sAir InsulatedMetal-Clad SwitchgearType 8BK88PLUS withVacuum Circuit-breakerType 3AH0On withdrawable truck upto 12 kV

Operation and MaintenanceInstructions

2Table of ContentsPage Nos

1 Technical Description ........................................... 31.1 General .................................................................. 31.2 Design Features ..................................................... 31.2.1 Switchgear Layout ................................................. 31.2.2 Circuit Breaker Compartment ................................. 41.2.3 Busbar Compartment ............................................. 41.2.4 Cable & CT Compartment ...................................... 51.2.5 Compartment for Low Voltage Equipment ............. 51.2.6 Accessories ............................................................ 51.2.7 Interlocks ............................................................... 61.2.8 Vacuum Circuit Breaker 3AH0 ................................ 61.2.8.1 Construction .......................................................... 61.2.9 Secondary Eqpts. ................................................... 61.2.10 Vacuum Interrupters .............................................. 61.2.11 Complement .......................................................... 71.2.12 Closing .................................................................. 71.2.13 Auxiliary Switch (S1) 3SV92 ................................... 71.2.14 Shunt Closing Release (Y9) 3AY1510 ..................... 81.2.15 Shunt Release (Y1) 3AY1510 ................................. 81.2.16 Shunt Release (Y2) 3AX1101 ................................. 81.2.17 Undervoltage Release (Y7) 3AX1103 ..................... 81.2.18 CT-Operated Release (Y4) 3AX1102 ....................... 81.2.19 Wiring .................................................................... 81.2.20 Dimensions and Weights ........................................ 81.3 Technical Data ....................................................... 91.4 Name Plates ........................................................... 91.5 Characteristic Values ............................................ 111.6 Influence of Environmental Parameters ............... 121.7 Service Life .......................................................... 13

2 Installation ......................................................... 142.1 Foundation .......................................................... 142.2 Electrical Service Room Dimensions ..................... 142.3 Transport Units .................................................... 142.4 Packing ................................................................ 142.5 Unloading, Movement at Site & Storage............... 142.5.1 Unloading ............................................................ 142.5.1.1 Handling Equipment Required ............................. 142.5.1.2 Procedure for Unloading ...................................... 162.5.1.2.1 Unloading Switchgear with a Mobile Crane .......... 162.5.1.2.2 Unloading the Switchgear

with a fork-lift Truck ............................................. 162.5.2 Moving Transport Unit ......................................... 162.5.3 Storage at Site ..................................................... 162.6 Examining the Switchgear against damages ........ 162.7 Transferring the Transport Units to

their points of installation .................................... 162.8 Installation of VCB ............................................... 172.9 Assembling the Switchboard ................................ 172.9.1 Removal of withdrawable truck ............................ 172.9.2 Bolting the Panels together .................................. 172.9.3 Fixing the Switchboard to the Foundation ........... 182.9.4 Bolting the Busbars together ................................ 192.9.5 Bolting the Main Earth bar

sections together ................................................. 192.10 Making the HV Cable Connections ....................... 192.11 Earthing the Switchboard .................................... 192.12 Other Work to be carried out ................................ 192.12.1 Checking the HV Connections .............................. 192.12.2 Checking the bolted Joints ................................... 192.12.3 Cleaning the Switchboard .................................... 192.12.4 Inserting the withdrawable truck ......................... 192.12.5 Protecting the panels against

Environmental effects .......................................... 202.13 Interpanel Wiring ................................................. 20

3 Putting the Switchgear into Service ................. 213.1 Commissioning .................................................... 213.2 Test Operations .................................................... 223.2.1 With Door Open ................................................... 22

3.2.2 With Door Closed ................................................. 223.3 Checking the Accessory Items .............................. 223.4 Revising the Circuit Diagram ................................ 223.5 Space Heaters ...................................................... 22

4 Operations ......................................................... 244.1 Brief Operating Instructions ................................. 244.2 Withdrawable Truck ............................................. 244.2.1 Positions of the withdrawable truck ..................... 244.2.2 Transferring the Withdrawable truck from

the connected position to the test /disconnected position manually ........................... 24

4.2.2.1 Normal Operations .............................................. 244.2.2.2 Castell Key Operations (Optional) ........................ 254.2.3 Transferring the Withdrawable truck

from the test / disconnected positionby hand Normal Operation ............................... 26

4.2.4 Removing the LV Plug .......................................... 264.2.5 Connecting the LV Plug ........................................ 264.3 Circuit Breaker Operating Mechanism .................. 264.4 Circuit Breaker Operation ..................................... 264.4.1 Charging the closing spring by hand .................... 264.4.1.1 For standard panels ............................................. 264.4.2 Switching State Indication ................................... 264.5 Earthing ............................................................... 264.5.1 Earthing of Busbars by Insulating Pole ................. 264.5.2 Earthing of Cables by Insulating Pole ................... 264.5.3 Removing Earthing Connections .......................... 264.5.4 Earthing of Busbars or Cables with a

Drawout Truck ..................................................... 264.5.5 Disconnection of Earthing Drawout Truck ............ 274.5.6 Earthing the Busbars or Cables with

Earthing Switch ................................................... 274.5.6.1 Earthing the Busbars with Earthing Switch .......... 274.5.6.2 Earthing Cables with Earthing Switch .................. 274.5.7 Disconnection of Earthing Switches ..................... 274.6 Breaker Compartment Door ................................. 274.6.1 To Open the Door ................................................ 274.6.2 To Close The Door ................................................ 274.7 LV Compartment Door ......................................... 274.7.1 To Open the Door ................................................ 274.7.2 To Close the Door ................................................. 27

5 Maintenance ...................................................... 285.1 Inspection Schedule ............................................. 285.2 Cleaning .............................................................. 285.3 Lubrication .......................................................... 285.4 Replacement of Parts ........................................... 285.5 Defeating the Door Interlock of

HV Compartment ................................................. 285.5.1 Drawout Unit in Connected Position .................... 285.5.2 Drawout Unit in Disconnected Position ................ 295.5.3 Restoring the Door Interlock ................................ 295.6 Maintenance VCB ................................................ 295.6.1 Safety Measures .................................................. 295.6.2 Inspection ............................................................ 295.6.3 Cleaning .............................................................. 295.6.4 Abnormal Operating Conditions ........................... 295.6.5 Checking the Contact Systems ............................. 305.6.6 Checking the Vacuum .......................................... 305.6.7 Service Life .......................................................... 305.6.8 Accessories and Spares Parts ................................ 305.6.9 Spares List of VCB ................................................ 315.6.10 Troubleshooting of 3AH0VCB ............................... 33

6 Disposal of the Product ...................................... 34

7 Summary of Important Instructions ................. 34

8 Additional Information ...................................... 358.1 Reference List of Items ......................................... 358.2 Tightening Torques .............................................. 35

Page Nos

3WarningTo ensure personnel & product safety

This equipment contains hazardous voltages andmechanical parts which move at high speed andmay be controlled remotely.

Non observance of the safety instructions canresult in severe personal injury or propertydamage.

Only qualified personnel should work on oraround this equipment after becoming thoroughlyfamiliar with all warnings, safety notices andmaintenance procedures contained herein.

The successful and safe operation of thisequipment is dependent on proper handling,installation, operation and maintenance.

Qualified Person

For the purpose of this instruction manual andproduct labels, a qualified person is one who isfamiliar with the installation, construction andoperation of the equipment and the hazardsinvolved.

In addition, he has the following qualifications:

(a) Is trained and authorized to energize, de-energize, clear, ground and lag circuits andequipment in accordance with establishedsafety practices.

(b) Is trained in the proper care and use ofprotective equipment in accordance withestablished safety practices.

(c) Is trained in rendering first aid.

1. Technical Description

1.1 General

Type 8BK88PLUS metal-clad switchgear is of horizontalisolation and horizontal drawout type (site extensible)in both direction for system voltages upto 12kV. Theswitchgear is designed for single busbar system and isfully compartmentalised. The design incorporates a setof interlocks for safe operation of the switchgear.

Type 3AH0 vacuum circuit-breakers are of the triple-pole indoor type for rated voltages up to 12kV.

The vacuum circuit-breaker consists of mechanismhousing complete with stored-energy springmechanism and control elements and threeencapsulated vacuum interrupters poles.

Under normal operating conditions, the vacuumcircuit-breaker is maintenance free.

The 3AH0 vacuum circuit-breakers comply with thestandards IS 13118, IEC 62271-100, IEC 60694 and8BK88PLUS conforms to IEC 60298, IS 12729, IS 3427,IEC 60694.

1.2 Design Features

1.2.1 Switchgear layout

Metal partitions subdivide each panel into

a circuit breaker compartment (1.1, Fig. 1)

a busbar compartment (1.2, Fig. 1)

a cable & CT compartment (1.3, Fig. 1)

a low voltage compartment (1.4, Fig. 1) Fig 1: Side view of switchgear cubicle(withdrawable truck in test position)

1.1 Circuit Breaker compartment1.2 Busbar compartment1.3 Cable & CT compartment1.4 Low Voltage compartment

The outside covers are bolted to the frame and thedoors are hinged.

