Hybrid circuit breaker possessing bridge type induction transfer structure and usage method thereof

Abstract

The invention provides a hybrid circuit breaker possessing a bridge type induction transfer structure and a usage method thereof. The circuit breaker comprises a main current circuit, an overvoltage limiting circuit and a transfer current circuit. The main current circuit, the overvoltage limiting circuit and the transfer current circuit are connected in parallel. An inductive transfer circuit of the transfer current circuit comprises an inductive transfer inductor, an inductive transfer capacitor and an inductive transfer branch power semiconductor device which are connected in series. The transfer current circuit also comprises a bridge circuit. The bridge circuit comprises a main loop inductor. The main loop inductor and the inductive transfer inductor are coupled so as to form a mutual inductor. In the invention, rapid current disconnection can be realized, and a control size and manufacturing cost of the circuit breaker can be effectively reduced. The inductive transfer circuit is used to realize rapid current transfer. A main loop capacitor does not need precharging. Isolation of a secondary charging circuit and a main loop is realized, a transfer speed is fast and disconnection reliability is high.

Description

technical field [0001] The invention belongs to the technical field of electrical equipment, and in particular relates to a transfer current circuit with a bridge-type inductive transfer structure and a use method thereof. Background technique [0002] The hybrid circuit breaker composed of high-speed mechanical switches and power semiconductor devices has the advantages of large current capacity, fast shutdown speed, and strong current limiting capability, and has become a research hotspot in the field of large-capacity system breaking. Compared with other hybrid solutions, the hybrid DC circuit breaker scheme using power semiconductor devices with full control function to break current has the advantages of faster breaking speed and more favorable breaking rated current. However, when a fully-controlled power semiconductor device is used to break the current, the current transfer circuit usually requires the fully-controlled power semiconductor device to shut off the curre...

AI Technical Summary

Problems solved by technology

However, when using a fully-controlled power semiconductor device to break the current, its current transfer circuit usually requires a fully-controlled power semiconductor device to shut off the current, which restricts its promotion and application due to the high complexity and cost of control.

[0003] The capacitor charging circuit in the traditional transfer current circuit is directly connected to the main circuit without isolation, the charging power supply and the main circuit will interfere during the disconnection process, and the withstand voltage requirements for the main circuit charging power supply are very high, and the disconnection is unreliable

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