High-voltage direct-current circuit breaker

Abstract

The invention discloses a high-voltage direct-current circuit breaker comprising an alternating-current circuit breaker switch, a first power electronic circuit connected with the input end of the alternating-current circuit breaker switch at one end and used to convert direct current into alternating current, and a second power electronic circuit connected with the output end of the alternating-current circuit breaker switch at one end and used to convert alternating current into direct current, wherein the other end of the first power electronic circuit and the other end of the second power electronic circuit are connected to a direct-current transmission line. Through cooperation between the alternating-current circuit breaker switch and the power electronic circuits, direct current is converted into alternating current first, and then, alternating current is converted into direct current after arc extinguishing. Thus, direct-current arc extinguishing has the advantages achieved by alternating-current arc extinguishing, and the problem of long action time is avoided.

Description

technical field [0001] The invention relates to a circuit breaker, in particular to a high-voltage direct current circuit breaker. Background technique [0002] In recent years, due to the increasing popularity of high-voltage direct current transmission, a large number of scientific and technological personnel have devoted themselves to the research of high-voltage direct current transmission, among which the research focus is mainly on the direct current transmission scheme and the equipment in the direct current transmission line. The difficulty of high-voltage DC circuit breakers is that the DC current has no zero-crossing point, so it is difficult to realize arc extinguishing at the zero-crossing point of the current like alternating current. In order to realize the current zero-crossing arc extinguishing, the current zero point must be artificially created, so the existing high-voltage DC circuit breaker is composed of three parts: AC circuit breaker, an oscillating ci...

AI Technical Summary

Problems solved by technology

However, the high-voltage DC circuit breaker has two major disadvantages in turning the DC into a zero-crossing oscillation circuit to extinguish the arc: the first is that the development of the oscillation circuit is not yet mature, and the cost of use is relatively high; the second is the operating time of the device. difficult to meet

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