1.1

1.2

1.3

1.4

41.2.2 Circuit breaker Compartment

The circuit breaker compartment contains a drawout /withdrawable truck with vacuum circuit breaker.

The withdrawable truck moves on two in-built (3.7,Fig. 3) foldable ramps. It can be transferred betweenthe Connected and Test positions behind closed doorsof circuit breaker compartment using a hand crank.

In the Connected (service) position, the upper contactarms of the withdrawable truck engage with themating contacts connected to the busbars and thelower contact arms of the withdrawable truck engagewith the mating contacts connected to the outgoingcircuit.

In the Test and Disconnected positions, the contactarms and their mating contacts are separated byindependently operated metallic shutters operated bythe truck movement. In the disconnected (Isolated)position, LV plug is removed.

Drive mechanism of the truck is connected to thecubicle frame using bolt arrangement. To remove thewithdrawable truck from the cubicle, the bolting ofdrive mechanism of truck should be removed.

1.2.3 Busbar Compartment (Fig. 4)

The busbar compartment contains:

The busbars

Bushing with Encapsulated Feeder Connections

The busbars are extending from one switchgearcubicle to the next. The ends of these sections arebolted to terminal pad of encapsulated feederconnections (4.4, Fig. 4).

2.1 Circuit breaker operating mechanism2.2 Contact Arms2.3 Encapsulated housing2.4 Interlocking plate2.5 Scraping earthing contact

Fig 2: Withdrawable truck with vacuum circuit breaker

3.1 CB Chamber Door3.2 Door close interlock3.3 Viewing window for

truck position3.4 Viewing window for

Spring chargeindicator andMechanical Counter

3.5 32 pin LV Socket2.1 CB operating mech.3.7 Ramp2.4 Interlocking Plate3.9 Holder for LV Plug (in

disconnectedposition)

Fig 3: Withdrawable Truck in Test Position & door open

3.10 Clip for locking LV Plug3.11 Opening for hand

crank for chargingclosing spring

3.12 Bolts for interlockingplate

3.13 ON push button3.14 OFF push button3.15 LV Socket Connector3.16 Plate covering manual

spring charge opening3.17 Viewing window for

ON/OFF indicator3.18 Opening for manual

operation

2.1

2.2

2.3

2.4

2.5

3.1

3.2

3.3

3.4

3.5

2.1

3.7

2.4

3.9

3.10

3.11

3.12

3.13

3.14

3.15

3.16

3.17

3.18

51.2.4 Cable and CT compartment (Fig. 5)

The Cable compartment contains:

Insulating bushings with the mating contacts forthe lower contact arms of the withdrawable part(5.2, Fig. 5).

Cable connecting terminals (5.4, Fig. 5).

A section of the main earth busbar (5.1, Fig. 5).

Current transformers (5.3, Fig. 5).

The terminals are accessible from the rear.

1.2.5 Compartment for Low Voltage Equipment(1.4, Fig. 1)

This compartment houses all the low voltage devices(protective relays, MCBs, control terminals, etc.,)Indicating lamps/meters, push buttons, relays andcontrol switches are mounted flush with LVcompartment door. In certain cases, additional LVcompartment is also provided on rear side.

1.2.6 Accessories

Following accessories are supplied with theswitchgear.

Hand crank for charging the closing spring of thevacuum circuit breaker (6.1, Fig. 6).

Hand crank for truck movement betweenConnected and Test positions (6.2, Fig. 6).

Double bit key for locking/unlocking the trucktransfer operating mechanism (6.3, Fig. 6) anddoor lock operations.

4.1 Encapsulated feeder connection - L14.2 Encapsulated feeder connection - L24.3 Encapsulated feeder connection - L34.4 Terminal pad for busbar bolting

Fig 4: Busbar Compartment

5.1 Main earth bar5.2 Insulating bushings for lower mating contacts5.3 Current transformers5.4 Cable connecting piece5.5 Metal cover for control wire ways5.6 Gland plate for power cables

Fig 5: Cable & CT Compartment

Fig 6: Accessories

6.1 Spring charging handle6.2 Hand crank for movement between service and test

positions6.3 Double bit key for locking/unlocking the transfer

operating mechanism6.4 Handle for operating earth switch6.5 Handle for manual operation of C.B.

4.1

4.2

4.3

4.4

5.1 5.2

5.3

5.4

5.5 5.6

6.1

6.2

6.3

6.4

6.5

61.2.7 Interlocks

The positions of the withdrawable part are describedon page .

State The following operationsare not possible

Withdrawable truck in Removal of theconnected/service withdrawable truckposition, switching Opening of thedevice ON circuit breaker

compartment door Pulling of the LV plug

switching device OFF Opening of the door Pulling of the LV Plug

Withdrawable truck Closing of thelocated between the switching deviceservice and test Opening of thepositions circuit breaker

compartment door Pulling of the LV plug

Withdrawable truck in Transfer of thetest position, switching withdrawable truckdevice ON Opening of the

circuit breakercompartment door

Withdrawable truck in Closing of the doordisconnected position Transfer of theLV plug pulled off, withdrawable truckswitching device OFF to service position.and door open 1.2.8 Vacuum Circuit Breaker 3AH0

1.2.8.1 Construction of 3AH0

The vacuum circuit-breaker consists of the mechanismhousing (2.1), the 3-pole assemblies with vacuuminterrupters (7.2), Encapsulated housing (2.3). Themechanism housing accommodates all electrical andmechanical elements required for opening and closingthe vacuum circuit-breaker. The mechanism housinghas a detachable cover which has cut-outs for theactuating and indicating devices. Depending on theequipment level of the circuit-breaker, some of thesecut-outs are not used and are in this case sealed withblanking plugs.

Fig. 9 depicts the mechanism housing of the 3AH0vacuum circuit-breaker, as a stored-energy mechanism.It also shows the layout of the full individualmechanism subassemblies in the mechanism housing.

1.2.9 Secondary equipment

Refer Fig. 9.

1.2.10 Vacuum interrupters

The basic construction of the vacuum interrupters forthe 3AH0 vacuum circuit-breaker is shown in thesectional view in Fig. 10.

Fig 7: 3AH0 vacuum circuit-breaker, side view

2.1 Mechanism housing7.2 Vacuum interrupter7.3 Switching Bar2.3 Encapsulated Housing

Fig 8: 3AH0 vacuum circuit - breaker, front view ofmechinism housing

3.11 Opening for hand crank3.13 "CLOSE" pushbutton3.14 "OPEN" pushbutton8.8 "CLOSE/OPEN" indicator8.9 Spring state indicator8.10 Mechanical Counter8.11 Cover8.12 Rating plate

2.1

7.2

7.3

2.3

3.11

3.13 3.14

8.8

8.9

8.10 8.11

8.12

7The fixed contact piece (10.1) is connected directly tothe housing. The moving contact piece (10.2) is fixedto the terminal bolt (10.3) and is located centrally inthe guide (10.4). The metal bellows (10.5) togetherwith insulators (10.6) made of high alumina ceramicsand the end flanges (10.7) form the vacuum-proofinterrupter housing.

The vacuum interrupters fitted in the 3AH0 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 torespective rated short-time AC voltage stipulated inaccordance with DIN VDE/IEC (rated power frequencywithstand voltage).

1.2.11 Complement

The basic version of the 3AH0 vacuum circuit-breakercomprises:

Manually operated snap-action mechanism for closing

Stored energy "open" with shunt release (Y1)

Auxiliary switch 6NO/6NC (S1)

Each 3AH0 vacuum circuit-breaker can be equippedwith the following supplementary devices:

Manually operated stored-energy mechanism forclosing

Electrical operating mechanism (M1)

with antipumping feature and shunt closingrelease (Y9)

Position switch for signalling"Closing spring charged" (S4)

Operating cycle counter

Shunt release 3AX 11011) (Y2)

Current transformer-operatedrelease 3AX11021) (Y4)

Undervoltage release 3AX 11031) (Y7)

Mechanical interlock

Wiring of the electrical equipment to 24-pin terminalstrip or 32 pole connector.

1) The 3AH0 vacuum circuit-breaker can be fitted with a maximumof 1 releases of type 3AX 11. in addition to or instead of thestandard shunt release Y1.

1.2.12 Closing (Refer 3.1.1)

1.2.13 Auxiliary switch (S1) 3SV92

Two versions of the auxiliary switch can be supplied.The standard version is fitted with 6 NO contacts and 6NC contacts. The extended version is fitted with 12 NOcontacts and 12 NC contacts.

