... 2Rating plate ............................................................................................................................................... 2Standards and specifications .................................................................................................................... 2Ambient temperature/humidity and current loading .................................................................................. 2Site altitude ............................................................................................................................................... 3Electrical data ............................................................................................................................................ 3Operating times ........................................................................................................................................ 4Switching duties ........................................................................................................................................ 4Motor operating mechanism ..................................................................................................................... 4Auxiliary switch ......................................................................................................................................... 4Socket for low-voltage plug connector ...................................................................................................... 5Shunt closing release ................................................................................................................................ 5Shunt releases .......................................................................................................................................... 5Undervoltage release ................................................................................................................................ 5CT-Operated release .................................................................................................................................. 5Breaker tripping signal, cut-out switches (S6 and S7) ............................................................................... 5Varistor module ......................................................................................................................................... 5Electrical local closing/Electrical interlock .................................................................................................. 6Mechanical interlock .................................................................................................................................. 6Dimensions and weights ........................................................................................................................... 6
Description ........................................................................................................................................................ 7Construction .............................................................................................................................................. 7Vacuum interrupters ................................................................................................................................. 10Complement ............................................................................................................................................ 10
Installation ....................................................................................................................................................... 11Installing in cubicle or on truck ................................................................................................................. 11Flat bar connection ................................................................................................................................... 11Control leads ............................................................................................................................................12Earthing ....................................................................................................................................................12Circuit documents ....................................................................................................................................12Function schematic diagram................................................................................................................ 13/14
Operation .......................................................................................................................................................15Commissioning.........................................................................................................................................15Charging the closing spring ......................................................................................................................16Closing .....................................................................................................................................................16Tripping .....................................................................................................................................................16Disposal of the product ............................................................................................................................16
Maintenance ..................................................................................................................................................... 17Safety measures ...................................................................................................................................... 17Servicing ................................................................................................................................................... 17Checking the contact systems .................................................................................................................19Checking the vacuum ...............................................................................................................................19Accessories and spare parts ................................................................................................................... 20List of spares .......................................................................................................................................... 20Central legend ......................................................................................................................................... 21Troubleshooting ....................................................................................................................................... 22
Subject to change due to improved design.
Notes: 1. The items numbers shown in the Figures are explained in the central legend (refer page 23).
2. When ordering the Operating Instructions Manual, please quote the Order No. 4P-0502-03-98120-001.
1
Warning
This equipment contains hazardous voltages andmechanical parts which move at high speed andmay be controlled remotely.
Non-observance of the safety instructions can resultin severe personal injury or property damage.
Only qualified personnel should work on or aroundthis equipment after becoming thoroughly familiarwith all warnings, safety notices and maintenanceprocedures contained herein.
The successful and safe operation of thisequipment is dependent on proper handling,installation, operation and maintenance.
General:
Siemens 3AH3 vacuum circuit-breakers (VCBs) are oftriple-pole indoor type for rated voltages between12 and 36 kV.
The vacuum circuit-breaker consists of the mechanismhousing complete with stored-energy mechanism andcontrol elements, the three poles with vacuuminterrupters, six cast resin insulators and threeswitching bars.
The mounting position (relative to the vacuuminterrupters) is vertical. The vacuum circuit-breakerscan be used in practically any system design.
Under normal operating conditions, the vacuum circuit-breaker is maintenance free.
Attention
In their basic design and with all standard listedequipment options, 3AH3 vacuum circuit breakersare type tested components in accordance withrelevant IEC/IS. If any attachments or installations,e.g. interlocking components in connection withswitchgear, are made to the breakers at a laterstage, it must be ensured that fast moving parts arenot loaded additionally by masses or forces and thatany added parts have an adequate clearanceparticularly from moving and live parts.
If you intend to fit the breakers with additionalfunctions, we recommend that you should firstconsult us as in most cases proven and testedsolutions are already available.
2
Technical data
Type designation
3AH3 vacuum circuit-breakers are identified by amachine-readable product designation made up of aseries of figures and letters.
Ambient temperature/humidity and current loading
The 3AH3 VCBs are designed for the normal operatingconditions laid down in the standards. Permissibleambient temperatures:
Maximum value = +40oC
Average over a period of 24 hours = +35oC
Minimum value = –5oC
Permissible atmospheric humidity:
Relative humidity, 24 hour mean = max. 95%
Relative humidity, 1 month mean = max. 90%
Under these conditions condensation mayoccasionally occur. The rated normal currents listed inFig. 1/4 were laid down for 40oC ambient inaccordance with IS/IEC. Use under conditions otherthan normal is possible with certain measures that canbe implemented on request.
The maximum permissible load current as a functionof the breaker ambient temperature has been plottedin Fig. 1/2. The load currents indicated apply to open-type switchgear. Metal-enclosed switchgear must bederated as specified by the switchgear manufacturer.
Determination of the load characteristics number
Rated normal current Load characteristics number
1250 A 1
1600 A 2
2000 A 3
2500 A 4
3150 A 5
Basic type
Rated voltage code,design code
Rated short circuitbreaking current code
Rated normal currentcode
3 A H 3 1 1 5 - 2
Rating plate
The rating plate contains the following information:
8 Weight
9 Rated operating sequence
10 Rated frequency
11 Rated lightning impulsewithstand voltage
12 Rated short-circuitbreaking current
13 Rated voltage
Fig. 1/1 Rating plate
Note : In the event of any queries, state the typedesignation (2), design code (4) and the serial number(3).
Standard specifications
The 3AH3 vacuum circuit-breakers comply with theprovisions of IS 13118, IEC 60056, IEC 60694. TheVCBs rated for 15 kV meet the requirements of theAmerican standards ANSI C37 with respect to theirinsulating capacity.
1 Manufacturer
2 Type designation
3 Serial number
4 Design code
5 Year of manufacture
6 Rated normal current
7 Rated short-circuitduration
Fig. 1/2 Maximum permissible load current as afunction of the ambient temperature
sType 2 Design Code 4
Sr. No. 3 Year of Manuf. 5
Un 13 kV 50 Hz 10 Ir 6 A
Isc 12 kA tk 7 S
Up 11 kV m 8 kg
9 Rated operating duty 0-0.3s-CO-3min-CO
MADE IN INDIA70 0107746 001
1
60020
Ambient temp4030 50 60 OC
1000
1400
1800
2200
2600
3000
5
3
4
2
1
3400
3800
4200
4600A
Load
Cu
ure
nt
3
Site altitude
The rated insulating capacity values (rated impulsewithstand voltage, rated power frequency withstandvoltage)1) specified for the equipment are, in accordancewith the provisions of IEC Publication 71, based onstandard atmospheric conditions (1013 h Pa, 20oC and 11 g/m3 water content). i.e. sea level. The insulatingcapacity of an insulation in air decreases with increasingaltitude as a result of decrease in the air density.Standards promulgated by VDE, IEC and other disregardthis decrease in insulating capacity for altitude of up to1000m, i.e. the decrease of approximately 9% at thisaltitude is still permissible.
