SF6 Circuit Breakers-Live Tank
On the basis of more than 40 years experience in production of high voltage circuit-breaks that are in operation all over the world in all climatic zones, has developed a new generation of compact single-pole operated SF6 circuit-breaks with electrohydraulic or spring operating mechanism.
Pole Column

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 than delivered in transport units protected from the 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 and with optimizes moving and fixed parts.

SF6 circuit breaking chamber

The base of the pole column

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

The base is fully closed and thus completely protected from influence of the 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 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 

HIGH VOLTAGE SWITCHGEAR Inc.
ELEKTRICNI VISOKONAPONSKI APARATI d.d.

Borongajska bb, 10000 Zagreb, CROATIA
tel: +(385 1) 233033
 fax: +(385 1) 2318590
SF6 circuit breaking chamber ISO 9001_Certificate