| 摘要 |
A gas insulated metal-clad electrical power equipment has a cylindrical insulating bushing for supporting an electrical conductor. The bushing is filled with the insulating gas therein and air-tightly fixed to a grounded metal compartment wall member of the equipment in such a way that the outer surface of the conductor directly faces the inner circumferential surface of a through hole formed in the wall member with a distance g therebetween. When the axial length l of the inner cylindrical space of the bushing is determined as l>/=g/4 and further the difference in diameter between the wall through hole phi 1 and the inner cylindrical space phi 2 of the bushing is determined as phi 2- phi 1>/=4 mm, it is possible to effectively prevent dielectric breakdown along the surface of the bushing. Owing to the above arrangement, it is possible to effectively reduce the size, space, weight, cost, etc. of the bushing, as compared with conventional ones.
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