The standards provide no guideline for altitudes of morethan 1000 m with respect to insulation ratings; they leavethis up to an agreement between manufacturer and user.
Our own recommendation is as follows:
Since this method used for insulation rating up to altitudesof 1000 m has proved to be satisfactory, it should alsobe applied to higher altitudes. The altitude correctionfactor “a” should therefore be based on the insulatingcapacity at 1000 m, which is lower by 9% (correspondingto 0.91 or 1/1.1) than the capacity at sea level.
The following expression thus applies for the selectionof the equipment:Rated withstand voltage to be selected2)
Required withstand voltage 2)>=
1.1 x aExample:
Site altitude above sea level ............................. 3000 m
Required impulse withstand voltage ................... 95 kV(for a 15 kV system according to ANSI)
Correction factor a ................................................ 0,73(according to Fig. 1/3)
Rated impulse withstand 95 kVvoltage to be selected ≥ ≥ 118 kV
1.1 x 0.73
Switchgear with rated voltage of 24 kV, IEC List 2(rated lightning impulse withstand voltage of 125 kV)meets this requirement.
The actual insulating capacity at the site is then
withstand voltage 3) = a • rated withstand voltage2) ofthe selected switchgear unit.
Fig. 1/3 Relationship between the correction factor“a” and the site altitude
The following definitions apply:1) Rated withstand voltage2) = required value corresponding to
the provisions of IS, IEC etc. for sea level.Withstand voltage3) = actual value for the given altitude
2) Rated lightning impulse withstand voltageRated power frequency withstand voltage
3) Lightning impulse withstand voltagePower frequency withstand voltage
Electrical data : 3AH3 vacuum circuit-breaker1 2 3 4 5 6 7 8 9 10 11kV kV kV kA s 1250A 1600A 2000A 2500A 3150A kA % mm MLFB
80 32 210 EK 3AH3 115-231.5 3 80 32 210 EK 3AH3 115-4
80 32 210 EK 3AH3 115-6100 32 210 EU 3AH3 116-212 75 28100 32 210 EU 3AH3 116-3
40 3 100 32 210 EU 3AH3 116-4100 32 210 EU 3AH3 116-6100 32 210 EU 3AH3 116-780 32 210 EK 3AH3 165-2
31.5 3 80 32 210 EK 3AH3 165-480 32 210 EK 3AH3 165-6100 32 210 EK 3AH3 166-215 95 36100 32 210 EU 3AH3 166-3
40 3 100 32 210 EU 3AH3 166-4100 32 210 EK 3AH3 166-6100 32 210 EU 3AH3 166-7
24 125 50 25 3 63 32 275 EK 3AH3 284-263 32 275 EK 3AH3 284-480 27 300 EK 3AH3 315-2
36 170 70 31.5 3 80 27 300 EK 3AH3 315-480 27 300 EK 3AH3 315-6
Remark : available
1 Rated voltage (maximum permissible system voltage) at 50 to 60 Hz2 Rated lightning impulse withstand voltage (peak voltage)3 Rated power frequency withstand voltage (RMS value for 1 min.)4 Rated short circuit current5 Rated short circuit duration6 Rated normal current
7 Rated short circuit making current8 DC component of rated short - circuit breaking current9 Pole centre distance
10 Switching duties U = Rapid load transferK = Rapid auto-reclosure + UE = Electrical operating energy
11 Type designation
Fig. 1/4 Electrical data of 3AH3 vacuum circuit-breakers
Co
rrec
tio
n F
acto
r 'a
'Altitude of site above sea level
0.1
1000 2000 3000 4000 5000 m
0.5
0.6
0.7
0.8
0.9
1.0
4
Operating times
Closing time ...................................................................................................................................... ms < 80Spring charging time ............................................................................................................................ s < 15Opening time ......................... with first shunt release 3AY15 10 (Y1) .............................................. ms < 65— do — ................................ with supplementary (second) shunt release 3AY15 10 (Y3) .............. ms < 65— do — ................................ with supplementary shunt release 3AX11 (Y2/Y4/Y7) ...................... ms < 45
Arcing time ........................................................................................................................................ ms < 15Break time .............................. with first shunt release 3AY15 10 (Y1) .............................................. ms < 80Break time .............................. with second shunt release 3AY15 10 (Y3) ......................................... ms < 80— do — ................................ with supplementary shunt release 3AX11 (Y2/Y4/Y7) ...................... ms < 60
Dead time.......................................................................................................................................... ms 300Close-open-time ..................... with shunt release 3AY15 10 (Y1) ..................................................... ms < 90Close-open-time ..................... with supplementary (second) shunt release 3AY15 10 (Y3) .............. ms < 90Close-open-time ..................... with supplementary shunt release 3AX11 (Y2/Y4/Y7) ...................... ms < 70
Minimum pulse duration...... “Close” .......................... with closing release 3AY15 10 (Y9) .................................................... ms < 45...... “Open” ........................... with first shunt release 3AY15 10 (Y1) ............................................... ms < 40...... “Open” ........................... with second shunt release 3AY15 10 (Y3) ......................................... ms < 40...... “Open” ........................... with supplementary shunt release 3AX11 (Y2/Y4/Y7) ...................... ms < 20
Shortest pulse duration of breaker tripping signal for first shunt release .......................................... ms > 15
Shortest pulse duration of breaker tripping signal for second shunt release ..................................... ms > 15
Shortest pulse duration of breaker tripping signal for third shunt release ......................................... ms > 10
Fig. 1/5 Operating times
Closing time = the interval of time between theinitiation of the closing operation and the instant whenthe contacts touch in all poles.
Opening time = the interval of time between theinitiation of the opening operation and the instantwhen the contacts separate in all poles.
Arcing time = the interval of time between the instantof the first initiation of an arc and the instant of finalarc extinction in all poles.
