Outdoor vacuum circuit-breakers of series BP35NS fitted with organosilicon and air insulation of poles (without transformer oil) and electromagnetic drive with using the concept of two-position magnetic latch are designed for switching HV electrical circuits in normal and emergency modes in three-phase alternating current networks of 50 (60) Hz frequency and 35 kV rated voltage with ungrounded or partially grounded neutral.
Circuit-breaker series BP35NS are used in 35 kV outdoor switchgears of modular transformer substations types KTPBR-220/35/10(6), KTPBR-150/35/10(6), KTPBR-110/35/10(6), KTPBR-М-35/10(6) and blocks of complete switchgears in railway traction substations as well as for extension of existing substations and replacement of outdated air and oil circuit-breakers at them.
Specifications:
- Rated voltage (kV): 35
- Rated current (A): 1600
- Rated breaking capacity (kA): 20
- Peak withstand current (kA): 52
- Mechanical lifetime: 30000 CO cycles
- Electrical lifetime at rated currents: 30000 CO cycles
- Electrical lifetime at rated breaking currents: 55 CO cycles
Design
Circuit-breakers series BP35NS consist of four main parts, namely:
- a frame housing an electromagnet
- a cubicle housing control PCBs and a manual switch-off mechanism
- a supporting frame with four mounting holes
- a pole consisting of insulating envelopes with organosilicon insulation and vacuum interrupters
The pole of BP35NS circuit-breaker consists of vacuum interrupter, supporting covers, insulating tie-rod, upper and lower terminals, fasteners and parts for sealing the pole. Upper and lower parts of the pole are made of fibreglass pipe externally covered with finned organosilicon insulation.
Елементи підстанцій