| 摘要 |
PURPOSE:To apply a voltage when the gas pressure has exceeded a prescribed value to start a gas-insulated electrical apparatus thereby to maintain the container inner pressure at constant value at normal time, by providing a heater and a device, which controls the cooling capacity of a cooler in accordance with the normal operation load, inside or outside of a container for heating the inside of the container at starting the operation. CONSTITUTION:A container 3 is provided at its bottom with a heater 14a constituted by an electric resistance means. A switch 15 is actuated through a controller 17 by a pressure sensor 18 inside the container. A cooling liquid 6 is sprayed on a winding 1 and a core 3 by means of a pump 19. A cooler 4a has cold-air fans 20 and a mixed gas blower 21 and is controlled by the controller 17. At starting, a mixed gas 5 and the liquid 6 are preheated by a heater 14a. The fact that the gas pressure has exceeded a prescribed value is sensed by the pressure sensor 18, and a voltage is applied to start. After the start, the rise in pressure due to the heat generated by the winding and the core is sensed by the sensor 18, and the switch 15 is actuated through the controller 17. When the load fluctuates, the fans 20 and the blower 21 are controlled to vary the cooling capacity of the cooler 4a. |