Rated insulation voltage : AC/DC 250 V

Insulation class : C

Current : 10 A

Making capacity : 50 A

Voltage Breaking Capacity

U (V) Resistive load Inductive load

up to 230 AC 10 10

24 DC 10 10

48 DC 10 9

60 DC 9 7

110 DC 5 4

220 DC 2.5 2

Fig. 11: Breaking capacity of 3SV92 auxiliary switch

9.1 Gearbox9.2 Position switch9.3 Closing spring9.4 Motor8.9 "Closing spring

charged" signal8.10Operating cycle counter9.7 Closing release

Fig. 10: Vacuum interrupter

10.1

10.2

10.5

10.7

10.4

10.3

10.6

Fig 9: Mechanism housing without cover

9.8 Auxiliary switch3.13Pushbutton "CLOSED"3.14Pushbutton "OPEN"9.112nd shunt release9.121st shunt release9.13Mechanical interlocking3.9 Low-voltage plug

connector

9.1

9.2

9.3

9.4

8.9

8.10

9.7

9.8

3.13

3.9

3.14

9.11

9.12

9.13

81.2.14 Shunt Closing release (Y9) 3AY1510(additional feature)

The closing solenoid unlatches the charged closingspring and thus closes the circuit-breaker electrically.It is available for both AC and DC operation. Theclosing solenoid is not designed for continuousoperation and it is not automatically de-energizedinternally. Make sure that the closing command fromthe installation is limited to max. 1 min. The supplyvoltage of the closing solenoid may deviate from therated value by -15% to +10%. In operation with ACvoltage, a rectifier module 3AX1525 is installed in thecircuit-breaker.

Power consumption approx. 200 W/VA

1.2.15 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 theOpen latching mechanism by means of a direct-action solenoid armature and the circuit-breaker isthus opened. This opening solenoid is not designed forcontinuous operation and it is not automatically de-energized internally. Make sure that the openingcommand from the installation is limited to max. 1min. The supply voltage of the shunt release maydeviate from the rated value byn -30% to +10% withDC voltage, by -15% to +10% with AC voltage. Inoperation with AC voltage, a rectifier module 3AX1525is installed in the circuit-breaker.

Power consumption approx. 200 W / VA

1.2.16 Shunt release (Y2) 3AX1101(additional feature)

The 3AX1101 shunt release is fitted if more than oneshunt release is required. With its design, the electricalopening command is transferred in boosted form tothe Open latching mechanism via a solenoidarmature through unlatching of a energy store andthus the circuit-breaker is opened. This openingsolenoid is not designed for continuous operation andit is not automatically de-energized internally. Makesure that the opening command from the installationis limited to max. 1 min.

Power consumption approx. 60 W / VA

1.2.17 Under voltage release (Y7) 3AX1103(additional feature)

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 below acertain value the unlatching mechanism is releasedand opening of the circuit-breaker is thus initiated viathe stored-energy mechanism.

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 (see circuit diagram), but make sure thatshort-circuiting of the solenoid does not last for longerthan 1 minute.

Undervoltage release can also be connected to voltagetransformers. When the operating voltage drops toimpermissibly low levels, the circuit-breaker is trippedautomatically.

Power consumption approx. 27 VA or 18 W

1.2.18 Current Transformer Operated release(Y4) 3AX1102(additional feature)

Current Transformer operated release consist of astored-energy mechanism, an unlatching mechanismand an electromagnet system. When the trippingcurrent is exceeded (90% of the CT-operated releaserated current) the unlatching device of the stored-energy mechanism is released and thus opening of thecircuit-breaker is initiated. In addition to the primarycurrent transformers, matching transformers arerequired for application of the CT-operated releases.

Power consumption for releases with 0.5 A and 1 Arated tripping current = approx. 20 VA at 90% of therelease rated current and with open armature.

1.2.19 Wiring

In the basic version, the control leads are connectedelectrically directly to the built-in equipment. For thispurpose, the switching circuits are prewired inaccordance with the equipmentplan shown in Fig. 12.

When carrying out subsequent wiring work, werecommend that you use the circuitry examples of thecircuit diagram illustrated in Fig. 12.

1.2.20 Dimensions and weights

The dimensions of the vacuum circuit-breaker areshown in the relevant drawings, which can be orderedthrough your Siemens office.

The weight can be found on the breaker rating plate,(Fig. 14) or in the relevant drawing.

91.3 Technical Data

8BK88PLUS

Rated Voltage Ur

12 kV

Rated Power Frequency withstand 28 kVVoltage U

w

Rated Impulse Withstand Voltage Up

75 kVp

Rated short time withstand 26.3 kAcurrent (rms) 3 secs

Rated peak withstand current 66 kA

Rated short circuit breaking capacity 26.3 kA

Rated current of busbar (maximum) 2000 A

Rated current of feeders (maximum) 1250 A

Rated frequency 50 Hz

3AH0

Rated voltage Ur

12 kV

Rated power frequency withstandvoltage U

w28 kV

Rated lightning impulse withstandvoltage U

p75 kVp

Rated short time withstand 26.3 kAcurrent (rms) 3 secs

Rated peak withstand current 66 kA

Rated short-circuit makingcurrent I

ma66 kA

Rated short-circuit breakingcurrent I

sc26.3 kA

Rated normal current Ir

800 A

1250 A

Pole centre distance 160 mm

Weight in * 70 kg

Type 800A 3AH0 104-1

1250A 3AH0 104-2

* Basic version; the weight can be up to 10 kg higher dependingon the equipment level

1.4 Nameplates

A nameplate containing the relevant data is fixedinside each panel. The withdrawable vacuum breakerhas its own nameplate and the rated normal currentstated on it may be different than that of theswitchgear.

3AH0 vacuum circuit-breakers are identified by amachine-readable product designation made up of aseries of figures and letters, whose first 8 places canbe found on the name plate of the circuit-breakers. In

connection with the design code stated on the nameplate, the machine-readable product designationprovides a full description of the circuit-breaker. Thefigure below shows what the individual places of thebasic machine-readable product designation stand for:

The basic machine readable product designation of thecircuit breaker is stated on the name plate which canbe read in the operating position, contains thefollowing information:

Basic type

Rated voltage code,design code

Rated short circuitbreaking current code

Rated normal currentcode

3 A H 0 1 0 4 - 2 ... Secondary equipmentin accordance withdelivery documents

Fig. 14: Name plate of a breaker

Note : In the event of any queries, state the typedesignation, design code and the serial number.

Degree of protection

Basic model IP 4X acc. to IEC 60 298 / IS3427 orIP 40 acc. to IEC 60 529 / IS 12063

Overall dimensions: (Refer Fig. 16).

Weight of switchgear cubicle: approx. 500 kgs. withvacuum circuit breaker.

1 Covers fitted to the left-hand and right-hand endpanels of a switchboard.

2 Pressure relief channel for the Cable and CTcompartment, 150mm deep.

! s !Type Design Code

Sr. No. N8 Year of manuf.

Ur kV, f 50 Hz Ir A

Isc kA tk s

Up kV m kg

Rated operating duty O-0.3s-CO-3min.-CO

! MADE IN INDIA !70 0107746001

10

Function schematic diagram (Typical)

Fig. 12 3AH0 VCB with manual / motor operatedmechanism, closing / tripping releases and with32-pin socket.

Fig. 13 Remaining contacts of aux. switch (6NO + 6NC)

HA Manual tripping

HE Manual closing

K1 Anti-pumping contactor

M1 Motor operating mechanism

P Energy store

S1 Auxiliary switch

S21, S22 Position switches (cut-out motor after charging ofclosing spring)

S3 Position switch (opens when closing spring charged)

S4 Position switch (signals charged state of closing spring)

X0 Socket of low-voltage plug connector

Y1 1st Shunt release

Y2 2nd Shunt release

Y4 CT operated release

Y7 Undervoltage release

Y9 Closing release

S16 Aux. switch (operates in test & service positions) ismounted on VCB truck

V2 - V3 Rectifiers for tripping / closing releases (with a.c. supply)

11

Fig 15: Name plate of a cubicle

Fig 16: Overall cubicle dimensions

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 processand the instant when the arcing contacts separate inall poles in the subsequent opening process.

Dead time = The interval of time between final arcextinction in all poles in the opening operation and thefirst re-establishment of current in any pole in thesubsequent closing operation.

Closing time = the interval of time between theinitiation of the closing operation and the instantwhen the last breaker pole closes.

The operating and pulse duration times stated in Table2 below apply for 3AH0 vacuum circuit breakers:

Operating times:

Opening time, 1st shunt release (Y1) < 65 ms

Opening time, 2nd shunt release (Y2) < 50 ms

Arcing time

12

Fig. 16.1: Relationship between the correction factor a and the site altitude

Co

rrec

tio

n f

acto

r a

Altitude of site above sea level

Fig. 16.2: Maximum permissible load current as a function of the circuit breaker ambient temperature

Load

cu

rren

t

Ambient temperature

1 Lower temperature limit: -5C2 Without ice formation and wind-driven precipitation3 Prerequisite: clean insulating parts

1.7 Influence of environmental parameters

1.7.1 Permissible ambient conditions

The 3AH0 vacuum circuit breakers are designed for thenormal operating conditions laid down in thestandards.

