S W I T C H G E A R C O M P L E X

SF6-GAS CIRCUIT BREAKERSFOR OUT-DOOR USE (72.5 TO 245 kV)

SWITCHGEAR COMPLEX

INTRODUCTION

Crompton Greaves Ltd. is one of the leading manufacturers of SF6 Gas Circuit Breakers in the world. We manufacture GasCircuit Breakers ranging from 6.6kV to 420kV .More than 13,000 Crompton Greaves SF6 Gas Circuit Breakers upto 420kV have been put into service in variousenvironments in many countries since 1983 where they are operating satisfactorily.Our manufacturing and quality systems are ISO 9001 certified.

SFM TYPE SF6 GAS CIRCUIT BREAKER (SPRING-SPRING MECHANISM)

Crompton Greaves manufactures SFM type Outdoor SF6 Gas Circuit Breakers (GCBs) ranging from 72.5kV to 245kV.These GCBs are of live tank design, with motor / manual charged spring-opening spring-closing operating mechanism andare capable of interrupting all possible switching duties. The breakers are single break interrupter design and employdual flow puffer action for current interruption ensuring high operational reliability and safety of power transmis-sion and distribution systems.The GCBs are capable of clearing the severe rate of rise of recovery voltage due to short line faults and high recoveryvoltage peak due to out of phase switching. Small currents such as capacitor bank switching current,transformer magnetizing current, cable / line charging current, are interrupted smoothly without any re-strikes orre-ignition and the over-voltages observed are minimum.

FEATURES

• Simple and compact design.

• Line to ground clearances as per customer specification.

• Self aligning contacts for easy re-assembly.

• Single break design.

• High seismic withstand capability – earthquake safety.

• Complete range tested at CESI, Italy; KEMA, Netherlands and CPRI, India.

• Inspection / maintenance of pole unit possible without dismantling the breaker.

• Easy erection.

• No site adjustments.

• Low operating noise levels.

CONSTRUCTION & OPERATION

Depending upon the application, type SFM GCBs are divided into two types as follows;Three phase auto re-closing circuit breaker with one common mechanism for Transformer applications.Single / Three phase auto re-closing circuit breaker with three separate spring mechanisms (for each phase) for Lineapplications.

The breaker consists of three main parts :

1. Vertical porcelain units containing puffer type interrupter

2. Spring-spring operating mechanism and control equipment in a single housing

3. Base Frame and support columns

SPRING - SPRING OPERATING MECHANISMThe spring-spring mechanism consists of two springs – Closing spring and Tripping spring. Closing spring is chargedthrough a motor driven cam, pawl and ratchet mechanism.Fig.4 shows the Breaker in Closed position ( Closing spring charged )Both closing spring and tripping spring are in charged position. The Tripping spring exerts counter clockwise torque on thelever. At this stage a locking device called ‘Trip Holding Latch’ avoids lever movement. When the trip coil is energized, thelever is released from locking device and rotates to attain the ‘Open’ position.Fig.5 shows the Breaker in Open positionTripping spring is in the relaxed condition. Closing spring exerts counter clockwise torque on the Cam and Ratchet wheel.When the Closing coil is energized, the Cam rotates in counter clockwise direction and in turn, the Lever is rotatedclockwise. This lever motion closes the breaker and charges the Tripping spring at the same time.Fig.6 shows Closed position ( Closing spring discharged )Immediately after the breaker is closed, the spring charging motor gets activated. The closing spring is charged by theratchet, linked to the motor. When the closing spring is fully charged the Limit Switch disconnects the supply to themotor and the closing -holding latch holds the compressed spring energy till next discharge.

Interrupter

Trip-holding latch

Lever

Ratchet

CamTrip spring

Closing spring

Ratchet wheel

Closing-holding latch

Closing trigger

Closing coil

Trip coil

Trip trigger

SPRING OPERATING MECHANISM

FIG. 4 : Closed position (closing spring charged)

FIG. 5 : Open position (closing spring charged) FIG. 6 : Closed position (closing spring discharged)

ROUTINE TESTINGAll routine tests as specified in IEC 56 are conducted on the fully assembled GCBs at our factory. In addition to thespecified tests as per IEC, following tests are also carried out on each breaker.1) Gas leakage test.2) Speed and timing test.3) Gas pressure switch test.

CG testing laboratory is fully equipped with the latest testing equipment viz.

1) 600kV test transformer – Programmable logic control MUR 24A.2) High precision mass spectometer type gas leak detector (with capability to detect leaks as low as 1 ppm).3) Multi-channel breaker Speed / Time analyser.4) Milli-Volt drop test set.5) Primary injection test set.Full testing before despatch of breaker ensures trouble free operation at site and complete customer satisfaction.

QUALITY AND SURFACE TREATMENTAll critical components and sheet metal stampings are manufactured on CNC machines ensuring high dimensionalconsistency. All parts coming in contact with moisture are zinc/cobalt black passivated. All exposed ferrous parts aretreated to give high corrosion resistance. They are shot blasted, spray galvanised, primer coated and finally painted withpolyurethane based paint or epoxy paint ensuring excellent finish and protection. All joints are secured against looseningby using torque wrenches and other suitable means. All hardwares are of Stainless steel or Hot Dip Galvanised.

