Product Characteristics
SF6 Live tank circuit breaker, the interrupters are housed in porcelain insulators filled with SF6. 35kV to 145kV circuit breakers are equipped with spring operating mechanism. 252kV circuit breakers are equipped with spring and hydraulic spring operating mechanism. 550kV and 800kV circuit breakers are equipped with hydraulic spring operating mechanism. They all adopt self-energized arc extinguishing principle of "thermo-blast and auto-puffer". The circuit breaker can be used to control and protect and also can be used as contact circuit breakers to switch the capacitor bank.
Product Parameters
Rated voltage (kV) 40.5 72.5 126 252 550
Rated current (A) 2500 4000/5000 3150 4000 5000
Rated short circuit breaking current (kA) 31.5 40/50 40 50 63
Rated short time withstand current/duration (kA/s) 31.5/4 40/4,50/4 40/4 50/4 63/3
Rated peak withstand current (kA) 80 100 100 125 171
Rated power frequency withstand voltage (kV) To earth 95 350 230 460 740
Between open contacts 118 410 230+73 460+145 740+318
Rated lightning impulse withstand voltage (kV) To earth 185 160 550 1050 1675
Between open contacts 215 202 550+103 1050+200 1675+450
Rated switching impulse withstand voltage (kV) To earth
Between open contacts
Mechanical life (times) 10000 10000 10000 10000 6000