Permissible ambient temperatures:Maximum value + 40oCMaximum value, 24 hour mean + 35oCMinimum value - 5oC

Permissible relative humidity:

Maximum value, 24 hour mean 95 %Maximum value, 1 month mean 90 %

Under these conditions condensation may occasionallyoccur. Furthermore, the breaker is also suitable for usein the following climatic categories per IEC 60721,Part 3-3:

Climatic environmental conditions: Category 3K41

Biological environmental conditions: Category 3B1

Mechanical environmental conditions: Category 3M2

Chemically active materials: Category 3C22

Mechanically active materials: Category 3S23

Use of the breaker under conditions other than normalis possible when certain measures are implemented.Please ask your local Siemens office about thenecessary measures.

1.7.2 Site altitude

The rated insulating capacity values (rated lightningimpulse withstand voltage, rated power frequencywithstand voltage) specified for the equipment are, inaccordance with the provisions of IEC Publication 71,based on standard atmospheric conditions (1013 h Pa,20oC and 11 g/m3 water content) and sea level. Theinsulating capacity of an insulation in air decreaseswith increasing altitude as a result of changes in the airdensity. Standards promulgated by IEC and othersdisregard this decrease in insulating capacity foraltitudes of up to 1,000 m, i.e. the decrease ininsulating capacity of 9% at an altitude of 1,000 m isstill permissible.

13

The standards provide no guideline for altitudes ofmore than 1,000 m with respect to insulation ratings.Our own recommendation is as follows:Since this method used for rating insulation up toaltitudes of 1,000 m has proved to be satisfactory, itshould also be applied to higher altitudes. The altitudecorrection factor a in Fig. 16.1 should therefore bebased on the insulation capacity at 1,000 m, which islower by 9% than the capacity at sea level.

The following expression thus applies for the selectionof the air-insulated equipment:

Rated impulse withstand voltage to be selected

required rated impulse withstand voltage>

1.1*a

Example:

Switchgear for Rated Voltage of 7.2kV

Site altitude above sea level 3,000 mRequired rated impulse withstand voltage 60 kVCorrection factor (according to Fig. 16.1)0.73Rated impulse withstand voltage to be selected:

60 kV = 74.71 kV1.1*0.73

This means that equipment designed for a ratedvoltage of 12 kV, is required for this application.

1.7.3 Load current

The maximum permissible load current as a function ofthe ambient temperature of the 3AH0 circuit breakerhas been plotted in Fig. 16.2. The load currentsindicated apply to open-type switchgear. Metal-enclosed switchgear must be derated as specified bythe switchgear manufacturer.

1.8 Service life

Under normal operating conditions, the circuitbreakers are designed for 10,000 operating cycles.Due to the optimization of the service life of all parts,the level of reliability falls if the breakers are used for agreater number of operating cycles. The manufacturercan therefore not recommend continued use of thecirucit breakers, even if certain subassemblies arerenewed.

When the permissible maximum has been attained,the complete pole assemblies must be renewed.Detailed instructions are supplied with thereplacement pole assemblies.

When ordering replacement pole assemblies, state thecircuit breaker type, design code and serial number(see name plate).

14

2. Installation

The installation sequence should be planned andprepared with care. Ensure that the erectors and theoperating personnel read the operation andmaintenance instructions.

2.1 Foundation

A false floor or a reinforced concrete floor should beused as the foundation.

False Floor

Place a girder frame flush with finished floor, commonto several or all of the switchgear panels so that it isparallel to the operating front. The girder is meant tosupport the panel bottom rails below the 30mm x30mm cutouts. All the edges of the panels should beresting on this frame.

Concrete Floor

This should be provided with foundation rails on whichthe panels are to rest. For floor cutouts refer to Fig. 17.The foundation should be prepared before the panelsarrive. Level differences between the mountingsurfaces of the individual panels should be determinedand compensated for by using a sheet as shown inFig. 18. The level difference beyond permissibletolerance have to be suitably compensated.

2.2 Electrical Service Room Dimensions

Height of service room* with LV at least 2400 mmchamber of 850 mm height

Width of control aisle in front of at least 900 mmthe panel for single row

Clearance between the wall and at least 800 mmcubicle rear

* In case of LV chamber with extra height; it should beascertained that a min. clearance of 300 mm is available abovethe LV chamber.

A power source must be available. Work which is likelyto produce dust or dirt is not to be carried out whilethe cubicles are being installed. The floor should beplane to enable transport units to be moved about onroller or similar devices.

2.3 Transport Units

A transport unit consists of a maximum of 4 ready-assembled switchgear cubicles, complete withwithdrawable truck. The cubicle should not be liftedfrom the top with circuit breaker inside.

2.4 Packing

The transport units are packed in one of the followingmethods

(a) For shipment to inland destinations each transportunit is fixed on a sturdy wooden pallet and coveredby plastic sheet for surface protection and packedin normal wooden case.

(b) for shipment overseas each transport unit may beadditionally packed in a seaworthy case. It isenclosed in plastic sheet, which is sealed air-tightand includes bags containing dessicant.

Accessory items are packed separately, or kept in oneof the cubicle transport units (see the despatchadvice).

2.5 Unloading, movement at site & storage

2.5.1 Unloading

2.5.1.1 Handling equipment required

A mobile crane or a chain pulley block of 3 tonnecapacity for unloading the transport units.

Fig 17: Foundation planNote: All dimensions are in mm

VAR No Rear Box Depth (D)0-01 -----------0-02 200mm0-03 400mm0-04 600mm0-05 800mm0-06 1000mm

15

Tolerance as per DIN 43661:

Straightness 1mm. Per 1mtr. Length, 2mm. For total length

Level 1mm within 1mtr.measured length.

Higher tolerances are to be compensated by laying sheets (below panel)

Fig 18 : Dimension data sheet for the foundation.

In case foundation rails or fabricated channel frames are embedded in cement concrete, care should be taken to leave open pockets belowthe location of fixing holes of the panel for tightening the foundation bolts.

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16

Lifting tackle.

A fork-lift truck with a fork length of about 1.5 m,for handling the switchgear inside the building.

Hydraulic jacks or winches and roller pads.

The handling/transport gear must meet the siterequirements with regard to its construction and loadbearing capacity.

2.5.1.2 Procedure for unloading

Do not unpack before unloading the transport units.Take care not to damage the plastic sheet because itprotects the switchgear against environmental effects.

Use mobile crane or a fork-lift truck for unloading.

2.5.1.2.1 Unloading switchgear with a mobile crane

Suspend the lifting tackle from the crane andposition it over the transport unit.

Attach the ropes to the tackle and position them sothat they cannot exert pressure on the switchgearpanel sides.

Attach the ropes to the wooden pallet.

Carefully raise the transport unit and check to seethat it is correctly balanced, if necessary lower thetransport unit and correct any imbalance byrepositioning the ropes on the lifting tackle.

Lower the transport unit on the ground.

2.5.1.2.2 Unloading the switchgear with a fork-lifttruck

Transport units of not more than four panels can beunloaded with a fork-lift truck if the access routespermit this. Make sure the transport units are correctlybalanced.

2.5.2 Moving the transport unit

Move the transport units as close as possible to theswitch house and put them down.

Move each transport unit into the building.

Dismantle and remove the crates just beforeinstallation.

Take off the plastic sheet just prior to bolting thetransport units together and also temporarily tocheck them for any signs of transport damage.

2.5.3 Storage at site

Reference to 2.4 for various types of packings:

Store the units in upright position only.

The units must be stored in adequetly coveredlocation such that they are protected from Sun,Rain, Flood Waters & other such Natural elements.

2.6 Examining the switchgear against damage

As soon as the switchgear has been unloaded, carryout visual inspection and examine it to see that it iscomplete. Record any damage and its cause withoutdelay, in the presence of the forwarding/insuranceagent, if the damage was caused en route.

This report is essential for any damage claims.

2.7 Transferring the transport units to theirpoints of installation

Transfer the transport units including their woodenpallets to their point of installation using fork-lift ormobile crane or trolleys.

Withdraw the truck from the cubicle (refer clause2.9.1).

Put the cubicles down on the cleaned site or atleast immediately in front of it in the correct order,leaving a clearance of about 25 mm between them.

To remove the transport units from their woodenpallets

Open the CB door / rear bottom cover.

Fig 19: Withdrawable part in service position

17

Unscrew the bolts securing the panels to thewooden pallet. The bolts are located in the30mmx30mm cutouts in the floor rails (seeFig. 17).

Close the CB chamber door (refer clause 4.5).

Place four winches under the floor rails of theouter panels and uniformly raise the transportunit.

Remove the wooden pallet away.

Lower the transport unit as far as it will go andplace it on two wooden beams if it is locatedabove its site or place on four roller pads if it isin front of its sites.

In the latter case roll the units to their mountingposition. If this means changing the direction oftravel, raise the units and reposition the rollerpads accordingly. Now place planks andchannels in foundation cutouts that have to becrossed.

Raise the transport units on their mounting siteand remove the roller pads.

Lower the transport units as far as possible andplace them on two wooden beams.

Now raise the units; first on one side and thenon the other, using roller-type crowbars; pull outthe planks & lower the units onto the cleanedfoundation. Position the crowbars only at thecorners of the transport units below the verticalframe members.