Break time = the interval of time between thebeginning of the opening time of a circuit-breaker andthe end of the arcing time.
Dead time = time from the end of the current flow inall poles up to the beginning of the current flow in thefirst pole
Close-open time = the interval of time (in a make-break operating cycle) between the instant when thecontacts touch in the first pole in the closing process,and the instant when the arcing contacts separate inall poles in the subsequent opening process.
Switching duties
The operating mechanisms of the 3AH3 circuit-breakers are suitable for rapid auto-reclosure. Breakersfor a rated short-circuit breaking current of 40 kA are,at rated data levels, suitable for rapid load transfer andtill 31.5 kA for rapid auto-reclosure.
Motor operating mechanism (M1)
The maximum DC power input is 770 W (approx.). Themaximum AC power input is 900 VA (approx.). Duringpart of the short spring charging time the motorsoperate in the overload range. The recommendedratings for motor protection devices are shown inFig.1/6 (the protection devices are not supplied withthe vacuum breakers and must be orderedseparately).
DC 220 V/Rated supply voltage DC 24 V DC 48 V DC 60 V DC/AC 110 V AC 230 V
50/60 Hz 50/60 Hz
Recommended rating of16 A 8A 6A 5A1) 2.5 A1)
protection device*)
*) MCB with G characteristic.1) Also lower values are applicable : 3A/1.6A
Fig. 1/6 Rated currents of motor protection devices
The supply voltage may deviate from the rated valueby - 15% to + 10%.
Auxiliary switch (S1) 3SV92
Two versions of the auxiliary switch can be supplied.The standard version is fitted with 6 NO contacts and6 NC contacts. The extended version is fitted with 12NO contacts and 12 NC contacts.Rated voltage : AC/DC 250 VInsulation class : CCurrent : 10 AMaking capacity : 50 A
5
Socket for low-voltage plug connector (X0)
The control elements of the 3AH3 vacuum circuit-breaker provided in the mechanism housing are wiredfor external connection to the socket (X0). The breakeris provided with either 32-pins or 64-pins.
Closing release (Y9) 3AY1510
The closing solenoid unlatches the charged closingspring and thus closes the circuit-breaker electrically. Itis available for both AC and DC operation. Aftercompletion of a closing operation, the closing solenoidis de-energized internally. In operation with AC voltage,a rectifier module 3AX1525 is installed in the circuit-breaker.
Power consumption 200 W/VA
Shunt releases (shunt opening releases)
The shunt releases are used for automatic tripping ofcircuit-breakers by means of appropriate protectiverelays and for deliberate tripping by other electricalmeans. They are designed for connection to externalvoltage (DC or AC voltage). In special cases, fordeliberate tripping, they can also be connected to avoltage transformer.
Shunt releases based on two different operatingprinciples are used.
Basic 1st Shunt release (Y1) 3AY1510
The 3AY1510 shunt release is used as standard in thebasic circuit-breaker version. With this design, theelectrically supplied tripping pulse is passed to the“Open” latching mechanism by means of a direct-action solenoid armature and the circuit-breaker is thusopened. It is available for both AC and DC operation.After completion of a opening operation, the 3AY1510shunt release is de-energized internally. In operationwith AC voltage, a rectifier module 3AX1525 isinstalled in the circuit-breaker.
Power consumption 200 W/VA
Supplementary 2nd Shunt release (Y3) 3AY15 10*)
This release is used if more than one shunt release isrequired to ensure opening of the breaker in case offailure of first shunt release. The voltage of this releasehence can be same or different than first shunt
release. This release is dimensionally & functionallysame as first shunt release.
Power consumption 200W/VA
Supplementary 2nd Shunt release (Y2) 3AX1101*)
The 3AX1101 shunt release is fitted if more than oneshunt release is required. With its design, the electricalopening command is transfered in boosted form tothe “Open” latching mechanism via a solenoidarmature through unlatching of a energy store andthus, the circuit-breaker is opened. The stored energymechanism is automatically recharged by the circuit-breaker.
Power consumption ≤ 60 W or ≤ 55 VA
Supplementary Under voltage release (Y7)3AX1103*)
Undervoltage release consist of a stored-energymechanism, an unlatching mechanism and anelectromagnet system which is connectedcontinuously to the supply when the circuit-breaker isin the close state. If this voltage drops to belowcertain value, the unlatching mechanism is releasedand opening of the circuit-breaker is thus initiated viathe stored-energy mechanism. The stored energymechanism is automatically recharged by the circuit-breaker.
The deliberate tripping of the undervoltage releasegenerally takes place via an NC contact in the trippingcircuit. But it can also be carried out via an NO contactby short-circuiting of the magnet coil. With this type oftripping, the short-circuit current is limited by the built-in resistors.
Undervoltage release can also be connected tovoltage transformers. When the operating voltagedrops to impermissible low levels, the circuit-breakeris tripped automatically. Power consumption ≤ 6.5 Wor ≤ 7.5 VA
CT-Operated release (Y4, Y5) 3AX1102*)
CT-operated releases consist of a stored-energymechanism, an unlatching mechanism and anelectromagnet system. When the tripping current isexceeded (90% of the CT-operated release ratedcurrent) the unlatching device of the stored-energy
Breaking capacity
AC 40 upto 60 Hz DC
Supply Voltage Operational current Supply Voltage Operational currentU (V) I (A) U (V) I (A)
Resistive load Inductive load (T=20 ms)
24 10 10
48 10 9
up to 230 10 60 9 7
110 5 4
220 2.5 2
Fig. 1/7 Breaking capacity of 3SV92 aux. switch
6
mechanism is released and thus opening of thecircuit-breaker is initiated. The stored energymechanism is automatically recharged by the circuit-breaker. In addition to the primary currenttransformers, matching transformers are required forapplication of the CT-operated releases.
Power consumption for 0.5 A and 1 A ≤ 6 VA at 90%of the rated current and with open armature.
CT-operated release (Y6) 3AX 1104*)
(Low-energy release 0.1 Ws)
In connection with a solid-state release (7SJ41overcurrent time protection or similar) and low-powerprimary current transformers (window-typetransformers), it is possible with the 3AX1104 tocreate a CT-operated release without additional supplyvoltage.
The 3AX1104 is of similar design as the 3AX1101/1102releases. With its coil data and its low energyrequirement of ≤ 0.1 Ws, it is designed to be directlyactuated by a release impulse provided by a capacitorof the above-mentioned electronic release systems.
