TECHNOLOGY TO THE FORE
SWI TC H G EAR
C O M P L E X
SF6-GAS CIRCUIT BREAKERS
FOR OUT-DOOR USE UPTO 36kV
CG Switchgear and Control
A Business Unit
of Crompton Greaves Ltd.
TECHNOLOGY TO THE FORE
SW I TC H G EAR
C O M P L E X
INTRODUCTION
More than 9000 Crompton Greaves SF6 Gas
Circuit Breakers with puffer type interruptors upto
420 kV have been put into service in various
environments in many countries since 1983 where
they are operating satisfactorily.
Type SFGP SF6 Circuit Breakers are of live tank type
with rated voltage of 24 & 36 kV. Each breaker
consists of three puffer type interruptors,
providing a high insulation as well as an excellent
breaking capability, a spring operating mechanism
ensuring high operational reliability.
All our SF6 Gas Breakers (24 to 420 kV) adhere to
the requirements of the quality standards and scope
of supply of ISO 9001, 1994.
FEATURES
INTERRUPTER UNIT - FIG1
Absorbent
Stationary contact holder
Stationary contact
Gas flow
Arc
Nozzel
Moving arc contact
Moving main contact
These SF6 Gas Circuit Breakers are extremely simple
Piston
Puffer cylinder
and compact in their design owing to the fact that
Main contact
no gas blast valves or exhaust valves are required
and the force of contact separation simultaneously
Contact spring
drives the puffer piston, which builds up the gas
pressure according to the contact stroke. The structural simplicity results in high performance
reliability and, therefore, minimal inspection and
re-assembly. Also this ensures that the OPERATING MECHANISM - FIG2
maintenance time is low. Inspection is simple and
Closing trigger
Plunger core (closing coil)
easy since the interrupting medium, which is also
Roller
Hook
the insulating medium, is monitored with ease
Interlock spring
Closing latch
through clearly readable pressure gauges and
Link
Cam roller
mechanical as well as electrical interlocks.
Motor
The breaker opens from front as well as back
panels to provide easy access to all parts of the
Closing cam
mechanism. The checking or replacing of fixed, Spur gear
moving or arc contacts and nozzle can be done by
removing only the upper terminal of the interruptor
unit as and when required. This operation does not Eccentric crankshaft
Ratchet wheel
require the breaker to be dismantled and it takes
Pawls
Main shaft
only a few hours to put the breaker back into
Main-shaft lever
service.
Roller
The low operating noise level of the spring charged
operating mechanism used in this breaker enables
Tripping spring
its use in residential areas. All exposed ferrous parts
are treated to give high corrosion resistance and
are finally painted with polyurethane based paint
Exploded schematic view of
ensuring excellent finish and protection. The breaker
the operating mechanism
has been made extraordinarily simple and light to
increase safety in the event of earthquakes.
Plunger core (tripping coil)
Hook
Tripping trigger
Roller lever
Cam shaft
Crank lever
Crank pin
Connecting
rod
Push rod
Tripping latch
Latch arm
Closing
spring
TESTS AND PERFORMANCE
The performance and reliability of these breakers and their excellent interrupting capability has been verified at renowned
international testing laboratories like CESI, Italy and CPRI, India. The breakers are type tested for short circuit duties and capacitive
current switching test as per IEC 56-1987
EASE OF INSTALLATION
Since these units are shipped in two parts - namely the pole unit and the mechanism - minimal site preparation is required and setup
time is very low.
DESIGN
The interrupting unit (FIG.1) is puffer type and is contained in a porcelain insulator and the terminals. During interruption the puffer
cylinder is quickly driven downwards with its attached parts by the operating mechanism (from the breaker "closed" position to the
breaker "open" position). The gas within the puffer cylinder is compressed by the piston and blown to the arc through the nozzle
achieving arc extinction.
The operating mechanism (FIG.2) is an easy to handle motor charged spring type. It also permits manual operation of the breaker. High
reliability has been ensured by keeping the number of components to a minimum and, therefore, maintenance required is easy and
minimal.
GUARANTEED TECHNICAL PARTICULARS
24 / 36 kV SF6 GAS CIRCUIT BREAKER
UNITS
1.
2.
3.
4.
5.
6.
7.
8.
9.
10.
11.
12.
13.
14.
15.
16.
17.
18.
19.
20.
21.
22.
23.
