VGK-I-12 series indoor high voltage AC vacuum circuit breaker

VGK-I-12 series indoor high voltage AC vacuum circuit breaker

 

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• VGK-I-12 series indoor high voltage AC vacuum circuit breaker

  Summary

  VGK-I-12 series indoor high voltage AC vacuum circuit breaker (vertical rotary isolation type) is an indoor switchgear for 12kV power system. It is used as protection and control unit for power grid equipment and industrial and mining enterprises. The nature of the load and frequent operation, multiple occasions of short-circuit current. The product adopts the new circuit breaker operating mechanism, the vacuum interrupter and the main conductive circuit parts are solidly sealed in one part to protect the arc extinguishing chamber from collision, dust and condensation. The environment adaptability is strong, the operation and maintenance cost is greatly reduced, and the product is realized once. Partially maintenance-free, the operating mechanism is less maintenance; the operating mechanism is integrated with the circuit breaker and the isolating switch. It has been tested by type test and has E2 electrical life and M2 mechanical life.

  Main Technical Specification

  No.	Parameters name					Unit	Parameters
  							Circuit breaker	Load switch
  1	Rated voltage					kV	12
  2	Rated current of main busbar					A	630		1250
  3	Rated frequency					Hz	50
  4	Rated short time withstand current				Main circuit	kA	25	31.5
  					Ground circuit		21.7	27.4
  5	Rated short-time peak current				Main circuit		63	80
  					Ground circuit		54.5	68.5
  6	Rated short circuit withstand time				Main circuit	s	4
  					Ground circuit		2
  7	Rated short circuit closing current (peak)					kA	63	80
  8	Rated short circuit breaking current						25	31.5
  9	Rated short circuit breaking times					Times	30
  10	Rated operation sequence						O-0.3s-CO-180s-CO
  11	Mechanical life			Circuit breaker (load switch)		Times	10000
  				Three-position switch			5000
  12	Rated insulation level	1min power frequency withstand voltage (effective value)			Phase, to ground	kV	42
  					Fracture		48
  		Lightning impulse withstand voltage (peak)			Phase, to ground		75
  					Fracture		85
  		Power frequency withstand voltage of secondary circuit				V	2000
  13	Contact opening distance					mm	9±1
  14	Overtravel						3±0.5
  15	Interphase center distance						210±1
  16	Closing contact bounce time					ms	≤2
  17	Three phase asynchronous of opening						≤2
  18	Opening time When the operating voltage is		highest				17～55
  			rated
  			Minimum
  19	Closing time					ms	30～70
  20	Average opening speed (first 6mm average)					m/s	1.0～1.8
  21	Average closing speed (after 6mm average)						0.8~1.4
  22	Main conductive circuit’s resistance					μΩ	≤100
  23	Contact pressure					N	3200±150
  24	Opening contact’s rebound amplitude					mm	≤2

  VGK-I-12 series indoor high voltage AC vacuum circuit breaker

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