Breaker tripping signal, cut-out switches (S6 andS7)
When the vacuum circuit breaker is tripped by meansof a release, the position switch S6 briefly makescontact. This contact making can be used for signalling.In the event of intentional mechanical tripping, the cut-out switch S7 breaks this contact.
Varistor module 3AX1526
The disconnection of inductive loads in DC circuitsmay cause switching overvoltages which pose a riskto electronic control units. In order to prevent this, theinductances of the circuit-breaker mechanism andcontrol (motor, closing solenoid, shunt release andauxiliary contactor) can be connected to Varistor (with
DC operation). For rated operating voltages of 60 V to250 V DC the varistor module 3AX 1526 is available asan accessory; it limits the overvoltages to about 500 V.The module contains 2 separate varistor circuits.
Electrical local closing/electrical Interlocking
In the basic version, the closing spring must bereleased mechanically if the breaker is to be closedlocally. A version with electrical local closing can alsobe supplied. In this version, the making circuit of thecircuit-breaker is activated electrically via a push-button. In this way, allowance can also be made forstation-specific interlocks, and undesired makingoperations prevented. For example, interlocking of thecircuit-breaker is possible via the auxiliary contact of adisconnector.
Circuit-breakers with electrical local closing cannot beclosed mechanically.
Mechanical interlocking 3AX1520-2C
The sensing parts of the substation check the switchposition of the circuit-breaker and prevent it fromclosing mechanically and electrically if the associateddisconnector is not in a position to allow safeoperation. On the other hand, the disconnector isprevented from being operated when the circuit-breaker is closed.
The mechanical interlocking facility can also be used tointerlock breaker trucks of draw-out breaker parts.
Dimensions and weights
The dimensions and weights of the vacuum circuit-breaker are shown in the relevant drawings.
For planning purposes, the drawings showing detailedoverall dimensions, can be ordered through theappropriate Siemens agency.
The weight is also stated on the breaker rating plate.
*) Can be ordered on request, retrofitting possible.
Release combinations
Basic Equipment Supplementary release (at additional cost)
Closing 1st Opening 2nd 2nd under- C.T. MLFB No.release release Opening Opening voltage operated at 9th
3AY15 10 3AY15 10 release release release release position3AY15 10 3AX1101 3AX1103 3AX1102
Y9 Y1 Y3 Y2 Y7 Y4
1 1 A
1 1 1 E
1 1 1 B
1 1 1 1 H
1 1 1 1 D
1 1 1 F
1 1 1 1 G
1 1 1 C
7
Description
Construction
The vacuum circuit-breaker consists of themechanism housing (60.), the 3-pole assemblies withvacuum interrupters (30.), cast-resin post insulators(16.1 and 16.2) FRP bars (28.) and the switching bars(48.) with contact pressure springs (49.).
Each of the three pole assemblies is supported bytwo cast-resin post insulators (16.1 and 16.2), whichare bolted to the rails / mounting plate (15).
The main features of the 3AH3 vacuum circuit-breakerare shown in Fig. 2/1.
The mechanism housing (60.) accommodates allelectrical and mechanical elements required foropening and closing the vacuum circuit-breaker.Fig. 2/2 shows the arrangement of the individualmodules in the mechanism housing.
The mechanism housing has a detachable cover 60.1(Fig. 2/3).
This cover (60.1) has cutouts for the actuating andindicating devices.
The vacuum circuit-breaker can be closed by means ofthe press knob (53.). The motor (50.4) immediatelyrecharges the closing spring (62.). In the event ofmotor power supply failure, the closing spring can becharged by means of a hand crank (50.). The coverincludes an opening (50.1) for the hand crank, behindwhich the hand crank coupling (50.5) of the gear box(50.2) is located. The stored-energy mechanism stateis shown by the indicator (55.). The indicator (59.)shows the breaker state (ON - OFF). The operatingcycle counter (58.) indicates the number of ON-OFFcharging operations. The rating plate (51.) is attached tothe gear box but is visible through an opening (51.1) inthe cover.
The movement of the switching shaft is transmitted tothe pole assemblies via switching bars (48.).
Fig. 2/1 3AH3 vacuum circuit - breaker
20. 16.1 60.2 60.
15.
30.
28.
40.
48. 16.2 49.
8
Fig. 2/2 View of an open mechanism housing
Fig. 2/3 Actuating and indicating devices
51.
50.4 61. 66.
58.
59.
55.
50.4.1
50.2
62.
60.
68.7.1
69.
68. or 68.0.1
53.154.1
54.2, 54.3, 54.4
68.1
63.
51.1
50.1
59.1
55.1
58.1
54.
53.
60.1
TighteningTorque 10 Nm
9
The pole assembly consists of the top flange (20.)with the upper terminal (27.), the vacuum interrupter(30.), the bottom flange (40.) with the lower terminal(29.) the terminal (29.2.) with the current link (29.1.)
and the angled lever (48.6.). The central part (28.1.)and the FRP bars (28.) relieve the vacuum interruptersof external forces, see (Fig. 2/4).
Fig. 2/4 3AH3 pole assembly
20.
27.
28.
30.
28.1
29.2
29.1
29.
40. 48.6
10
Vacuum interrupters
The basic construction of the vacuum interrupters forthe 3AH3 vacuum circuit-breaker is shown in thesectional view in Fig. 2/5.
The vacuum interrupter (30.) is fixed to the top flange(20. Fig. 2/4). The fixed contact stem (31.1) isconnected directly with the interrupter housing. Themoving contact (36.) is fixed to the moving contactstem (36.1) and is located centrally in the movingcontact guide (35.). The metallic bellows (34.) forms
the vacuum-proof connection to the interrupterhousing.
The vacuum interrupters fitted in the 3AH3 vacuumcircuit-breakers are type-approved in accordance withthe X-ray regulations of the Federal Republic ofGermany. They conform to the requirements of theX-ray regulations of January 8, 1987 (Federal LawGazette Page 144) 8 and Annex III Section 5 up torated short-time AC voltage stipulated in accordancewith DIN VDE/IEC.