2.8 Installation of VCB

The breaker can be lifted by means of the twotransport holes marked by a crane symbol-usingsuitable hoisting gear. Ref. Fig. 20.

The 3AH0 vacuum circuit breakers are supplied in theopen (OFF) state with closing spring discharged.

2.9 Assembling the switchboard

Carry out the work described under clauses 2.9.1 toclause 2.9.5 in that sequence. While bolting thepanels/busbars, keep the bolts loose (not fullytightened) till all the bolts for sections (refer clause2.9.2 to 2.9.5) are in position. Then tighten the joiningbolts (refer clause 2.9.2) followed by busbar bolts,(refer clause 2.9.4.2) followed by foundation bolts(refer clause 2.9.3).

2.9.1 Removal of withdrawable truck

Bring the withdrawable truck to disconnectedposition (refer clause 4.2.2).

Place platform of same height as of wooden palletin front of the panel but joining the pallet.

Open the door of the circuit breaker compartment(refer clause 4.6.1). The withdrawable truck muststill be in the disconnected position.

Mark the withdrawable truck and their panels.

Disconnect LV plug (3.5, Fig. 3) and place it in itsholder (3.9, Fig. 3) on the door.

Unscrew the bolts (3.12, Fig. 3) on the interlockingplate.

Slowly move the truck away from the panel. Thetwo ramps drop automatically enabling free easywithdrawal of truck.

Put back the ramp to normal position and close theCB chamber door (refer clause 4.6.2).

Remove the other drawout trucks in the samemanner.

Never handle a withdrawable truck by its contactarms.

2.9.2 Bolting the panels together

It is assumed that the first transport unit is in its finalposition and that the other units are positioned on thefoundation rails in the correct order but with aclearance of approximately 50 cms between them.

It is always preferable to install the central transportunit first. This practice should be invariably adopted fora board with 20 or more panels. After installing thecentral transport unit, the other units can be installedon its left and right in proper sequence.

Procedure

Centrally align the central transport unit on its

Fig 20: Fixing point for hoisting gear

18

3.1 Compartment door21.2 Upper metallic shutter21.3 Lower metallic shutter

Fig 21: View into Circuit Breaker compartment afterremoving the drawout truck

foundation. The switchgear cubicle must be at thecorrect level (refer Fig. 18) and be absolutelyvertical. If necessary place shims.

under the frame upright and

under the bottom rails near the 30 mm x 30 mmcutouts for the foundation bolts.

Remove the bolts fitted at the left hand end wallsof each transport unit as viewed from the front.

Move up the second transport unit.

Align this on the second transport unit. Align thison the foundation, raise it to the correct level andmake sure the panels stand vertically.

Use shims if necessary in the same manner as for thefirst transport unit.

Using nut & bolt, join the adjoining cubicles.

Check whether the panels are truly vertical. Ifnecessary slacken the screws and seal the gapswith rubber.

3.1 21.2 21.3

Move up the other transport units in sequence, oneither side of the already aligned unit, align themand bolt them together.

2.9.3 Fixing the Switchboard to the Foundation

The panels bottom plate has four 30 mm x 30 mmcutouts (refer Fig 17) for fixing purposes. The fixingcan be done either by welding or by bolting.

4.3.1 Upper Insulating Bushing L34.3.2 Upper Fixed Contacts L35.2.3 Lower Insulating Bushing L35.2.4 Lower Fixed Contacts L3

Fig 22: View into circuit breaker compartment with shutterheld open intentionally

Fig 23: Procedure for bolting transport units together

4.3.1

4.3.2

5.2.3

5.2.4

19

2.12 Other work to be carried out

2.12.1 Checking the HV Connections

On all HV cables, check

the bolts for tightness

the sealing and earthing

the core spacing on three core cables and the anti-magnetic clips on single-core cables.

2.12.2 Checking the Bolted Joints

Check the power and auxiliary circuit connectionsof switching devices at random, but examine allterminal block connections, making sure that theblocks are correctly labelled and replace anymissing labels by referring to the circuit diagram.

2.12.3 Cleaning the Switchboard

Clean all post insulators, insulating bushings andbusbars in all compartments using a soft dry cloth.

Do not use any abrasive chemical or detergents toclean installed parts. Use only distilled water ifnecessary.

2.12.4 Inserting the drawout truck

open the front door.

put down the ramps.

place the drawout truck in front of thecorresponding panel.

Fig 24: Withdrawable part drawn outside the cubicle (Noteput down position of ramp)

Welding

Weld the bottom rails to the foundation at the cutouts.Insert shims (refer clause 2.9.2), where necessary, toavoid having to weld across air gaps. Coat the weldswith any anti-corrosion paint.

Bolting Down

Embed anchor-bolts in the foundation (through the 30mm x 30 mm cutout) or drill the appropriate holes inthe foundation rails (false floor).

Insert shims between the foundation and bottom railsnear the cutouts. Tighten the screws withoutdistorting the panels.

2.9.4 Bolting the main Busbars together

Hex. Head Bolts (M10) are used. Refer 8.2 for torquevalues. The busbars of adjacent units must be joinedtogether using the busbars and hardware supplied.

The upper rear cover has to be removed for approachto main busbars. The busbars of the switchgear panelsforming a transport unit are already bolted. Refix theupper rear cover after the busbars are bolted together.

2.9.5 Bolting the Main Earth Bars together

The main earth bars of the transport units must belinked together. One of the two parts to be boltedtogether is already fitted with a link. This must beundone, passed through the partition and bolted tothe two adjacent earth bar sections. The cover on theside wall should be properly adjusted after joining theearth bars.

2.10 Making HV Cable connections

The lower end cable terminals of each switchgearcubicle are fitted with the appropriate bolts for thecable lugs. The termination compartment takes cablesand sealing ends. Due attention to be given to theinstructions of cable end termination kit manufacturer.

Bottom sheets forming the floor in the terminationcompartment must be taken out prior to cabletermination to make cutouts to suit the cables, andmust be refitted in the cable compartment. Forapproach to cable terminations, remove the lower rearcover which should be refitted after the termination isdone.

All openings made for cable entry must becompletely sealed.

2.11 Earthing the Switchboard

Connect the earth terminals of at least one (two maybe required to suit local guidelines) switchgear cubicleto the station earth. Termination facility for earthconnection is provided on the earth busbar mountedin the cable chamber.

20

Transfer the drawout truck inside the panel andpush it as far as it will go.

Fix the racking mechanism/interlocking plate tostructure frame.

Fix the ramps back in position (refer 4.5.2).

Close the door (3.1, Fig. 21).

Insert all other drawout trucks in the same manner.

2.12.5 Protecting the panels againstenvironmental effects

(a) Damaged sections of the paint finish may only betouched up with original paint.

(b) Fit the parts supplied to protect against the ingressof reptiles. Check in case they are removed duringinstallation.

(c) Close all the doors & covers properly.

2.13 Interpanel Wiring

The wire have been left loose in the LV compartmentof certain panels.

These wires must be connected from panel to panel asper approved wiring diagrams.

21

3. Putting the switchgear into service

For details of operation refer section 4

3.1 Commissioning

DangerHigh voltage!

Touching live parts will result in death or severepersonal injury.

This equipment may be operated only by qualifiedpersonnel who have become thoroughly familiarwith the respective instruction manual and inparticular all safety instructions.

CautionThis 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 damage to property.

In particular:

Do not remove the cover of the mechanismhousing. Do not reach inside the openings in theoperating mechanism. Do not touch pole assembliesand operating rods.

Prior to commissioning, check the vacuum circuitbreaker in accordance with the following points.

1. Clean the circuit breaker as applicable.

2. Check that all fixing and terminal screws aretightened securely.

3. Examine the circuit breaker for any externaldamage, especially to the terminal pads, V.I.housing, cover and vacuum interrupters.

CautionThe vacuum circuit breaker may be operated onlywith the original hand crank in order to avoidinjuries that may occur if the motor starts upsuddenly.

4. To test switching manually, charge the closingspring using the hand crank (approx. 20 rotations)till the closing spring is charged (the symbolClosing spring charged appears in the indicatoropening. Press the CLOSE push button.

Once the circuit breaker has closed, open it again bypressing the OPEN pushbutton. Check themechanical and electrical state indication.

On the 3AH0 vacuum circuit breaker withundervoltage release (Y7) 3AX1103, the arrestingscrew of the hammer must be moved from position Ato B (see instruction card in the mechanism housing ofthe 3AH0 vacuum circuit breaker).

With circuit breakers equipped with a motor-operated,stored-energy mechanism, the motor starts upautomatically when the supply voltage is applied andcharged the closing spring. Close and open the circuitbreaker as described above.

CautionWhen the supply voltage is applied, the motorimmediately recharges the closing spring.

5. Check the auxiliary switch S1 and if applicable theposition switches electrically in both end positionsby actuating the 3AH0 vacuum circuit breaker.

6. Also check (by electrical actuation) whether theshunt closing and opening releases fitted operateproperly.

Once correct functioning of the 3AH0 vacuum circuitbreaker has been ascertained, it can be put intoservice.

