Direct current circuit breaker and its implementation
AssigneeState Grid Cooperation of China
InventorsGuangfu Tang, Chong Gao, Xiang Luo, Xiaoguang Wei, Yufeng Qiu, Junzheng Cao
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Abstract
The present invention provides a direct current circuit breaker and its implementation method, which includes a cutout circuit, a commutation circuit and a energy absorption circuit connected in parallel. Through using power semiconductor switch module to cut off the current, it will have a quickly action, without generating electric arc, while the modular construction also reduces the consistency requirements of the power electronic component.
Claims11
A direct current circuit breaker, said breaker includes a cutout circuit, a commutation circuit and an energy absorption circuit connected in parallel, is characterized that, said cutout circuit includes a cutout inductance and a cutout unit connected in series;
- said commutation circuit includes a commutation inductance, a commutation unit and a mechanical switch connected in series, wherein a full bridge structure converter includes a capacitor and a H bridge structure power semiconductor switch module;
- said H bridge structure power semiconductor switch module includes four power semiconductor switch modules;
- each two are in series together and constitute a branch, two branches are parallel, and respectively, extract an intermediate point of the two branches as an input end and output end;
- and said capacitor connects to the power semiconductor switch module branch.
An application method of a direct current circuit breaker, is characterized that, said method includes the steps of:
- (a) controlling, by a control circuit, a converter of a commutation unit and a mechanical switch;
- (b) testing, by the control circuit, a current value of every path, when the current value exceeds a first current limit, triggering, by the control circuit, the converter of a cutout unit if the signal to lock the converter of the commutation unit is received, then the converter of the commutation unit is locked;
- the capacitors of a commutation inductance and the commutation unit form the oscillation to move the current into the cutout unit;
- and
- (c) turning off said mechanical switch.
Dependencies are inferred from the claim text.