Fig. 2/5 Vacuum interrupter
Complement
The basic version of the vacuum circuit-breakercomprises:– Electrical operating mechanism (charging motor)
with electrical anti-pumping feature ................. (M1)– Closing release ................................................. (Y9)– 1st Shunt release ............................................. (Y1)– Socket for low-voltage plug connector, 32-pins (X0)– Auxiliary switch, 6NO + 6NC ............................ (S1)– Position switch for signalling
“Closing spring charged” ............................... (S41)– Operating cycle counter
Each 3AH3 vacuum circuit-breaker can be alsooptionally equipped with the following devices:– Low voltage-64 terminal socket ........................ (X0)– Extended auxiliary switch 12NO + 12NC .......... (S1)
– 2nd shunt release 3AY15 10 ............................. (Y3)– 2nd Shunt release 3AX 1101 ............................. (Y2)– Current transformer-operated release
3AX 1102 ..................................................... (Y4,Y5)– Current transformer-operated release
3AX1104 (0.1 Ws) .............................................. (Y6)– Undervoltage release 3AX 1103 ........................ (Y7)– Breaker tripping signal, cut-out switches .... (S6, S7)– Mechanical interlock with truck
In addition to the standard shunt release (Y1), the3AH3 vacuum circuit-breaker can be fitted withmaximum of two releases of type 3AX 11.
The permissible combinations of supplementaryequipment and special versions are stated on page 7.
31.1
32.
31.
36.
34.
32.
35.
36.1
11
Installation
Installing in a cubicle or on a truck
The 3AH3 vacuum circuit-breakers are supplied in theopen state with the “Closing spring discharged”indication (55.). Before installing the 3AH3 VCB,remove the transport devices (skids and spacers).Mount loose supplied phase barriers in accordancewith the instructions.
Before installing the 3AH3 vacuum circuit-breaker in acubicle or on a truck, check its rating plate data andcompare the rated supply voltage indicated in thedelivery papers with the control supply available at thesite.
On the vacuum circuit-breaker with undervoltagerelease (Y7) 3AX1103, the arresting screw of thehammer must be moved from position A to B (seenote card in mechanism housing [60.] of vacuumcircuit-breaker).
On the mounting plate or the rails (15.) and on themechanism housing (60.), there are a total of 14 fixingholes - to suit the various types of installation (Fig. 3/1).Use M12 fixing bolts - strength class 8 - makingreference to the mandatory dimension drawings.
The rack or frame must be adapted to the operatingconditions and have adequate load bearing capacityand stability.
Flat bar connection
Prior to fitting the connections, ensure smooth contactwith their connecting parts and the holes in fullalignment. When the busbar or the contact arms(isolating contacts) are fitted, the voltage strengthbetween the top and bottom flanges must not bereduced (e.g. by reduction in the air clearance).
Rub the contact faces of busbars to be boltedtogether with criss-crossing strokes using a wire brushuntil bright metal shows and wipe them with a cleanrag.
Note! Copper-sprayed or silver-plated surfaces shouldbe cleaned with a cloth and not rubbed.
Different contact materials (AI/Cu) must not be workedwith the same cleaning tool. Thinly grease the brightcontact faces with acid-free Vaseline (e.g. ShellVaseline 8420) or equivalent anti-corrosion agent andbolt them together immediately.
Note: Silver-plated parts must not be bolted togetherwith aluminum busbars.
Use appropriate M12 nuts and bolts of strength class8 and corresponding spring elements and plainwashers.
Note! When tightening the terminal screws,counteract the torque (70 Nm ~ 7 mkp) by resisting itwith a suitable spanner or socket wrench.
Fig. 3/1 Means of fixing 3AH3 vacuum circuit-breaker
15. Y
Z
View Y
60
View Z* Holes for M12 bolts
12
Control leads
Vacuum circuit-breakers of standard design areprovided with a 32/64-pole low-voltage socketconnector (X0) (68.7.1). The corresponding plug forexternal connection is designed for crimp connectionof control leads with a nominal sectional area of 1.5mm2. Use a suitable crimping tool.
Earthing
Connect the vacuum circuit-breaker to the appropriatehigh voltage protective earth by means of the suitablemarked M12 (70.) (see Fig. 3/2) terminal on the side ofthe mechanism housing (60.) using flat copper, coppercable or hot galvanized steel strip.
If the VCB with the mechanism housing is installed inan earth metal rack so that firm electrical contact isestablished, the mechanism housing need not beearthed separately. When installing the breakerexternally, teethed serrated washers (DIN 6798) mustthen be placed under the bolt heads.
Circuit documents
The wiring of circuit-breakers is shown in the circuitdiagram supplied, depending on the equipment.
Typical circuit diagrams for circuit-breakers are shownin Fig. 3/3 and 3/5.
Fig. 3/2 Earthing of VCB
70
13
Function schematic diagram
Fig. 3/3 3AH3 VCB with manual closing with 64-pinsocket.
Fig. 3/4 Remaining contacts of aux. switch(6NO + 6NC)
HA Manual trippingHE Manual closingK1 Anti-pumping contactorM1 Motor operating mechanismP Energy storeS1 Auxiliary switchS21, S22 Position switches (cut-out motor after charging of
closing spring)S3 Position switch (opens when closing spring charged)S4 Position switch (signals charged state of closing
spring)X0 Socket of low-voltage plug connectorY1 1st Shunt releaseY2/Y3 2nd Shunt releaseY4 CT operated releaseY7 Undervoltage releaseY9 Closing releaseS16 Aux. switch (operates in test & service positions) is
mounted on VCB truckV1 - V3 Rectifiers for motor, tripping / closing releases
14
Function schematic diagram
HA Manual trippingHE Manual ClosingK1 Anti-pumping contactorM1 Motor operating mechanismP Energy storeS1 Auxiliary switchS21, S22 Position switches (cut-out motor after charging of
closing spring)S3 Position switch (opens when closing spring charged)S4 Position switches (signals charged state of closing
spring)X0 Socket for low-voltage plug connectorY1 1st Shunt releaseY2/Y3 2nd Shunt releaseY4 CT operated releaseY7 Undervoltage releaseY9 Closing releaseS16 Aux. switch (operates in test & service positions) is
mounted on VCB truckV1 - V3 Rectifiers for motor, tripping / closing releases
Fig. 3/5 3AH3 VCB with electrical manual closingwith 64-pin socket.
Fig. 3/6 Extended aux. switch (12NO + 12NC)
15
Operation
Danger
High voltage!
Touching of live parts will result in death or severepersonal injury.
This equipment shall be operated only by qualifiedpersonnel after becoming thoroughly familiar withthe operating instruction manual and in particular allsafety instructions.
Warning
This equipment contains hazardous voltages andmechanical parts which move at high speed andmay be controlled remotely.
