| 摘要 |
PURPOSE:To prevent the production of air bubbles in an insulating oil filled in a bushing pocket, by a method wherein the oil is filled, with the flow velocity thereof greatly reduced, so as to creep along a mounting seat and the wall surface of an insulating shield tube. CONSTITUTION:As an exhaust valve 18 and an oiling valve 15 are opened, an insulating oil flows into a bushing pocket 8 from a conservator 12 through an oil duct 16 and an oiling pipe 14. At the same time, the air inside the bushing pocket 8 is naturally discharged from the exhaust valve 18. The outflow of the insulating oil is suppressed by a narrow path constituted by the oiling pipe 14. In addition, the outlet side of the narrow path is opened in a trumpet-like shape. Therefore, the insulating oil is gradually decreased in flow velocity by flowing along the trumpet-like part, so that the oil flows while hardly producing air bubbles. The insulating oil flowing into an insulating shield tube 5 gradually increases in amount to fill the bushing pocket 8. |
