| 摘要 |
<p>The problems such as the variations of heat-dissipation and cutoff performance between the phases, the production yield, securement of gas-tightness, standardization of bushings, limitation of production efficiency are solved. An insulating frame supporting the vacuum circuit breaker of a gas-insulated switchgear is an insulating tube. An opening is so provided as to penetrate vertically through the insulating tube, near a movable part of a vacuum valve. The main circuit parts of an isolator with grounding switches are arranged in the upper or lower portion of the insulating tube of each phase in such a way that the positional relation with the vacuum valve is the same. Discrete three-phase insulating spacers provided on the top of a tank are so arranged as to shift sideways, backward, and forward, with the bushing of the second phase centered. The bushings on the bottom of the tank are long enough to provide a current transformer outside the tank.</p> |
