Vacuum arc-extinguishing chamber, vacuum arc-extinguishing chamber contacts and direct current vacuum circuit breaker

Abstract

The invention relates to a vacuum arc-extinguishing chamber, vacuum arc-extinguishing chamber contacts and a direct current vacuum circuit breaker. The direct current vacuum circuit breaker comprises an operating mechanism and the vacuum arc-extinguishing chamber, wherein the vacuum arc-extinguishing chamber comprises a moving contact and a fixed contact; arc-extinguishing gate pieces are arranged on the end plane, facing to the fixed static, of the moving contact, or the end plane, facing to the moving contact, of the fixed contact; the arc-extinguishing gate pieces are extended in the radial direction of the moving contact or the fixed contact, and are uniformly distributed in the circumferential direction; and the direct current vacuum circuit breaker also comprises a magnetic field apparatus used for generating a transverse magnetic field for enabling electric arc to rotate along the axial line of the vacuum arc-extinguishing chamber. When a switch-off action is implemented, the electric arc is sent to the gaps of the arc-extinguishing gate pieces under magnetic blowing force generated by the transverse magnetic field in the electric arc movement process, and the electric arc is cut into multiple series-connected short arcs under the function of the arc-extinguishing gate pieces; the electric arc is stretched, and meanwhile, a series of proximal-polar voltage drops occur on the surfaces of the gate pieces; and in addition, the electric arc is further cooled by the gate pieces, so that the electric arc is extinguished rapidly, and disconnection for the high voltage direct current is realized.

Description

technical field [0001] The invention relates to a vacuum interrupter, a vacuum interrupter contact and a DC vacuum circuit breaker. Background technique [0002] The multi-terminal DC transmission and DC grid technology based on flexible DC is one of the effective technical means to solve the problem of new energy grid connection and consumption, and the high-voltage DC circuit breaker is the key equipment for building a DC grid, which is very important for the safety of the DC transmission system and DC grid. Reliable operation plays an extremely important role. However, under the condition of high voltage and high current, how to solve the problem that the DC current has no natural zero-crossing point and is difficult to break, and the DC short-circuit current rises rapidly, requiring it to be broken within a few milliseconds has plagued academic circles at home and abroad. Therefore, it is known as a century-old problem in the field of electric power technology. [0003...

AI Technical Summary

Problems solved by technology

[0012] The purpose of the present invention is to provide a vacuum interrupter to solve the problem that the existing DC circuit breaker cannot break the faulty DC current and the cost is too high

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