Mitsubishi Electric Corporation

Yuta Nakayama

Satoru Yoshida

Tomotaka Yano

Masahiro Arioka

Koji Sano

Kyoichi Otsuka

Taehyun Kim

Tachyun Kim

A vacuum valve includes a fixed side electrode on a fixed side current-carrying shaft and a movable side electrode on a movable side current-carrying shaft. An opening and closing unit is coaxially disposed with the movable side current-carrying shaft, and drives the movable side current-carrying shaft. A chattering suppression structure is coaxially disposed with the fixed side current-carrying shaft on the fixed side of the vacuum valve, and suppresses chattering. The opening and closing unit includes an electromagnetic operating mechanism which drives the movable side current-carrying shaft when energized. A contact pressure spring is coaxially disposed with the electromagnetic operating mechanism, and applies contact pressure between the movable side electrode and the fixed side electrode during contact closing of the vacuum valve. A release spring is coaxially disposed with the electromagnetic operating mechanism, and assists driving force of the electromagnetic operating mechanism during contact opening of the vacuum valve.

Power switchgear

In a tank type vacuum circuit breaker in which each of movable side and fixed side connection terminals of a vacuum interrupter arranged in a main tank and the lower end of each of conductors of a pair of bushings arranged in a standing condition in the main tank are connected by a flexible conductor and a shield for surrounding connection portions is provided, the shield is configured by combining: a main body side shield which is provided on axial both sides of the vacuum interrupter and covers a connection portion of the flexible conductor and the connection terminal; and a bushing side shield which is provided on the lower end side of the conductor and covers a connection portion of the conductor and the flexible conductor.

Tank type vacuum circuit breaker

Case for vacuum circuit breaker

A power switching apparatus includes: a pressure tank having tube-like openings in a shank portion and having an insulating gas sealed therein; a vacuum valve housed in the pressure tank and connected to the pressure tank at one end; bushing conductors penetrating through the openings of the pressure tank and electrically connected to the vacuum valve; and current transformers provided on an outside of the pressure tank and measuring a current flowing through the bushing conductors. Tube-like current transformer installation portions on which to install the current transformers are provided above the openings of the pressure tank and an outside diameter of the openings of the pressure tank is made larger than an outside diameter of the current transformer installation portions.

Growing community of inventors

Chiyoda-ku, Japan

Yuta Nakayama