3.1.1 Closing

Manually operated stored-energy mechanism

The closing spring is charged by means of the handcrank supplied until the "spring charged" indicationappears and an audible clicking noise indicates thatthe closing pawl has latched. It is then possible to closethe breaker either manually or electrically. Afterclosing, the spring can be recharged manually.

Motor operating mechanism (M1) with stored-energy mechanism (additional feature)

The stored-energy mechanism of the circuit-breakers isalso available with a motor-operated mechanism,including shunt closing release, instead of themanually operated mechanism. The motor-operatedmechanism starts operating immediately once thepower supply has been connected and the closingspring is discharged and is automatically de-energizedinternally after charging. Manual operation asdescribed under the chapter above can still beperformed at any time. A hand crank has to be orderedseparately.

The maximum DC power input is 500 W (approx.). Themaximum AC power input is 650 VA (approx.). Duringpart of the short spring charging time, the motorsoperate in the overload range. The recommendedratings for motor protection devices are shown inFig. 26 (the protection devices are not supplied with

22

the vacuum circuit-breakers and must be orderedseparately).

To protect the motors, we recommend and MCB with Gcharacteristics.

The supply voltage of the motor-operated mechanismmay deviate from the rated value by - 15% to + 10%.

DC/AC DC 220 V/Rated supply voltage DC 24 V DC 48 V DC 60 V 110 V AC 230 V

50/60 Hz 50/60 Hz

Recommended rating 10 A 8 A 6 A 4 A 2 Aof protection device

Fig. 26: Rated currents of motor protection devices

3.2 Test operations

3.2.1 With door open

The motor operating mechanism must startimmediately and charge the breaker closing spring.

Open and close the breaker five times.

Pull off the LV plug. Charge the breaker closingspring by hand (refer clause 4.2).

Operate the circuit breaker.

Refit the LV cable plug.

3.2.2 With door closed

Each switchgear panel should be tested as follows:

Transfer the withdrawable truck to thedisconnected position (see 4.2).

Switch in the auxiliary and control supply.

Transfer the withdrawable part to the connectedposition.

Open and close the breaker as long as no highvoltage is applied.

Without using force check all mechanical andelectromechanical interlocks for satisfactoryfunctioning. Check to see whether the switchingstates are indicated correctly in the control room.

Check whether the position of the withdrawableparts are indicated correctly (if the appropriateposition switches are fitted refer to the circuitdiagrams).

3.3 Checking the Accessory Items

The accessory items required must be easily availablein the switchgear room or an adjacent room. Theyinclude one hand crank each for transferring thewithdrawable truck and for charging the breakerclosing spring, a double-kit key for locking the hand-operating mechanism, the basic circuit diagram,operating instructions and warning signs. The handcrank for transferring the withdrawable truck is alsosuitable for all M8 bolts. Operating rod for manualclosing and opening.

3.4 Revising the Circuit diagrams

If circuits have to be modified during installation, theexisting circuit diagrams are marked up. When workhas been completed make sure that the originaldiagrams are revised.

3.5 Space Heaters

For cubicles installed in humid atmosphere, spaceheaters are fitted in the circuit breaker and cablecompartments. The thermostat controlled heatersshould be switched ON before taking the switchgearcubicle into service. The thermostat shall be set to cut-off the heater supply at about 5C higher than themaximum recorded site ambient temperature. Serviceconditions such as high humidity (above 70%) or lowload currents (less than 50% of nominal rating) or theabsence or non-switching of space heaters can, eitherindividually or in combination, cause condensation ofwater on the insulating parts, leading to electricalfaults.

CautionNote: The heaters must be always ON whether thebreaker is in service or not, to prevent condensationof moisture particularly on the insulatingcomponents.

23

s

BRIEF OPERATING INSTRUCTIONS FOR 8BK88PLUS SWITCHGEAR

Fig 25

FOR DETAILED DESCRIPTION OF ABOVE OPERATIONS & SPRING CHARGING OF CB,OPENING / CLOSING OF DOOR, ETC.

REFER OPERATION & MAINTENANCE MANUAL

3 3 18354 1

24

4. Operations

4.1 Brief operating instructions

Each row of cubicles is provided with brief operatinginstructions. Refer to figure 25.

DangerHigh voltage!

Touching of live parts will result in death or severepersonal injury.

This equipment shall be operated only by qualifiedpersonnel after becoming thoroughly familiar with therespective instruction manual and in particular allsafety instructions.

Warning

This equipment contains hazardous voltagesand mechanical parts which move at highspeed and may be controlled remotely.

Non-observance of the safety instructions can resultin severe personal injury or property damage.

In particular:Do not remove the cover of the mechanism housing.Do not reach inside any openings in the operatingmechanism. Do not touch pole assemblies andoperating rods.

4.2 Withdrawable truck

4.2.1 Positions of the withdrawable truck

Service position (connected position)

The circuit breaker is connected with the busbars andthe outgoing circuit Auxiliary circuit is connectedthrough LV plugs and socket.

Test position

The circuit breaker is disconnected from the busbarsand the outgoing circuit. Segregation as specified inIEC60298 is maintained. The LV circuits are connectedthrough LV plug and socket.

Disconnected position

The circuit breaker is disconnected from the busbarsand the outgoing circuit. The LV circuits aredisconnected by pulling out the LV socket from theplug.

When the LV plug and socket are connected thefollowing functions can be carried out:

The breaker compartment door can be opened.

The circuit breaker can be tested/operated, alsofrom the control room.

Functions such as ON/OFF indication andelectrical interlocks can be tested.

When the LV plug and socket are disconnected

The breaker compartment door cannot beclosed.

Instructions fro transferring of a withdrawable part bymanual racking:

1. Lock for the hand racking mechanism, to beoperated with a double-bit key.

2. Operating with hexagon shank for fitting the handcrank.

Corresponding positions

Position of double-bit key in lock Opening

Test/Disconnected position (locked) Closed

Manual racking Open

Connected position (locked) Closed

4.2.2 Transferring the withdrawable truck fromthe connected position to the test/disconnected position manually

4.1.2.1 Normal operations

In brief:

1st Step 2nd Step 3rd StepTurn double-bit key Insert and Turn double-bit key

turn handcrank

as far it willfrom by to go and pull from by to

it of

90 90

Fig. 27

In detail:

Ensure that the circuit breaker is open.

Insert the double bit key in lock (28.7, Fig. 28) andturn it anti-clockwise through 90 from connectedposition (locked) to Manual Racking. Thehexagon shank opening (28.8, Fig. 28) is nowaccessible.

The hand racking mechanism is unlatched.

Fit the hand crank (6.2, Fig. 6) to the hexagonalshank in opening (28.8, Fig. 28) turn it anti-clockwise as far as it will go and pull it off.

25

Turn the double-bit key anti-clockwise through 90from the position Manual Racking toDisconnected Position (locked) and pull it off.

Opening (28.8, Fig. 28) is now closed.The hand racking mechanism is locked.

4.1.2.2 Castell Key Operations (optional)

1st Step 2nd Step 3rd StepTurn castell key Turn castell key

as far it willfrom by to go and pull from by to

it of

90 90

Fig. 29

3.1 Door of switchgear compartment28.2 Window for inspecting the withdrawable part3.18 Opening for Manual ON3.18 Opening for Manual OFF3.4 Window for the indicators of the withdrawable part

- Number of operations (Counter)- Closing spring of circuit breaker: Charged label

with spring symbol, Discharged blank label3.16 Opening for hand crank for charging the breaker

closing spring28.7 Opening double-bit key for locking the transfer

operating mechanism28.8 Opening with hexagon shank for fitting the hand

crank for racking the withdrawable truck28.9 Door of compartment for LV equipment28.10 Opening for defeating interlock3.17 Window for indicator of breaker switching status

Circuit breaker Closed - ITripped - O

Fig 28

In detail:

Ensure that the circuit breaker is open.

Turn the castell key (which is trapped in themechanism) anti-clockwise through 90 fromConnected position (locked) to Manual Racking.

In this position the castell key can be removed forany interlocked operations which are to beperformed with circuit breaker in open condition.The hexagon shank opening (28.8, Fig. 28) is nowaccessible.

The hand racking mechanism is unlatched.

Fit the hand crank (6.2, Fig. 6) to the hexagonalshank in opening (28.8, Fig. 28) turn it anti-clockwise as far as it will go and pull it off.

Insert the castell key if it was removed forinterlocked operations. Turn the double-bit key anti-clockwise through 90 from the position ManualRacking to Disconnected Position (locked) andpull it off.

The castell key can also be removed in this positionto facilitate the opening of the HT compartmentdoor and / or other interlocked operations.

4.2.3 Transferring the withdrawable truck fromthe test/disconnected position by hand

In brief

1st Step 2nd Step 3rd StepTurn double-bit key Insert and Turn double-bit key

turn handcrank

as far it willfrom by to go and pull from by to

it of

90 90

Fig. 30

In detail:

Ensure that the circuit breaker is open, the LV plug(3.5, Fig. 3) and socket connector (3.15, Fig. 3) hasbeen put together and lock it up with the clip (3.10,Fig. 3). The breaker compartment door is closed.

