| 摘要 |
PROBLEM TO BE SOLVED: To provide a direct current circuit breaker capable of improving a breaking property by restraining the arc energy generated during the time of releasing a saturable reactor from saturated state to the break. SOLUTION: The direct current circuit breaker comprises a saturable reactor 10 and a vacuum circuit breaker 1 serially connected to a direct current circuit, and a commutation circuit composed of a capacitor 4 and a commutation switch 5 connected in parallel with a serial circuit of the saturable reactor 10 and the vacuum circuit breaker 1. When the vacuum circuit breaker 1 is cut of, a commutation current from the commutation circuit is superposed on the current of the direct current circuit, and when the current is below the rated current and reduced into a range of 75% to 10% of the rated current, the saturable reactor is set so as to get into non-saturated state from a state of magnetic saturation. COPYRIGHT: (C)2005,JPO&NCIPI
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