Air China Limited

China Electric Power Research Institute

State Grid Corporation of China

China-Epri Electric Power Engineering Co., Ltd

State Grid Cooperation of China, Co., Ltd.

State Grid Smart Grid Research Institute

Global Energy Interconnection Research Institute Co. Ltd

North China Grid Company Limited

Chong Gao

Jun Yang

Sheng Zhang

Guangfu Tang

Zhiyuan He

Xiang Luo

Huafeng Wang

Kunpeng Zha

Xiaoguang Wei

Jialiang Wen

Jianhui Zhou

Xingang Zhang

Hui Pang

Pengzhi Li

Wei Dong

Yufeng Qiu

Wandi Zhou

Junzheng Cao

Guang Fu Tang

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.

Direct current circuit breaker and its implementation

Dish

Teapot with lid

The present invention provides to a default current testing method of the high voltage direct current converter valve composited by impulse voltage. The technical scheme of the invention composites the symmetrical positive and negative voltage and the impulse into asymmetric positive and negative high voltage, it makes the test valve voltage accurately achieve required peak value at the set time. The test circuit is simple relatively; the high voltage source of the default current test circuit is instead by surge generators. The test method is flexible, safe, and suitable for different DC project converter valves.

Default current test method of impulse voltage mixed high voltage direct current converter valve

The present invention relates to a test equipment of direct current thyristor valve, and particularly relates to a fault current test equipment of direct current thyristor valve. This present invention equipment includes high voltage low current circuit and low voltage high current circuit, said test equipment includes fault current circuit, said fault current circuit includes resonant circuit, said high voltage low current circuit, low voltage high current circuit and fault current circuit are all connected with the thyristor sample Vt respectively. In his present invention, the thyristor sample is first heated through the high voltage circuit and low voltage high current circuit to reach the stable state. And then shut off the switch and carries out the test using the fault current which is produced by the fault current circuit. This prevents the power system from the short-circuit impact. Further more, the peak current and the current duration of the fault current circuit can be adjusted flexibly by changing the voltage of the adding energy circuit.

Fault current test equipment of direct current thyristor valve

Growing community of inventors

Beijing, China

Chong Gao