Patent ID: 9136674
Filing Date: 2015-09-15
Classification: H01H,H02B

Abstract:
1. A dead tank vacuum circuit breaker, comprising: an electrically grounded pressure tank having a plurality of opening portions, in which an insulating gas is sealed; bushings connected to the pressure tank at one ends and hermetically sealed at the other ends by terminal conductors; a vacuum valve provided to the pressure tank and housing an immovable conductor and a movable conductor allowed to come close to and move apart from the immovable conductor; lead conductors provided concentrically in an inner space of the bushings and connected to the terminal conductors; connection conductors connecting the lead conductors and the respective immovable conductor and movable conductor; and opening and closing means for driving the movable conductor via an insulating rod connected to the movable conductor, the dead tank vacuum circuit breaker being characterized in that: an insulating support member supporting an immovable-side end of the vacuum valve is attached to the pressure tank in a vicinity of the immovable-side opening portion of the pressure tank in an attachable and detachable manner; and the lead conductors and the connection conductors are slidable in an axial direction of the lead conductors in the inner space of the bushings during a state when the bushings are connected to the pressure tank, and a connection portion slidable in the axial direction is provided to at least one point in the respective lead conductors.