The castell key can be removed in this position alsofor any interlocked operations which are to beperformed with circuit breaker in open position.

Fit the hand crank (6.2, Fig. 6) to the hexagonshank in opening (28.8, Fig. 28), turn it clockwiseas far as it will go and pull it off.

Insert the castell key if it was removed forinterlocked operations. Turn the key clockwisethrough 90 from position Manual Racking toConnected position (locked) and pull it off.

3.1

28.2

3.183.18

3.4

3.16

28.7

28.9

28.8 28.10

3.17

26

4.2.4 Removing the LV Plug

Transfer the withdrawable part to the test position(in accordance with clause 4.2.2) and lock it.

Open the breaker compartment door (refer clause4.6.1).

Unlock the plug (3.5, Fig. 3) and socket connector(3.15, Fig. 3) by turning down the clip (3.10,Fig. 3).

Pull off the plug and attach it to the holder (3.9,Fig. 3) which is fixed to the door.

4.2.5 Connecting the LV Plug

Put the plug (3.5, Fig. 3) and socket connector(3.15, Fig. 3) together and lock it with the clip(3.10, Fig. 3).

Close the breaker compartment door (refer clause4.6.2).

4.3 Circuit-breaker operating mechanism

The operating mechanism is of the stored energy type.For electrically operated breakers, motor automaticallycharges the closing spring after each switching ONoperation. Should the motor supply fail, the closingspring can also be charged by hand.

4.4 Circuit-breaker Operation

4.4.1 Charging the closing spring by hand:

Procedures

If the breaker compartment door

is closed (connectedposition) turn plate (3.16,Fig. 3) so that it clearsopening. Insert the handcrank and fit it to the opening(3.11, Fig. 3) of breaker.

is open (disconnectedposition), fit the handcrank directly to thebreaker operatingmechanism inopening (3.11, Fig. 3).

Operating Mechanism

Turn the crank until the symbol Spring Chargeappears in viewing window (Fig. 28) on the SpringCharge indicator. The operator is not at risk should themotor supply recover, because the hand crank free-wheels and detaches in the anti-clockwise direction.

Pull the crank off.

4.4.1.1 For standard panels

Insert handle (6.5, Fig. 6) in respective hole (3.18,Fig. 3) to ON / OFF the VCB.

If necessary charge the closing spring manually ifLV plug has been pulled off in disconnectedposition.

4.4.2 Switching State Indication

In the middle part of viewing window (3.17, Fig. 28)O means OFF, I means ON.

4.5 Earthing

4.5.1 Earthing of busbars by insulating pole

Switch off all breakers feeding to the busbars.

Open upper rear cover (of busbar chamber). Touchall phases with an earthing conductor mounted ona long insulating pole.

Short all the phases with a conductor and bolt it toearth.

Place necessary warning plates at all noticeablelocations.

4.5.2 Earthing of Cables by insulating pole

Switch off the breaker in the cubicle where cableearthing is desired.

Ensure that the cables are not getting the supplyfrom the other end.

Remove the lower rear cover of the cable chamber.

Follow the procedure described for busbarearthing.

4.5.3 Removing earthing connections

Disconnect and remove the shorting and insulatingpole.

Close the rear cover and bolt it firmly.

Remove the warning plates.

4.5.4 Earthing of busbars or cables with adrawout truck

Separate drawout trucks can be supplied optionally forbusbar and cable earthing. In case fault makingcapacity is required, a circuit breaker is mounted onsuch drawout trucks.

Procedure

Remove the circuit breaker or the link drawouttruck from the panel where earthing is to be done(refer clause 2.9.1).

Insert the desired earthing drawout truck i.e. cableor busbar earthing drawout truck in the panel (referclause 2.12.4).

Connect the LV plug and socket (refer clause 4.2.5).

Close the cubicle door (refer clause 4.6.2).

Ensure that there is no voltage available on the partto be earthed when earthing drawout truck withoutmaking capacity is used.

Transfer the drawout unit to the connected position(refer clause 4.2.3). In case the earthing drawouttruck has an electro-mechanical interlocking unitmounted on it, the transfer is possible only after allthe interlocking conditions are satisfied.

Lock it in the connected position.

27

In case the earthing switch is provided with electro-magnetic interlocks, ensure that all interlockingconditions are satisfied. Otherwise the earthingswitch cannot be closed.

Close the earthing switch by inserting the earthingswitch handle in position and turning it in theclockwise direction till stop. Withdraw the handle.

Place the warning plates at necessary locations.

4.5.6.2 Earthing Cables with Earthing Switch(Fig. 30)

Move the truck to test/disconnected position.Earthing switch cannot be closed until this positionis reached.

Ensure that the cables cannot be energized fromthe other end.

Follow the procedure for Busbar earthing switch.

4.5.7 Disconnection of Earthing Switches

Insert the earthing switch handle in position. Turnit in the anti-clockwise direction till it stops.Withdraw the handle.

Remove warning plates from location.

4.6 Breaker Compartment Door

The door can be opened and closed when the truck isin the test position and the plug-and-socket connectorfor the LV cables has been connected together.

The door interlock can be defeated as described underclause 5.5.

4.6.1 To open the door

Mount the handle on bolt of the door.

Rotate the handle anti-clockwise direction to openthe door.

Continue same way & tighten all bolts on the door.

4.6.2 To close the door

Mount the handle on the bolt of the door.

Rotate the handle in the clockwise direction toclose the door.

Continue same way and tighten all bolts on thedoor.

4.7 Low Voltage Compartment door

4.7.1 To open the door

Follow the procedure as given against clause 4.6.1.

4.7.2 To close the door

Follow the procedure as given against clause 4.6.2.

In case the drawout truck has a circuit breakermounted on it, switch it ON.

Place the warning plates at all necessary locations.

4.5.5 Disconnection of Earthing Drawout truck

Switch OFF the breaker in case of earthingdrawout truck with making capacity.

Transfer it to the disconnected position (referclause 4.2.2).

Disconnect the LV plug (refer clause 4.2.4).

Open the circuit breaker compartment door (referclause 4.6.1).

Remove warning plates.

Insert the original drawout truck of circuit breakeror link drawout truck in the panel (refer clause2.12.4).

Connect the LV plug (refer clause 4.2.5).

Close the door (refer clause 4.6.2).

The original drawout truck is now ready for transferto connected position.

4.5.6 Earthing the Busbars or Cables withEarthing Switch

4.5.6.1 Earthing the Busbars with Earthing Switch

Switch off the supply to the main busbars.

Ensure that the supply to main busbars cannot beswitched ON from remote points.

30.1 Earth switch (fixed contacts)30.2 Earth switch (moving contacts)5.1 Earth bus30.4 Flexible for earth switch connection to earth

Fig 30: Earth switch arrangement on cable side (Rear View)

30.1

30.2

5.1

30.4

28

5. Maintenance

5.1 Inspection Schedule

Each year

Make a general visual check for all parts/supports.

Check whether the accessories are complete andin proper order.

Lubricate the wheels and moving parts of thetruck and interlocking plate.

Every five years, in addition to checks carried outevery year

Transfer the drawout truck to the disconnectedposition.

Test-operate the circuit-breakers.

Remove the drawout trucks (refer clause 2.9.1)and carry out all maintenance work, also on theswitching devices.

Clean the panels and check the connections fortightness, if any.

Lubricate all bearing surfaces, bearings andarticulated joints.

Reinsert the drawout trucks.

Check the switchgear panel functions and putthe board back into service.

If work has to be carried out in the panels, isolate theboard, make sure that it cannot be made live again,check its isolated state and earth and short-circuit thefeeders and where applicable, the busbars. Adhere toall regulations and safety measures, maintain andservice the built-in equipment, e.g. circuit-breakers,vacuum contactors, voltage transformers, currenttransformers, relays, meters, protective devices, etc. inaccordance with their operating instructions.

Before removing the interlocking plate of the breakeroperating mechanism, discharge the closing andtripping springs.

Only standard tools are required. Put the switchgearback into service as described under clause 3 above.Service the switchgear at shorter intervals if the air isvery moist or full of dust or is otherwise polluted. Thecause of any disturbance or short-circuit must bedetermined immediately and damaged parts replaced,irrespective of whether an inspection is due or not.

5.2 Cleaning

Cleaning Agents:

Perchlorethylene, 1.1.1 trichloroethane, small brushes,dusters and vacuum cleaner.

Trichlorethylene, perchloroethylene andtetrachloroethylene and similar other agents have aharmful effect on cast-resin parts and must not comeinto contact with them.

Cast resin parts should be cleaned with either a cleandry cloth or cloth moistened with distilled water. Silverplated and other contact surfaces to be cleaned with aclean cloth.

5.3 Lubrication

Immediately after cleaning:

Lubricate the isolating contacts and their matingcontacts with neutral grease.

