Self-energy arc extinguishing chamber and circuit breaker employing same

Abstract

The invention relates to a self-energy arc extinguishing chamber and a circuit breaker employing the same. The self-energy arc extinguishing chamber comprises a shell, wherein a piston cylinder barreland a piston cylinder bottom are arranged in the shell, a piston structure is arranged in the piston cylinder barrel and the piston cylinder bottom and moves in reciprocating way in response to breaking and closing operation of the arc extinguishing chamber, the piston structure, the piston cylinder barrel and the piston cylinder bottom form an air press chamber, a movable arc contact, a nozzle and an expansion chamber are arranged on the piston structure, the expansion chamber is corresponding to the movable arc contact and the nozzle, a pressure relief valve structure is arranged on the airpress chamber and is used for reducing pressure when the arc extinguishing chamber is broken, an air supplement passage is arranged on the air press chamber, and an air supplement valve structure isarranged on the air supplement passage and is opened to supplement air to the air press chamber when the arc extinguishing chamber is closed. The internal pressure of the air press chamber is abruptlyreduced during closing operation of the circuit breaker, the air supplement valve structure is opened, external sulfur hexafluoride gas rapidly enters the air press chamber through the air supplementpassage, the closing and air supplement operation is completed, the internal and external pressure difference is balanced, the closing resistance is effectively reduced, and the closing operation work is reduced.

Description

technical field [0001] The invention relates to the field of high-voltage switches, in particular to a self-energy type arc extinguishing chamber and a circuit breaker using the arc extinguishing chamber. Background technique [0002] The circuit breaker includes an arc extinguishing chamber and the corresponding operating mechanism. The common sulfur hexafluoride arc extinguishing chamber includes a compressed gas type arc extinguishing chamber and a self-energy type arc extinguishing chamber according to its arc extinguishing principle. The compressed gas type arc extinguishing chamber has an equipment volume Huge, complex structure, high engineering cost, large operating power of the mechanism, etc., especially the reliability of the mechanism of various large operating power is more prominent. Compared with the compressed gas type interrupter, the self-energy type interrupter can make full use of the energy of the arc itself to establish the blowing pressure, which can e...

AI Technical Summary

Problems solved by technology

[0007] The purpose of the present invention is to provide a self-energized arc extinguishing chamber to solve the technical problem of the closing resistance caused by the pressure reduction of the compression chamber when the current self-energizing arc extinguishing chamber is closed; at the same time, the present invention also provides A circuit breaker using the above arc extinguishing chamber

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