| 摘要 |
A vacuum circuit breaker (1) has: a grounding tank (2); vacuum interrupters (3, 4); a linking mechanism (5) for opening and closing the vacuum interrupters (3, 4); and a linking mechanism case (19) for accommodating the linking mechanism (5). A support porcelain tube (21) for supporting the linking mechanism case (19) is provided on the inner peripheral surface of the grounding tank (2), and an insulated operating rod (20) for operating the linking mechanism (5) is provided so as to pass through the inside of the support porcelain tube (21) and a side part of the grounding tank (2). An operating chamber (23) is provided in the passage for the insulated operating rod (20) in the grounding tank (2), and a conversion mechanism (24) for driving the insulated operating rod (20) is accommodated within the operating chamber (23). A space (within the linking mechanism case (19), within the support porcelain tube (21), and the like) linked with the inside peripheral part of bellows (13, 13) for the vacuum interrupters (3, 4) is filled with insulating gas at 0.3 MPa or less, and other spaces are filled with high pressure insulating gas. |