Apply a film of neutral grease to the bearings andarticulated joints of the operating mechanisms, tothe withdrawable parts and shutters, and to thedoor hinges and locks.

Using a wooden spatula to lubricate the auxiliaryswitches of the drawout unit with grease.

Recommended neutral greases are:

(i) SERVOGEM 2 (multipurpose) of Indian OilCorporation make.

(ii) Multipurpose Grease H of Hindustan PetroleumLtd. make.

(iii) Any other chemically neutral grease which canwithstand temperature upto 150C.

Lubricate non-current carrying parts withgeneral purpose grease.

5.4 Replacement of Parts

Items such as post insulators, bushings, measuringinstruments, current transformers etc., can bereplaced. If replacement is likely to prove difficult, askthe nearest Siemens representative in good time fordeputation of suitable personnel. The representativewill also assist you in deciding what spare parts to keepin stock.

When ordering spare parts and units, give thefollowing details:

Type and Serial No. of the equipment (seenameplate).

Exact description of the unit or part, referring to theappropriate operating instructions whereapplicable, or to a drawing, sketch or circuitdiagram.

5.5 Defeating the Door Interlock of HVCompartment

Caution : Take utmost care while defeating anyinterlock, as the defeat operation leads to access tothe areas / parts which are likely to be live.

5.5.1 Drawout Unit in Connected Position

The breaker compartment door interlock should onlybe defeated if the withdrawable part cannot be

29

transferred to the disconnected position and thesituation cannot be cleared in any other way.

Switch off the circuit-breaker.

Make sure that the busbars are not live.

Open all the locking bolts.

Open 2-M4 screws (28.10, Fig. 28) for emergencyrelease of the door.

Open the door (refer clause 4.6.1).

5.5.2 Drawout Unit in disconnected position

Press the leaf spring on interlocking plate by hand /small connector.

Insert the double-bit key in lock (28.7, Fig. 28) andturn it (locked) to Manual Racking.

Fit the hand crank (6.2, Fig. 6) to the hexagonshank in opening turn it clockwise as far as it willgo and pull it off (28.8, Fig. 28).

Turn the double-bit key clockwise through 90 fromposition Manual Racking to Connected Position(locked) and pull it off.

5.5.3 Restoring the Door Interlocks

After carrying out the operations to defeat the doorinterlock as described in clause 5.5.1 or clause 5.5.2,the door of the HV compartment can be closed andinterlocks can be restored by following the proceduresin clause 5.5.1 in the reverse sequence.

5.6. Maintenance Vacuum Circuit Breaker

5.6.1 Safety measures

DangerMaintenance, repair and subsequentconversion work may be carried out only byspecially trained personnel in accordancewith the operating instructions and/orspecial conversion instructions. Training and

information sessions for personnel can be providedby the competent Siemens department.

Before starting any work on vacuum circuit-breakers, reference must be made to the local safetyregulations for high-voltage switchgear. Switch offthe power supply and then close and open thevacuum circuit-breaker by hand (breaker in openstate closing spring charged indication not visible),to ensure that the closing spring is discharged.

Nonobservance can result in death, severe personalinjury or substantial property damage.

5.6.2 Inspection

Under normal operating conditions, the 3AH0 vacuumcircuit-breaker is maintenance-free. We recommendnonetheless a regular visual inspection to check forsoiling (e.g. dust, saline fog, fungus etc.) of the circuit-breaker.

5.6.3 Cleaning

To assure the insulating capacity, it is necessary thatthe insulating components are clean. Insulatingcomponents and external breaker parts must be wipedwith a damp cloth. Use only warm water with theaddition of a mild liquid household detergent ascleaning agent.

WarningWindings and terminals must not be touched if thepower supply has not been disconnected.

Nonobservance can result in death or serious personalinjury.

CautionAll springs of the operating mechanism must bedischarged and the vacuum-breaker be brought intothe open state, "Closing spring charged" indication notvisible.

Nonobservance can result in personal injury.

5.6.4 Abnormal operating conditions

If the 3AH0 vacuum circuit-breaker is used inabnormally unfavourable indoor conditions (e.g.frequent heavy condensation, dust-ridden air etc.), werecommend regular cleaning of the breaker externalcomponents and, if necessary, renewal of the anti-corrosion protection. Only the following products maybe used for the respective working parts of the VCB.

Bearings, sliding surfaces:Isoflex Topas L 32 grease

Bearings inaccessible to grease and bearings of theauxiliary switch S1:Ritzol Rostschutz 7-2 oil

Joints and bearings which cannot be dismantled mustnot be treated with a cleaning agent prior toreapplication of anticorrosives.

After renewal of the anti-corrosion protection, severalmechanical test-switching operations should beperformed on the vacuum circuit-breaker.

Lubricants (for special conditions) are available fromthe Siemens agency responsible:

30

5.6.5 Checking the contact system

The contact system is subject to wear both by contacterosion and by compression of the contact pieces andthe terminal bolts. To check the contact wear, amarking is provided on the lower interrupter support(Fig. 31). The position of the indicator (1) relative tothe stripe (2) in closing state indicates changes in thecontact system. The breaker may be operated onlywhen the indicator is within the range of the stripe.

5.6.6 Checking the vacuum

Such a check should be made if there is any risk of aninterrupter having developed a leak. Busbar and cableconnections must be disconnected. The check isperformed with an HV test unit. If necessary, furtherinformation may be obtained from the appropriateSiemens Regional Office.

5.6.7 Service Life

Under normal operating conditions, the circuit-breakers are designed for 10,000 operating cycles.Due to the optimization of the service life of all parts,the level of reliability falls if the breakers are used for agreater number of opening cycles. The manufacturercan therefore not recommend continued use of thecircuit-breakers, even if certain subassemblies arerenewed.

The permissible number of electrical operating cyclesas a function of the breaking current are available.When this permissible maximum has been attained,the complete pole assemblies must be renewed.Detailed instructions are supplied with thereplacement pole assemblies.

When ordering replacement pole assemblies, state thecircuit-breaker type, design code and serial number(refer name plate).

5.6.8 Accessories and spare parts

Owing to the fact that all parts of this breaker typehave been optimized to last the normal service life, it isno need to recommend any particular spare parts for

Fig 31: Checking the contact system

keeping in stock. Nevertheless, if you require furtherspare parts, state the following data when orderingthem:

1 Type designation, design code and serial number ofthe 3AH0 vacuum circuit-breaker (refer ratingplate).

2 For components not listed as spare parts, state thedesignation and part number, making reference toillustrations in these operating instructions or to aphotograph or sketch as applicable. Alternatively, asample may be submitted.

2

1

31

Sr. Work Materials Frequency Remarks No.

1 Circuit-Breaker1.1 Visual inspection and ... .... .... .... X Refer 'Inspection' (5.6.2).

cleaning if necessary ... .... .... ....1.2 Clean insulating components Warm water, X Refer 'Cleaning' (5.6.3).

& breaker external parts Household detergent1.3 Lubricate bearings & Isoflex Topas L32 grease X X Refer 'Abnormal operating

sliding surfaces. Ritzol Rostschutz 7-2 oil conditions (5.6.4) Perform 3 to 5 ON/OFF test ... .... .... .... X X

operations

2. Breaker pole2.1 Perform H. V test ... .... .... .... X

Replace vacuum interrupters ... .... .... .... X While ordering replacementafter 20000 operations interrupters, state CB type, design

code & sr. no. (refer rating plate)

3. Breaker operating mechanism3.1 Replace motor M1 ... .... .... .... X 3.2 Replace closing spring ... .... .... .... X

4. Examine & replace if necessary4.1 All electrical devices ... .... .... .... X 4.2 Shock absober if leaking ... .... .... .... X

Fig. 32

If re

quire

d

afte

r 250

0 m

ech.

ope

ratio

ns

afte

r 100

00 m

ech.

ope

ratio

ns

The following table lists the necessary work:

Maintenance schedule

32

5.6.9 3AH0 Breaker Spares List

Sr. Description MLFB SAP Code No

List of Spares for 3AH0

1 Switching pole complete (2.3, Fig. 2)

Switching Pole Comp. for 3AH0104-1, 26.3kA,800A 4393245001

Switching Pole Comp. for 3AH0104-2, 26.3kA,1250A 4393245002

2 Closing & Tripping Release (Y1/Y9) (9.7 & 9.12, Fig. 9)

Closing & Tripping On / Off Release 24V DC 3AY1510-3BY 4398095020

Closing & Tripping On / Off Release 30V DC 3AY1510-3MY 4398095021

Closing & Tripping On / Off Release 48V DC 3AY1510-3CY 4398095022

Closing & Tripping On / Off Release 60V DC 3AY1510-3DY 4398095023

Closing & Tripping On / Off Release 110VDC 3AY1510-3EY 4398095024

Closing & Tripping On / Off Release 125VDC 3AY1510-3NY 4398095025

Closing & Tripping On / Off Release 220VDC 3AY1510-3FY 4398095026

Closing & Tripping On / Off Release 240-250V DC 3AY1510-3GY 4398095027

3 Rectifier for Release 3AX15