| 摘要 |
PROBLEM TO BE SOLVED: To keep an opening degree of a liquid feeding valve during a closing operation to stabilize an opening operation.SOLUTION: A liquid pressure operating apparatus 4 includes a driving unit 5 for driving a movable electrode 3 of a breaker by supply and discharge of a pressurized liquid, a liquid pressure control unit 11 for controlling the supply and the discharge of the pressurized liquid, a pump unit 18 for generating the pressurized liquid, an accumulator 15 for accumulating the generated pressurized liquid to always supply the liquid to the driving unit 5, and a low pressure tank 17 for recovering the liquid discharged from the driving unit 5. In the liquid pressure control unit 11, a liquid chamber 57 is provided inside a drainage valve 51 of a main operation valve 12, and a liquid chamber 94 communicating with the liquid chamber 57 via a diaphragm aperture 95 is provided inside a liquid feeding valve 52, and an auxiliary piston 93 is provided in the liquid chamber 94. During a closing operation of the breaker, the auxiliary piston 93 slides inside the liquid feeding valve 52 while the liquid moves from the liquid chamber 57 to the liquid chamber 94 via the diaphragm aperture 95, thereby increasing or decreasing the volume of the liquid chamber 94. |
