Tank type gas circuit breaker

DETAILED DESCRIPTION An object of the invention is to provide a tank type gas circuit breaker for a three-phase alternating current which is capable of adjusting the interruption timing for the respective phases before the interrupter parts are received in the interrupter tanks and which has a simple structure including a little parts and high reliability.
According to the present invention, there is provided a tank type gas circuit breaker for a three-phase alternating current, comprising: three hollow members spaced in parallel with each other; a single stationary side end plate air-tightly fixed to first ends of the three hollow members; a single mechanism side end plate fixed to second ends of the three hollow members; three stationary contacts each supported to the stationary side end plate and extending in the three hollow members; three movable contacts each supported to the mechanism side end plate and extending in the three hollow members; insulated rods extending in the three hollow members while passing through the mechanism side end plate for interrupting contacts between the movable contacts and the stationary contacts; an operational rotary shaft mechanism disposed adjacent to the mechanism side end plate and connected to the insulated rods for driving each of the insulated rods; an actuator for driving the operational rotary shaft mechanism; two bushing porcelain insulators located on a top surface of each of the hollow members; current transformers arranged in lower sides of the bushing porcelain insulators; conductors disposed within the bushing porcelain insulators and connected to the movable and stationary contacts, and arc-extinction gas filled in the hollow members.
Preferably, the circuit breaker is supported at the two end plates to a base.
Preferably, the bushing porcelain insulators are obliquely provided in air-insulating distance relation with each other.
It is preferable that the operational rotary shaft mechanism is received in a connection tank fixed to the mechanism side end plate, and a sealing member is disposed at a part where a rotary shaft of the operational rotary shaft mechanism passes through the connecting tank