| 摘要 |
PURPOSE:To elevate the dielectric strength of lower winding end part of oil-filled electric induction apparatus where the tension of electric field is high by a method wherein at the lower insulator being in contact with shielding ring at least the length of face facing the iron core leg is made to be shortened than the end face of shielding ring. CONSTITUTION:A shielding ring 6 arranged under a series winding 3 is coated with an insulator 14 and is disposed on a shielded electrode 20, while its two bottom corner parts form curved faces. The end parts of an insulating stand 16 being in contact with the shielding ring 6 are made to be shortened than the end parts of shielding ring 6, and the stand is made to have the same length with a plane surface of ring 6 not to grow gaps between the shielding ring 6 and the insulating stand 16. Then an outer L formed barrier 9', an insulating stand 17 and an inner L formed barrier 10 are arranged, and the end part of insulating stand 17 and the end part of outer barrier 9' are put on a same line with the end part of insulating stand 16. By this way, when oil is filled in the apparatus, the stagnant place does not occur and the dielectric strength of lower winding end part where the electric field is high can be elevated. |