TRANSPORT AND SITE INSTALLATIONAll the circuit breakers are factory tested and then depending upon the type involved are partly dismantled into packingunits and despatched. All the subassemblies are individually wrapped to reduce the harmful effects of atmospheric air. Forexports, the breakers are despatched with seaworthy packing. The circuit breaker poles are filled with a small quantity ofSF6 gas for transportation (at a gauge pressure of 0.5 kg/cm2) to avoid moisture ingress and site evacuation. Siteinstallation is simple and no site adjustments are required during erection and commissioning, all main adjustments /settings are done in the factory prior to delivery.

CUSTOMER SUPPORT AND AFTER SALES SERVICEWe provide solutions to all possible technical requirements of customer through our highly qualified engineers having richexperience in the field.Our service engineers, technicians and authorized representatives can provide supervision of erection and commissioningand after sales service at site.

VACUUM PUMP[712]

LARGE DIA HOSE [714]

ADAPTER V [713]

TEMPERATURECOMPENSATEDGAS PRESSURE

SWITCH [401]

GAS PRESSUREGAUGE [402]

O RING P18[408]

COVER [404]

GAS FEED PORT [403]

VALVE D [405]

VALVE E [406]VALVE E [406]VALVE E [406]

PHASE CPHASE BPHASE A

GAS PIPE DIAGRAM

Spring Mechanism 72/145kV - Closing Spring

Spring Mechanism 72/145kV - Opening Spring (Rear View)

GUARANTEED TECHNICAL PARTICULARS72.5 - 245kV SF6 GAS CIRCUIT BREAKER ( SPRING - SPRING MECHANISM )

SN DESCRIPTION UNITS (3 PHASE AUTO RE-CLOSING) (1 PHASE AUTO RE-CLOSING)

1. TYPE REFERENCE : - 70-SFM- 120-SFM- 120-SFM- 120-SFM- 150-SFM- 70-SFM- 120-SFM- 120-SFM- 150-SFM- 200-SFM- 200-SFM-32B 32B 32B 32B 32B 32B 32B 32B 40B 40S 40S

2. RATED VOLTAGE : kV 72.5 123 145 145 170 72.5 123 145 170 245 2453. RATED LIGHTNING IMPULSE :

kVp 350 550 650 650 750 350 550 650 750 1050 1050WITHSTAND

4. RATED POWER FREQUENCY: kV 160 230 275 275 325 160 230 275 325 460 460

WITHSTAND5. CREEPAGE DISTANCE (TOTAL) : mm 1815 3075 3625 3625 4250 1815 3075 3625 4250 6125 61256. APPLICABLE STANDARDS : - IEC : 62271-100-2005, BSS : 5311, JEC : 181, IEC : 606947. TYPE OF MECHANISM : - SPRING-SPRING8. RATED NORMAL CURRENT : A 31509. RATED OPERATING SEQUENCE : - 0-0.3 sec-CO-3 min-CO / CO-15 sec-CO 0-0.3 sec- 0-0.3 sec-CO-3 min-CO / 0-0.3 sec- 0-0.3sec-CO-3min-CO /

CO-1min-CO CO-15 sec-CO CO-1min-CO CO-15sec-CO10.RATED FREQUENCY : Hz 50/60 50 50/60 50 6011.RATED DURATION OF SHORT

: sec. 3CIRCUIT

12.RATED CLOSING/TRIPPING VOLTAGE : V 110/125/220 V DC13.CURRENT OF CLOSING /

: A 7 A max. at 110 V DC6A max. at

7 A max. at 110 V DC6A max. at

7 A max.TRIPPING COIL 110V DC 110V DC

14.MOTOR VOLTAGE : V 110/125/220 V DC / 230 V AC15.RATED BREAK TIME : mS 60 5016.RATED CLOSING TIME : mS 130 135 130 135 15017.RATED SHORT CIRCUIT

: kA 31.5 40 25 31.5 40BREAKING CURRENT

18.RATED SHORT CIRCUIT MAKING: kAp 80 100 62.5 80 100 104

CURRENT19.RATED LINE CHARGING BREAKING

: A / pu 10/<2.5 50/<2.5 10/<2.5 50/<2.5 125/<2.5CURRENT AND OVER VOLTAGE

20.RATED CABLE CHARGING BREAKING: A / pu 250/<2.5 160/400/<2.5 160/<2.5 250/<2.5 160/400/<2.5 160/<2.5 250/<2.5

CURRENT AND OVER VOLTAGE21.RATED SINGLE CAPACITOR BANK

BREAKING CURRENT AND OVER : A / pu 250/<2.5 400/<2.5 250/<2.5 400/<2.5VOLTAGE.

