摘要 : A high-speed vacuum circuit breaker which forces the fault current to zero was investigated. The test circuit breaker consisted of a vacuum interrupter and a high-frequency current source. A vacuum interrupter with an axial magnet... 展开 A high-speed vacuum circuit breaker which forces the fault current to zero was investigated. The test circuit breaker consisted of a vacuum interrupter and a high-frequency current source. A vacuum interrupter with an axial magnetic field electrode and a disk-shaped electrode was tested. The arcing period of the high-speed vacuum circuit breaker is much shorter than that of a conventional circuit breaker. The arc behavior of the test electrodes immediately after the contact separation was observed by a high-speed video recorder. The relation between the current waveform just before the current zero point and the interruption ability was investigated experimentally by varying the high-frequency current source. The results demonstrate the interruption ability and the arc behavior of the high-speed vacuum circuit breaker. Effective current interruption is made possible by a low current period just before the current zero point, even though the arcing time is short and the arc is concentrated. 收起