Vacuum circuit-breakers series BP are ideally suitable for switching and protection operations in MV grids. Circuit-breakers series BP are used for switching loads of any types at rated currents of up to 3150 A and breaking currents of up to 40 kA. Circuit-breakers series BP are designed on the basis of the unified design concept, namely: using cast epoxy compound poles; using the versatile electromagnetic drive, which acts as a magnetic latch and is controlled by an electronic block housed in the circuit-breaker frame.
Vacuum circuit-breakers series BP type BP6B are mainly used for replacement of VES-6 electromagnetic circuit-breakers in KE-6S switchgears at thermal and nuclear power plants.
Specifications:
- Rated voltage (kV): 6
- Rated current (A): 1600, 3150
- Rated breaking capacity (kA): 40
- Peak withstand current (kA): 128
- Mechanical lifetime: up to 30000 CO cycles
- Electrical lifetime: up to 30000 CO cycles
- Electrical lifetime at rated breaking current: up to 50 O cycles
Design
All circuit-breakers series BP type BP6B consist of three poles with vacuum interrupters filled with cast epoxy compound. In circuit-breakers series BP6B rated for 2500 A and 3150A currents, vacuum interrupters and terminals are mounted on insulating supports. The circuit-breaker electromagnetic drive fixing circuit-breakers in C and O positions on magnetic latches is housed in the circuit-breaker frame. The circuit-breaker shaft is connected via insulating rods with vacuum interrupters and when turning, it controls circuit-breaker position contacts for external auxiliary circuits. In circuit-breakers rated for 2500 A and 3150 A currents, pole tie-rods are fitted with groups of coiled pressing springs.
10 kV Vacuum Circuit-Breakers