22.RATED OUT OF PHASE BREAKING: kA 7.9 10 6.25 7.9 10

CURRENT23.FIRST POLE TO CLEAR FACTOR : - 1.524.AUXILLIARY CONTACTS : - 8 NO + 8 NC 8 NO + 8 NC / POLE25.SF6 GAS PRESSURE (AT 20°C)

- NORMAL : Kg/cm2 5 6 7 5 6 7 8- GAS FEED ALARM : Kg/cm2 4.5 5.5 6.5 4.5 5.5 6.5 7.5- LOCKOUT : Kg/cm2 4 5 6 4 5 6 7

26.DIMENSIONSA : mm 1100/1700 1700 1700 1700 2200 3470 3470 3470 3470** 4600 4600B : mm 3070 3490 4010 4010 4350 3070 3490 4010 4350 4602 4602D : mm 1600 2000 2000 2000 2200 — — — — — —H : mm 4038 4908 5612 5502 6104 4038 4908 5428 6104 7146 7146

27.WEIGHT (Approx.) : Kg 1100 1400 1450 1450 2200 2100 2360 2460 3900 3000 3000 **Adjustable

OPTIONALSSN DESCRIPTION UNITS (3 PHASE AUTO RE-CLOSING) (1 PHASE AUTO RE-CLOSING)

1. CREEPAGE DISTANCE mm / kV 31,35,40 31,35,40,45 31,35,40 25,31 25,31 31,35,40 31,35,40 31,35,40 25,31 25,312. CLOSING / TRIPPING COIL VOLTAGE V DC 48 / 60 / 125 125/250 48 /50 / 125 125 / 2503. CLEARANCE OF LIVE PARTS TO

- AS PER CUSTOMER SPECIFICATIONSGROUND

4. MAX. ALTITUDE ABOVE SEA LEVEL m 1700 1000 1000 1000 1000 1700 1000 1000 1000 1000 10005. AUXILLIARY CONTACTS - 10 NO + 10 NC 10 NO + 10 NC / POLE6. SEISMIC ACCELERATION g 0.3 / 0.5 0.3 0.3 / 0.5 0.3 / 0.5

3540

35

R180

15.5

44.5

140

Ø18 DRILL4 HOLES

140

64 44.5

DETAILS ‘B’LOWER TERMINAL PADS

Ø14 DRILL4 HOLES

12

DETAILS ‘A’UPPER TERMINAL PADS

15.5

140

6444.5

44.5

140

4040

40

Ø14 DRILL4 HOLES

Ø18 DRILL4 HOLES

520

800

2128

520 520 540813

‘x’

CONCRETELEVEL

B

GROUND LEVEL

SUPPORTINGPORCELAINS

INTERRUPTINGPORCELAIN

PHASE ‘R’ PHASE ‘Y’ PHASE ‘B’

‘B’

H

‘A’AA

LEVEL OF UNDRILLEDGLAND PLATE

100DETAILS OF ‘X’

CLØ30

100

Dimensional Details Foundation Plan Details

THREE PHASE AUTO RECLOSING TYPE GCB

72.5 - 145 kV breaker (1 - break)

SINGLE PHASE AUTO RECLOSING TYPE GCB

a) 72.5 - 145 kV breaker (1 - break)

b) 245 kV breaker (1 - break)

Foundation Bolt Details Terminal Pad Details

72.5 to 145 kV (1Ø / 3Ø) 245 kV (1Ø) 72.5 to 145 kV (1Ø / 3Ø) 245 kV (1Ø)

700280

240

300

SUGGESTED TRENCHFOR CABLE ENTRY

D

280 525 795

376

250

80

FLANGE(340x300)

CEMENT

A A

D

2220

B

H

700

CONCRETE LEVELGROUND LEVEL

SUPPORT PORCELAIN

BASE FRAME

INTERRUPTERPORCELAIN

MECHANISM HOUSING

SUPPORT COLUMN

A A

1085PH.A

1085PH.B

1085PH.C

2220

BH

700

CONCRETE LEVELGROUND LEVEL

SUPPORTPORCELAIN BASE FRAME

INTERRUPTERPORCELAIN

MECHANISMHOUSING

SUPPORTCOLUMN

A A700280

300

240

1085250 80

CEMENTFLANGE(340x300)

CABLE TRENCH

FOUNDATION DESIGNDETAILS FOR VIEW "A","B" AND "C"

400

50

400

100

SUPPORT STRUCTURE

-8-M24 FOUNDATION BOLTS

FOUNDATION BOLTS

250

Data subject to change

Cat.No.105(12/05/3K)

Power SystemsA Business Unit of Crompton Greaves Ltd.Switchgear ComplexA-3, MIDC, Ambad, Nashik - 422 010 IndiaTel : (+91) 253 2301661 to 74Fax : (+91) 253 2381247, 2382219 (Dir.)E-mail : ranjan.pendharkar@cgl.co.inURL : www.cglonline.comRegd. Office :6th Floor, CG House, Dr. Annie Besant Road, Worli, Mumbai - 400 030, India.

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