Non-observance of the safety instructions can resultin severe personal injury or property damage.
In particular:Do not remove the cover (60.1). Do not reach insideany openings in the operating mechanism. Do nottouch pole assemblies (19.) and switching bars(48.).
Commissioning
Prior to commissioning, check the VCB in accordancewith the following points:
1. Clean them as applicable (for details refer to“Cleaning” fig. 5/1).
2. Check all fixing and terminal screws for tightness.
3. Examine the circuit-breaker for any externaldamage, especially to the control leads, postinsulators and interrupters.
Caution
The VCB may be operated only with the originalhand crank (50.), in order to avoid injuries as a resultof the motor suddenly starting up.
4. Charge the closing spring (62.) with the hand crank(50.) (see Fig. 4/1), press the “close” press knob(53.) and after closing, trip the breaker by pressingthe “open” press knob (54.).
On the 3AH3 V-breaker with undervoltage release (Y7)3AX1103, the arresting screw of the hammer must bemoved from position A to B (see note card inmechanism housing [60.] of 3AH3 vacuum circuit-breaker).
5. For test operations with the motor mechanismswitch on the closing spring (62.). Check the
mechanical and electrical indication of the chargingstate of the closing spring. Actuate the mechanismas indicated under 4. and check the mechanical andelectrical state indication.
6. Check the auxiliary switch S1 (68.) and snapswitches (50.4.1) electrically in both end positionsby actuating the vacuum breaker.
7. Also check-by electrical actuation-the function ofthe closing solenoid (Y9) (53.1) and all fitted shuntreleases.
When correct functioning of the VCB has beenascertained to, it can be put into service.
16
Charging the closing spring
When the supply voltage is applied, the motor (50.4)automatically charges the closing spring (62.) Shouldthe power supply fail, the closing spring can also becharged by hand crank (50.). In the latter case, asshown in Fig. 4/1, the hand crank (50.) is inserted withthe forwards pushed adapter (50.6) through theopening (50.1) onto hand crank coupling (50.5) andturned clockwise, until the symbol “Closing springdischarged” shown in the indicator opening (55.1) ischanged to “Closing spring charged” (Fig. 4/2).
The adapter (50.6) is designed so that the hand crank(50.) is decoupled on the recovery of the motor supply.
Closing
If operation is not blocked by the mechanical interlock,
Fig. 4/2 “Closing spring charged”
Fig. 4/1 Charging the closing spring with the hand crank.
press the “Close” press knob (53.) or thecorresponding control switch until the 3AH3 vacuumcircuit-breaker closes and signals this state.
After closing (and, if applicable, releasing of the“Close” press knob (53.), the closing spring (62.) isimmediately and automatically recharged by the motoroperating mechanism and the “closing springcharged” (55.) indication becomes visible.
Tripping
The opening spring (64., Fig. 2/2) is charged duringclosing.
To trip the breaker press the “Open” press knob (54.)or corresponding control switch until the VCB trips andsignals this state.
50.5 50.
50.6
50.1
55.1 54.
53.
50.
Disposal of the product
The product is environmentally compatible.
The following materials have been used to make upthe device: steel, copper, aluminium, cast-resin, glass-fibre-reinforced thermoplastics, rubber, porcelain,greases etc. PVC is used as an insulation material forcontrol wires.
In as-supplied condition, the product does notincorporate any hazardous substances.
In operation, the product does not emit any hazardousmaterials or gases.
During disposal of the product, care must be taken todismantle as far as possible in more environmentallyaccepted way as recyclable & non-cyclable scraps i.e.steel, copper, aluminium, rubber, PVC, cast-resin &glass-fibre-reinforced materials segregated properly.
The cyclable materials like steel, copper, aluminiumcan be reused. Non cyclable materials like cast-resins,glass-fibre-reinforced etc can be broken in to pieces &then used as land filling materials.
Local customer support-Siemens office will be able toanswer any questions concerning disposal.
17
Maintenance
Safety measures
Danger
Maintenance, repair and subsequent conversionwork may be carried out only by specially trainedpersonnel in accordance with the operatinginstructions and/or special conversions instructions.Training and information sessions for personnel canbe provided by the competent Siemensdepartment.
Before starting any work on VCBs, reference mustbe made to the local safety regulations for high-voltage switchgear. Switch off the power supply andthen close and open the V-breaker by hand (vacuumcircuit-breaker in open state “closing springdischarged” indication visible).
Non-observance can result in death, severepersonal injury or substantial property damage.
Servicing
General
The 3AH3 vacuum circuit-breakers are maintenance-free up to 10,000 operating cycles. By virtue of theirdesign and a special routine testing process they canbe used for up at least 30,000 cycles. In order touphold the high level of reliability throughout the entireoperating life, we recommend regular maintenanceafter every 10,000 operating cycles. The scope ofmaintenance work depends on the following operatingconditions:
• Ambient conditions (temperature, air humidity, etc.)
• Continuous current stress
• Number of electrical operating cycles
• Number of mechanical operating cycles
The following table lists the necessary work:
Maintenance schedule
Sequence Work Materials Frequency Remarks No.
1. Circuit-Breaker1.1 Visual inspection and
cleaning if necessary – X –1.1 Clean insulating components – Warm water,
and breaker external parts – Household detergent X See note 1)1.2 Grease bearings and sliding
surfaces as shown in Fig. 5/2. See Fig. 5/2Perform 3 to 5 test – Isoflex Topas L32 X Note 2operations of ON/OFF. grease Note 3
– Ritzol Rostschutz 7-2 oil
2. Breaker pole2.1 Replace vacuum interrupters X While ordering
replacement interrupters,state CB type, design codeand serial number(see rating plate)
3. Breaker operating mechanism Note 43.1 Replace motor M1 X3.2 Replace closing spring X
4. Examine and replace if necessary Note 5/Note 64.1 All electrical devices in the drive X4.2 Check all cable X4.3 Leaking of shock-absorber X
Fig. 5/1
Notes:
If re
quire
d
10,0
00 m
ech.
oper
atin
g cy
cles
30,0
00 m
ech.
oper
atin
g cy
cles
1) If the 3AH3 vacuum circuit-breaker is used inunfavourable indoor conditions (strong, frequentmoisture condensation, dust-laden air etc.), we
recommend that the insulating parts and, ifnecessary, the external breaker parts be regularlycleaned at frequent intervals.
18
2) Joints and bearings which cannot be dismantledmust not be treated with a cleaning agent prior toreapplication of anticorrosives.
