High-voltage direct current vacuum circuit breaker based on intermediate frequency transfer current

Abstract

The invention discloses a high-voltage direct current vacuum circuit breaker based on the intermediate frequency transfer current, and relates to a high-voltage direct current power switch. According to the high-voltage direct current vacuum circuit breaker, a transfer loop with certain parameters is designed on the basis of the existing vacuum switch technology to be connected with an intermediate frequency vacuum switch in parallel, the direct current vacuum circuit breaker is formed, and a pre-charged transfer capacitor and a pre-charged transfer electric reactor in the transfer loop are connected in series; when the vacuum switch is switched off and a transfer input switch is switched on, the intermediate frequency transfer current reversed to the system current in the intermediate frequency vacuum switch is generated, a current null point is formed in the intermediate frequency vacuum switch, and zero passage switching is achieved. According to the intermediate frequency breaking capacity and the redundancy requirement of the intermediate frequency vacuum switch, the transfer loop parameters are designed within a certain frequency range, the high-voltage direct current vacuum circuit breaker in the intermediate voltage stage is composed, the structure is simple, the industrial implementation is convenient, an SF6 gas direct current switch with the greenhouse effect at preset can be replaced, and the series technology can be further developed to the direct current power system field with the higher voltage stage.

Description

technical field [0001] The invention belongs to the field of high-voltage power switches, and is a practical high-voltage DC vacuum circuit breaker technology, which is used for breaking and controlling DC power systems. Background technique [0002] At present, there are two new types of high-parameter switches in the field of high-voltage DC switches: vacuum switches and SF6 switches. The SF6 switch has good insulation performance, but its leaked exhaust gas is harmful to the human body and has a greenhouse effect, and its breaking capacity is limited to a certain extent. The vacuum switch has good breaking performance and strong intermediate frequency breaking capability, but it needs to use current transfer technology, which has the problem of both cost and reliability. The current transfer circuit is essentially an intermediate frequency current generation circuit. Under the premise of ensuring the breaking capacity of the vacuum switch, the selection of the frequency ...

AI Technical Summary

Problems solved by technology

SF6 switch has good insulation performance, but its leaked exhaust gas is harmful to the human body and has a greenhouse effect, and the breaking capacity is limited to a certain extent.

The vacuum switch has good breaking performance and strong intermediate frequency breaking ability, but it needs to use current transfer technology, which has the problem of both cost and reliability.

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