| 摘要 |
PURPOSE:To curtail the size of insulator by providing a cooling device and supply/exhaust means for insulation fluid and enheighten a pressure difference between metallic internal sealing case and external pressure case at the side of internal sealing case in the range of 0-2kg/cm<2> under the operating condition of induction device. CONSTITUTION:A metallic internal sealing case 5 accommodates a body 1 of electromagnetic induction apparatus including an iron core 2 and a winding 3 and SF6 or insulation fluid 4 such as coolant, etc. which is compressed in the operating temperature range. An external pressure case 6 accommodates a case 5 and auxiliary pressurizing fluid 7 such as nitrogen gas, air, etc. A circulation piping 8 is provided through the case 6 with air-tight characteristic and is connected to the case 5 and cooling device 9. A branching pipe 11, a compressor 12 and a reservation tank 13 form a supply/exhaust means 10 of fluid 4, while a branching pipe 16 and a compressor 17 form a supply/exhaust means 15. The maximum output of fluid 4 is assumed as P1, while the maximum output of fluid 7 as P2, and the pressure supplied is controlled, satisfying the condition of P1 P2 or P1-P2<2kg/cm<2>. Thereby, size can be reduced by curtailing insulation resistance. |
