| 摘要 |
PROBLEM TO BE SOLVED: To make it possible to discharge a residual charge in a commutating capacitor in the pull-out state of a pull-out type circuit breaker equipped with a commutating capacitor. SOLUTION: Within a supporting frame 5 supporting a pull-out type DC circuit breaker 3 in a horizontally pull-out manner, a discharge circuit breaker 12 is provided in a switching manner from the front face of the breaker, and both ends of the commutating capacitor is made short-circuited by closing the circuit. In a state in which the DC breaker 3 is pulled out to the test position, the discharge circuit breaker 12 is closed, the commutating switch 10 is turned on, and the residual electric charge of the commutating capacitor is discharged. |
