Bridge type bidirectional non-arc direct-current circuit breaker

Abstract

The invention discloses a bridge type bidirectional non-arc direct-current circuit breaker. The bridge type bidirectional non-arc direct-current circuit breaker comprises a main current circuit, a transfer current circuit and an energy consumption circuit, wherein the main current circuit is used for enabling current under a normal working state to pass; the energy consumption circuit is used for consuming energy of short-circuit failure current when the short-circuit failure current reaches a threshold value and the transfer current circuit is switched off; the transfer current circuit adopts a bridge type circuit and a breakover control for increasing the withstand voltage level and prolonging the service life of the circuit, and is used for realizing transfer of the short-circuit failure current from the main current circuit when the short-circuit failure current occurs; meanwhile, the transfer current circuit adopts one group of unidirectional power semiconductors having switch-off ability, thereby realizing bidirectional breaking of current; compared with the prior art, at least 50 percent of the unidirectional power semiconductors having the switch-off ability are saved, and the volume and the manufacturing cost of the bridge type bidirectional non-arc direct-current circuit breaker are effectively reduced.

Description

technical field [0001] The disclosure belongs to the field of medium and high voltage circuit breakers, and in particular relates to a bridge-type bidirectional arc-free DC circuit breaker. Background technique [0002] The DC circuit breaker is an important part of the power grid. Its main task is to quickly remove the faulty part from the power grid when the system fails, so as to ensure the normal operation of the non-faulty part. The main difficulty of DC breaking compared with AC breaking is that DC current does not have a zero-crossing point like AC current, and it is more difficult to extinguish the arc; the energy absorbed by the DC circuit breaker is very large; the overvoltage is relatively high, which is unfavorable to the line and equipment. influences. Compared with other solutions, the scheme of using power semiconductor devices with full control function to break the current has the advantages of faster breaking speed and more conducive to breaking the rated ...

AI Technical Summary

Problems solved by technology

However, bidirectional full-control power semiconductor devices are usually required to turn off the current, and the control complexity and cost are relatively high, which restricts its promotion and application.

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