Indoor High Voltage Three-Station Vacuum Circuit Breaker

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Product Description

Product overview

VKF(C)-12GD series indoor high-voltage three-station vacuum circuit breaker has excellent electrical and mechanical properties, reliable and stable mechanism, long life. The main circuit adopts solid sealing pole, which improves the environmental adaptability and insulation reliability of the circuit breaker. Reliable mechanical and electronic performance and extended mechanical and electronic life make maintenance-free circuit breakers possible. It can be used in 3.6-12kV power system, as a power grid equipment, industrial and mining enterprises power design protection box control unit, suitable for a variety of different nature of the load and frequent operation, multiple times to break the short-circuit current occasions. The product has a perfect mechanical and electrical interlocking device, with high operational stability and reliability, to ensure the safety of operators and equipment, to ensure the safety of electricity.

◇ Using solid sealing pole technology.

◇ The product adopts modular design: frame structure, integrated isolation switch, solid sealed vacuum circuit breaker, ground switch, sensor, interlock mechanism, operating mechanism as one of the high-performance miniaturized high voltage electrical products.

◇ The dimensions of the adaptation cabinet are (500 x 1000 x 1800)mm

◇ Rotary isolation switch with visible fracture after opening. There is a forced mechanical interlock between the isolation switch, circuit breaker and ground switch to prevent misoperation.

◇ Circuit breaker adopts modular operating mechanism, can be independently replaced or repaired, good interchangeability. It can be operated manually, or AC and DC energy storage operation can be selected to achieve remote control.

◇ The cabinet door and ground switch are designed with a reliable interlock structure to ensure the safety of the operator.

Product definition

Environmental Conditions

◇ Ambient temperature: -25℃ +40℃;

◇ Relative humidity: daily mean value <95%, monthly average <90%;

◇ Altitude: no higher than 1000m;

◇ Seismic intensity: not more than 8 degrees:

◇ Place of use: no explosion risk, chemical and violent vibration and pollution.

◇ Altitude above 1000 meters use conditions

◇ At an altitude of more than 1,000 meters. The relative decrease in air density will affect the protection factor of the appliance.

◇ The user must make the calculation when selecting the switch.

◇ Recommended calculation method:

Find the height H of the specified location, calculate (formula 1) the relevant height coefficient Ka according to the provisions of GB311.1, multiply the lightning impulse withstand voltage and power frequency withstand voltage of the switch by Ka, and the obtained value is the voltage withstand parameter that must be achieved when the switch is used at a high altitude H, and at the same time in the environment below 1000 meters.

Main technical parameters

Content	Unit	Value
Rated voltage	kV	12
Rated short-time power frequency withstand voltage:phase/fracture		42
Rated lightning impulse withstand voltage (peak):phase/fracture		75/85
Secondary circuit power frequency withstand voltage (1min)	V	2000
Rated frequency	Hz	50
Rated current	A	630 1250
Rated short-circuit breaking current	kA	20	25	31.5
Rated peak withstand current	kA	50	63	80
Rated short-circuit closing current	kA	50	63	80
4s rated short-time withstand current	kA	20	25	31.5
Rated short-time withstand current duration	S	4
Rated single/back-to-back capacitor bank breaking current	A	630/400
Rated capacitor banks close inrush current	kA	12.5(frequency not greater than 1000Hz)
The number of times the rated short circuit current is broken	time	30
Mechanical life(disconnecting switch/breaker/ground switch)		3000/10000/3000
Allowable wear accumulative thickness of dynamic and static contacts	mm	3
Rated closing operating voltage	V	AC24/48/110/220 DC24/48/110/220
Rated opening operating voltage
Rated voltage of energy storage motor	V	AC24/48/110/220 DC24/48/110/220
Rated power of energy storage motor	W	70
Energy storage time	S	≤15
Contact opening distance	mm	9±1
overtravel		3.5±1
Contact closing bounce time	ms	≤2
Three phase division and closing are different		≤2
Switching time (rated voltage)		≤40
Closing time (rated voltage)		≤60
Average opening speed (contact minute~6mm)	m/s	0.9～1.3
Average closing speed(6mm ~contact just closed)		0.5～1.1
Contact opening rebound amplitude	mm	≤2
Contact closing contact pressure	N	2400±200(20-25kA)3100+200(31.5kA)
Rated operating sequence		O-0.3s-CO-180s-CO