| 摘要 |
PROBLEM TO BE SOLVED: To provide a pressure diagnostic device of a vacuum circuit breaker, which diagnoses the pressure integrity of the vacuum circuit breaker easily and safely, without switching off all feeders of a switching device including the circuit breaker of an inspection object. SOLUTION: The pressure diagnostic device 100 of a vacuum circuit breaker is provided with: a vacuum container 11 which has built in a pair of contacts 19A, 16A in free contact and separation and a metal part 17 electrically insulated from the contacts; and conductors 16, 19, 17 which penetrate from the inside to the outside of the vacuum container 11 and are connected respectively to the pair of contacts and the metal part. The pressure diagnostic device is constituted of: a DC voltage generating device 106 which is connected electrically to the conductor 17 of the metal part and impresses the metal part 17; and a means 108 of measuring potential fluctuations of the metal part. COPYRIGHT: (C)2011,JPO&INPIT
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