TYPE REFERENCE
RATED VOLTAGE
RATED LIGHTNING IMPULSE WITHSTAND VOLTAGE
RATED POWER FREQUENCY WITHSTAND
CREEPAGE DISTANCE (TOTAL)
APPLICABLE STANDARDS
TYPE OF MECHANISM
RATED NORMAL CURRENT
RATED SHORT CIRCUIT BREAKING CURRENT
RATED SHORT CIRCUIT MAKING CURRENT
RATED OPERATING SEQUENCE
RATED FREQUENCY
RATED BREAK TIME
RATED CLOSING TIME
RATED CLOSING / TRIPPING VOLTAGE
CURRENT OF CLOSING / TRIPPING COIL
FIRST POLE TO CLEAR FACTOR
RATED DURATION OF SHORT CIRCUIT
RATED CABLE CHARGING BREAKING
CURRENT AND OVER VOLTAGE.
RATED SINGLE CAPACITOR BANK BREAKING
CURRENT AND OVER VOLTAGE.
RATED OUT OF PHASE BREAKING CURRENT
AUXILLIARY CONTACTS
SF6 GAS PRESSURE (AT 20 ºC)
-NORMAL
-GAS FEED ALARM
-LOCKOUT
24 kV
36 kV
:
:
:
:
:
:
:
:
:
:
:
:
:
:
:
:
:
:
:
kV
kVp
kV
mm
A
kAp
kA
Hz
ms
ms
V
A
sec
A / pu
20-SFGP-25A
30-SFGP-25A
30-SFGP-40A
24
36
150
200
60
80
600
916
IEC 56, BS 5311 & JEC 181
SPRING CLOSING / TRIPPING
1250, 1600, 2000
25 & 40
25
62.5
62.5 & 100
O-0.3 sec-CO-15 sec-CO
50 / 60
80
100
110 / 220 VDC
5 at 110 VDC
1.5
3
50, <2.5
:
A / pu
440, <2.5
:
:
kA
-
:
:
:
Kg / cm2
Kg / cm2
Kg / cm2
6.25
6.25 & 10
5 NO + 5 NC
5
4.5
4
OPTIONALS
1.
2.
3.
4.
5.
6.
7.
CREEPAGE DISTANCE
CLOSING / TRIPPING COIL VOLTAGE
CLEARANCE OF LIVE PARTS TO GROUND
ALTITUDE ABOVE SEA LEVEL
AUXILLIARY CONTACTS
LIGHTNING IMPULSE WITHSTAND VOLTAGE
EARTHQUAKE WITHSTAND (SEISMIC ACCELERATION)
25, 31, 35 mm / kV
24 / 30 / 60 / 110 / 125 / 220 VDC
AS PER CUSTOMER SPECIFICATION
UPTO 2500 M
10 NO & 10 NC
250 kVp
0.3 g / 0.5 g
FOUNDATION PLAN DETAILS
250
GENERAL OUTLAY
FOUNDATION BOLT
(M24×400) LOCATION
50
B
80
A
450
900
A
1
F
2
480
1100
3
C
G
DETAILS OF TERMINAL PAD
(MATERIAL - AL, 22 THK)
4
Ø15, 4 HOLES
Ø14, 4 HOLES
5
BREAKER
SIDE
40
15
40
CONDUCTOR
SIDE
16
44.5
D
H
150
44.5
40
E
1.
2.
3.
4.
5.
60
140
INTERRUPTER
SUPPORT PORCELAIN
BASE FRAME
MECHANISM HOUSING
SUPPORT STRUCTURE
DIMENSIONS (mm)
A
B
C
D
E
F
G
H
TOTAL WEIGHT (Kg)
20-SFGP-25A
(24 kV)
600
1560
3349
680
1025
522
2783
502
675
30-SFGP-25A
(36 kV)
750
1860
3819
680
1225
672
3103
502
750
30-SFGP-40A
(36 kV)
750
1860
4079
680
1290
976
3103
502
750
GAS SYSTEM
A-Phase
B-Phase
Temperature
compensated
pressure switch
C-Phase
Arcing column
Gas pipe
Stop valve
Pressure gauge
Stop valve
Blind cap
CG Switchgear and Control
A Business Unit of Crompton Greaves Ltd.
Switchgear Complex
A-3, MIDC, Ambad, Nashik - 422 010 India
Tel:
(+91) 253 382271 to 75 Ext 107/108/110
Fax:
(+91) 253 382219/381247
E-mail: exports@cglmail.com (Exports)
mktg@cglmail.com (General)
URL: www.cgswgear.com
The Thapar Group
CG-S&C/EXP/Cat.No.SF6-102/3/01/2000
Regd. Office :
6th Floor, CG House, Dr. Annie Besant Road,
Prabhadevi, Mumbai -400 025, India.
Data subject to change