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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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