12kV Spring Operated Vacuum Circuit Breaker_Vacuum Circuit Breaker Series_Medium-voltage Switchgears_Products

12kV spring operated vacuum circuit breaker is applicable to three-phase AC 50Hz rated voltage 3-10kV power system for switchgears for making, carrying and breaking current under normal circuit condition and for making, carrying and breaking current under abnormal circuit condition (for example, short-circuit condition). This device is widely applied various types of substations in power system and power generators, electrified railway, city subway, municipal construction, port construction, transportation, metallurgy and other applications. This vacuum circuit breaker has a service life of over 30,000 times as a whole and is maintenance-free for a long-term. It also meets relevant technical standards including GB1984, GB/T11022 and IEC60694.

S/N	Item	Unit	Parmeters
1	Rated voltage	kV	12
2	Rated frequency	Hz	50
3	rated power-frequency withstand voltage (1min) (phase-to-ground, phase-to-phase and phase-to-fracture)	kV	42/48
4	Rated lightning impulse withstand voltage (peak) (phase-to-ground, phase-to-phase and phase-to-fracture)	kV	95
5	Rated current	A	630/1250/1600/2000、2500/3150 /4000
6	Rated short-circuit open current	kA	25/31.5/40/50
7	Rated short-time withstand current (4 s)	kA	25/31.5/40/50
8	Rated short-circuit closing current (peak)	kA	63/80/100/125
9	Rated peak withstand current	kA	63/80/100/125
10	Rated short circuit current breaking times	times	30
11	Rated operation sequence		O-0.3s-CO-180s-CO
12	Closing / opening time	ms	≤70/≤50
13	Rated operating voltage	V	AC110/220 DC110/220
14	Mechanical life	times	30000/20000

This vacuum terminal post uses advanced automatic pressure gelatin process (APG) to directly seal small ultra-low resistance vacuum arc extinguishing chamber and other parts of the main circuit in epoxy resin, which simplify the assembly process of terminal post, prevent any loosening caused by vibration of connecting bolts of conductor circuit in the vacuum arc extinguishing chamber due to movement, thus improving reliability. The surface of the vacuum arc extinguishing chamber is not affected by external mechanical force and external environment, which further improving electric field distribution on the terminal post.

High-performance break-brake buffer is used, which significantly reduce the overshoot and bounce amplitude of moving contacts in the process of circuit breaker opening, which in turn significantly reduce the possibility of arc reignition and restrike.

A new integrated spring-operated mechanism is used with reasonable structure and load, reliable performance and long mechanical life.

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