Research and Development of 160kV Ultra-Fast Mechanical HVDC Circuit Breaker
ZHANG Zu’an1, LI Xiaolin1, CHEN Ming1, HE Junjia2, LI Yan1, XU Shukai1, YUAN Zhao2, LI Yanlin3, CEN Yishun3, ZHAO Xiaobin1
1. State Key Laboratory of HVDC(Electric Power Research Institute, China Southern Power Grid),Guangzhou 510663, Guangdong Province, China; 2. State Key Laboratory of Advanced Electromagnetic Engineering and Technology (Huazhong University of Science and Technology), Wuhan 430074, Hubei Province, China; 3. Siyuan Electric Co., Ltd., Minhang District, Shanghai 201108, China
Abstract: Aiming at actual demand of HVDC circuit breaker in Nan’ao ±160kV multi-terminal VSC-HVDC project, a new type of mechanical HVDC circuit breaker topology and scheme of a 160kV HVDC mechanical circuit breaker were put forward. Key technologies such as ultra-fast electromagnetic repulsion actuator and voltage-grading of multiple breaks in series were studied through simulation. Then a prototype of 160kV ultra-fast mechanical HVDC circuit breaker was developed and a test circuit using generator source to provide AC current to simulate DC fault current breaking was proposed. Finally, positive and negative high current breaking tests were performed. Experimental results illustrate that the mechanical HVDC circuit breaker successfully interrupts 9.2kA forward current with peak value of transient recovery voltage (TRV) 272kV and breaking time 3.9ms. It also successfully interrupts 9.2kA reverse current with TRV peak value 262kV and breaking time 4.6ms.
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