3) Lubricants:
– Bearings, sliding surfaces:
Isoflex Topas L 32
– Bearings inaccessible to grease and bearings ofthe auxiliary switch S1:
Ritzol Rostschutz
Lubricants (for special requirement) are availablefrom the Siemens agency on enquiry.
4) The securing fastners used on all replaced partsmust also be renewed (spring washers, lockwashers, splints, etc.).
An assortment of securing fastners are offered bySiemens Representative Office.Order number 3AY1550-0A
5) The snap switches must not be fitted too tightly;i.e. the plunger of the position switch must movefreely.
6) Replace only if necessary, e.g. if the switchingtimes are no longer complied with or mechanicaldamage has occurred.
Fig. 5/2
Key to parts
a Lever for snap switch operation
b Bearing for lever
c Cam disc
d Lever for switch-on block
e Lever for operating the auxiliaryswitch
f Auxiliary switch
g Guide for opening spring
h Operating rod of auxiliary switch
j Bearing for switching shaft
k Lever for switch-off block
I Lever on the switching shaft
m Damping plate
p Pin for opening spring
Isoflex Topas L32 grease
Ritzol Rostschutz Oil
da cb
e
f
g
h
i
klmp
j
19
Checking the contact system
The contact system is subject to wear by contacterosion as well as compression of the fixed & movingcontacts and the stems. To check the contact wear,the moving contact stem (36.1) of the vacuuminterrupter (30). is provided with the check mark(13.9) Fig. 5/3. As long as the check mark is wholly orpartially visible when the 3AH3 vacuum circuit-breakeris closed, the shortening of the contacts is within thepermissible range. If in exceptional cases the checkmark is no longer visible, but the interrupter has notyet reached the end of its electrical life, a new markcan be made, after resetting the stroke of theinterrupter to nominal. Please contact your nearestSiemens office. Fig. 5/4 Lower pole support with switching bar
Fig. 5/5
The atmospheric pressure will force the movingcontact of a hermetically sealed interrupter into the“On” position, causing lever 48.6 to move into theposition shown in Fig. 5/5
Fig. 5/6
A vacuum interrupter may be assumed to be intact ifit shows the following characteristics:
An appreciable closing force has to be overcomewhen lever 48.6 is moved to the “Off” position byhand (Fig. 5/6). When the lever is released, it mustautomatically return to the “On” position and thecontacts must be heard to close.
After checking the vacuum, refit the lever 48.6 to theswitching bar 48.
48.6
48.
48.6
Fig. 5/3 Check mark
Checking the vacuum
Such a check should be made should there be anydoubt of an interrupter having developed a leak. It isnecessary in such cases to disconnect the VCB fromthe busbar and cable side. The check is performedwith an HV test unit. Additionally, as a quick method,check the vacuum as follows:
Open and isolate the breaker and detach theswitching bar coupler 48. from lever 48.6 (Fig 5/4)
30.
13.9
36.1
20
List of spares for 3AH3 VCBs
SR. DESCRIPTION MLFB MATERIAL CODE -SAP NO
30 Vacuum InterrupterVacuum Interrupter VS 17005, E1 3AY1715-1B 4109764026Vacuum Interrupter VS 15102, E31 3AY1715-1D 4109764032Vacuum Interrupter VS 30029, D21 3AY1715-1L 4109764033Vacuum Interrupter VS 25007, G2 3AY1715-1G 4109764035
53.1/ Closing / Tripping Release (Y1/Y9/Y3)54.1 Closing/Tripping Release 24V DC 3AY1510-3BY 4398095020
Closing/Tripping Release 30V DC 3AY1510-3MY 4398095021Closing/Tripping Release 48V DC 3AY1510-3CY 4398095022Closing/Tripping Release 60V DC 3AY1510-3DY 4398095023Closing/Tripping Release 110VDC 3AY1510-3EY 4398095024Closing/Tripping Release 125VDC 3AY1510-3NY 4398095025Closing/Tripping Release 220VDC 3AY1510-3FY 4398095026
53.2 Rectifier for closing / tripping release 3AX1525-1F 410976401554.2 Second Shunt Release (Y2)
Second Shunt Release H86F-24V – 32V DC 3AX1101-2B 4110660052Second Shunt Release H86F-48V – 60 V DC 3AX1101-2C 4110660063Second Shunt Release H86F110V – 127V DC 3AX1101-2E 4110660054Second Shunt Release H86F-220V DC 3AX1101-2F 4110660055Second Shunt Release H86F-110V AC, 50Hz 3AX1101-2G 4110660058Second Shunt Release H86F-230V AC, 50Hz 3AX1101-2J 4110660059
54.3 C T Operated Release H86W-0.5A (Y4) 3AX1102-2A 411066006250.4 Motor 110 V DC (M1) 3AY1511-1E 410976401650.4 Motor 220 V DC (M1) 3AY1511-1F 410976401750.4.2 Rectifier for Motor (V1) 3AX1525-1F 410976401550.4.1 Snap Switch (S21, S22, S3, S4) 3SE4206 4109764020
69 Aux. Contactor for electrical antipumping (K1)Aux. Contactor 2 NO+2 NC 24V DC 3TH30 22 0BB4 3TH30 22 0BB4Aux. Contactor 2 NO+2 NC 30V DC 3TH30 22 0BC4 3TH30 22 0BC4Aux. Contactor 2 NO+2 NC 48V DC 3TH30 22 0BW4 3TH30 22 0BW4Aux. Contactor 2 NO+2 NC 60V DC 3TH30 22 0BE4 3TH30 22 0BE4Aux. Contactor 2 NO+2 NC 110V DC 3TH30 22 0BF4 3TH30 22 0BF4Aux. Contactor 2 NO+2 NC 220V DC 3TH30 22 0BM4 3TH30 22 0BM4Aux. Contactor 2 NO+2 NC 110V AC 3TH30 22 0BG1 3TH30 22 0BG1Aux. Contactor 2 NO+2 NC 220V AC 3TH30 22 0BN1 3TH30 22 0BN1
68.7.1 64 Pin Socket (X0) 3AY0142-0Y 410976402368.7.1 32 Pin Socket (X0) — 4112833001
68 Auxilliary Switch 6 NO + 6 NC (S1) 3SV9273Y 439213307368.0.1 Auxilliary Switch 12 NO + 12 NC (S1) 3SV9274Y 4392133074
50 Hand crank for spring charging 3AX1530-2B 4112871001/00321 Manual Handle 3AX1130-2A 411049000117 Installation parts for Second Shunt / CT operated release
for one release (Y3) 3AX17 11-3E 4398163001for one release (Y2, Y4, Y7) 3AX17 11-3A 4107753006for two releases (Y2, Y4, Y7) 3AX17 11-3B 4107753008
18 Kit of lock washers 3AY1550-0A 410976402419 Lubricants and grease 3AX1133-3A 4110522005
Accessories and recommended spare parts
A hand crank 3AX 1530-2B for charging the closingspring can be supplied as an accessory.
