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Live Tank Circuit Breakers

Each column consist of interrupter unit, post insulators, operating rod, crank case assembly and base with operating mechanism system and control unit.

The pole columns are assembled, adjusted and tested in the factory and then delivered and protected from any climate influence during transport and storage. The interrupter unit (SF6 circuit breaking chamber) is puffer-type with high performance contact system with two movable nozzles and movable blast cylinder with contact fingers which optimizes moving and fixed parts.



SF6 circuit breaking chamber

 

The base of the pole column

The base od the circuit breakers is made of steel supporting structure which contains components of hydraulic or spring operating mechanism system.

The base is fully closed and thus completely protected from the influence of environment. The drive energy required for operation of circuit breakers pole is transmitted from the hydraulic storage cylinder or spring tension and operating mechanism via the crank case assembly and operating rod to the interrupter unit.

The excellent reliability of the electrohydraulic operating mechanism has been gained with compact design of the hydraulic block with minimal number of pipe connections.

Technical Data
Rated voltage kV 72.5 123 145 170 245 300 362 420 550
Design A,B                     C,D                D
Rated light impulse
withstand voltage (1.2/50 µs)

kV 325 550 650 750 1050 1050 1175 1425 1550
Rated power frequency
withstand voltage (1 min)
kV 140 230 275 325 460 380 450 520 620
Rated normal current A 1500...3150 ...3150
Rated breaking current kA 25 - 31.5 - 40 40-50 31.5 - 40
Rated short time current (1/3 s) kA 25 - 31.5 - 40 40-50 31.5 - 40
Rated peak withstand current kA 63 - 80 - 100 100-125 80 - 100
Rated duty cycle O - 0.3 s - CO - 3 min - CO or CO - 15 s - CO

 

Design A, B
Design C
Design D

 

Un(kV) 72.5 123 145 170 245 300 362 420 550
Design
A,B A,B A,B A,B C D D D D D
p(mm)
1350 1700 1850 3000 3000 3000 3000 4000 4000 4600
h(mm)
4385 5185 5435 5885 7472 5837 5837 6337 7179 7679
h1(mm)
1295
1695
1845
2095
2600
2462
2462
2962
3840
4340
h2(mm)
2150
2150
2150
2150
2500
2500
2500
2500
2500
2500
all other values by request