| 摘要 |
PURPOSE:To increase the withstanding voltage of insulating oil further, and the reduce size by applying pressure to insulating oil in an electrical apparatus tank. CONSTITUTION:An electrical apparatus tank 1, which houses a coil and a core 2 for a transformer and is filled with insulating oil 5, has a variable capacity oil housing vessel 4 communicated with the inside of the tank 1 by a communication pipe 3. With the variable capacity oil housing vessel 4, capacity thereof varies with the expansion and contraction of insulating oil 5 in the tank 1 as a rubber bag, and it can buffer the expansion and contraction of insulating oil while it has a pressure device 10 applying pressure to the variable capacity oil housing vessel 4 from the outside. The pressure device 10 consists of a sealed vessel 6 surrounding the variable capacity oil housing vessel 4, a fluid supply pipe, which is communicated with the sealed vessel 6 and supplies the vessel with a pressure fluid, a pressure regulator 8 regulating the pressure of the fluid fed to the sealed vessel 6 and a high-pressure fluid source 9 housing a high-pressure fluid. Nitrogen N2 gas can be used as the high-pressure fluid. |
