VACUUM DEGREE CONFIRMATION DEVICE AND VACUUM DEGREE CONFIRMATION METHOD FOR VACUUM CIRCUIT BREAKER

摘要

PROBLEM TO BE SOLVED: To provide a vacuum degree confirmation device and method capable of accurately confirming vacuum degree reduction of a vacuum valve regardless of a change in an installation environment of a vacuum circuit breaker by performing attachment/detachment and measurement of the vacuum degree confirmation device in a short time and safely when inspecting the vacuum circuit breaker.;SOLUTION: A vacuum degree confirmation device comprises: a vacuum valve accommodated in a sealed container and including a movable contact and a stationary contact; a contact opening/closing operation mechanism for performing opening/closing operations on the movable contact and the stationary contact; and a load measuring device or a torque measuring device for measuring a load consisting of a total of a repulsive force of an opening spring for energizing the movable contact in a direction separated from the stationary contact and a self-closing force of the vacuum valve. The load measuring device or the torque measuring device is attached to the contact opening/closing operation mechanism in a freely removable manner, records and stores an atmospheric pressure and an initial measurement load in the atmospheric pressure when a vacuum circuit breaker is completely manufactured. When inspecting the vacuum circuit breaker, an inspection-time measurement load at the time of inspection is compared and collated with a correction load of the initial measurement load that is corrected in accordance with an atmospheric pressure at the time of inspection, thereby confirming a vacuum degree of the vacuum valve at the time of inspection.;SELECTED DRAWING: Figure 1;COPYRIGHT: (C)2018,JPO&INPIT