Owing to the fact that all parts of this breaker typehave been optimized to last the normal service life, itis not possible to recommend particular spare partsfor keeping in stock. Nonetheless, a list of standardspare parts is shown on page no. 23.
When ordering spare parts state the following:
1 Type designation, design code and serial numberof the 3AH3 vacuum circuit-breaker (see ratingplate).
2 The designation and part number, makingreference to illustrations in these operatinginstructions or to a photograph or sketch asapplicable. Alternatively, a sample may besubmitted.
21
Central legend
14/15. Rail or Mounting Plate
16.1 Upper post insulator
16.2 Lower post insulator
20. Top flange
27. Upper terminal
28. FRP bar
28.1 Central part
29. Lower terminal
29.1 Current link
29.2 Terminal
30. Vacuum interrupter
31. Fixed contact
31.1 Fixed contact stem
32. Ceramic housing
34. Metallic bellows
35. Moving contact guide
36. Moving contact
36.1 Moving contact stem
40. Bottom flange
48. Switching bar
48.6 Angled lever
49. Contact pressure spring (Compression spring)
50. Hand crank
50.1 Opening for hand crank
50.2 Gearbox
50.4 Motor M1
50.4.1 Snap switch
50.5 Hand crank coupling
50.6 Adapter for handcrank
51. Rating plate
51.1 Opening for rating plate
53. “CLOSE” press knob
53.1 Closing solenoid Y9
54. “OPEN” press knob
54.1 1st Shunt release Y1
54.2 2nd Shunt release Y2
54.3 Current transformer-operated release Y4
54.4 Undervoltage release Y7
55. “Closing spring charged” indicator
55.1 Opening for indicator “Closing springcharged”
58. Operating cycle counter
58.1 Opening for operating cycle counter
59. ON-OFF indicator
59.1 Opening for “Close/Open” indicator
60. Mechanism housing (frame)
60.1 Detachable cover
60.2 Cutout for hook
60.3 Crane hook symbol
61. Shock absorber
62. Closing spring / Switch-on spring
63. Breaker shaft / Switching shaft
64. Opening spring / Switch-off spring
66. Damping plates
68. Auxiliary switch S1 (6NO + 6NC)
68.0.1 Extended auxiliary switch S1(12NO + 12NC)
68.1 Tie rod (for auxiliary switch S1)
68.7.1 Low voltage socket connector X0 (64-pole)
69. Aux. Contactor
70. Earthing bolt M12
22
Troubleshooting of 3AH3 VCBs
Problem Symptoms / Effect Possible Causes / Reasons Remedial Measures
Breaker 1. Closing spring charges, 1. Electrical power to 1. Check electrical power to auxiliaryfails to but breaker does not auxiliary circuit is off, or circuit and/or replace blown fuses.close. close. control fuses have blown.
2. Loose connection, 2. Check & repair as necessary.damage to wiring.
3. No closing command to 3. Check for continuity & correctterminal 19 or A2 of socket logic circuit.
4. Plug & Socket are not 4. Check & repair.engaging.
5. Unoperational closing 5. Test closing release separatelyrelease. & then replace, if not operating.
6. Aux. switch (S1) contacts 6. Check & adjust mechanical21-22 are open when the linkage with aux. switch.breaker is closed.
7. Unoperational anti-pumping 7. Check & replace, if necessary.contactor (K1) & its contacts
2. Closing spring does not 1. Electrical power to 1. Check electrical power to auxiliarycharge automatically. auxiliary circuit is off, or circuit and/or replace blown fuses.
control fuses have blown.2. Loose connection, 2. Check & repair as necessary.
damage to wiring.3. Plug & Socket are not 3. Check & repair.
engaging.4. Unoperational charging motor. 4. Check & replace.5. Limit switches S21 & S22 5. Check & contact authorised service
fail to operate limit switch & correct.6. Mechanical failure of 6. Check & contact authorised
operating mechanism. service centres.3. Closing release operates, Mechanical failure of operating Check & contact authorised service
sound of breaker closing mechanism. centres.is heard, but breakercontacts do not close.
Nuisance 1. Electrical problem 1. Closing command continues 1. Check & correct logic circuits.or false on terminal 19 or A2.closing of 2. Terminal A2 of closing 2. Check to find out if problem inbreaker release is shorted to earth. wiring or release. Correct as per
requirement.2. Mechanical problem Mechanical failure of operating Check & contact authorised service
mechanism centres.Breaker 1. Tripping Release (Y1) 1. Electrical power to 1. Check electrical power to auxiliarydoes does not trip. auxiliary circuit if off, or circuit and/or replace blown fuses.not trip. control fuses have blown.
2. There is no tripping 2. Loose connection, 2. Check & repair as necessary.sound. damage to wiring.
3. No tripping command to 3. Check for continuity & correct logicterminal 4 or C2 of socket. circuit.
4. Plug & Socket are not engaging. 4. Check & repair.5. Unoperational tripping 5. Test tripping release separately
release. & replace, if not operating.6. Aux. switch (S1) contacts 6. Check & adjust mechanical linkage
23-24 are open when the with aux. switch.breaker is closed.
Nuisance 1. Electrical problem 1. Tripping command continues 1. Check & correct logic circuits.or false on terminal 4 or C2.tripping of 2. Mechanical problem 2. Mechanical failure of 2. Check & contact authorised servicebreaker operating mechanism. centres.
Siemens Ltd.PTD-03-118-019(This replaces PTD-03-118-018)
Siemens Ltd.Power Transmission & Distribution DivisionMedium Voltage SwitchgearThane Belapur Road,Thane 400 601.Tel. : +91 22 760 0135Fax : +91 22 760 0134 Order No. 4P-0502-03-98120-001AC
'Product development is a continuous process. Consequently, thedata indicated in this Booklet is subject to change without priornotice. For the latest information please contact our Sales Offices.'
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