| 摘要 |
984,999. Gas blast switches. CANADIAN WESTINGHOUSE CO. April 25, 1963 [May 7, 1962], No. 16265/63. Heading H2B. In a three-phase, multiple-break, compressed air operated, gas blast interrupter each set of series-connected contacts 24, 25 are arranged in a part 12 of a metallic housing 4 at line potential which part is sealed by a bellows 35 and contains SF 6 under pressure. To open the contacts a valve 15 admits high-pressure compressed air from a reservoir 14 in another part of housing 4 to the back of a piston 29, the space 23 ahead of the piston being open to atmosphere at 32. The piston 29 moves to open the contacts and create an arc between an arcing electrode 27 and an arc resistant surface 24a of contact 24. Simultaneously the compressed air acts on a second piston 38 driving it to the left to compress the SF 6 and drive it, through apertures 41, across the arc. The contacts are reclosed by a spring 46 when the rear of piston 29 is vented to atmosphere by the valve 15. The compressed SF 6 is circulated through a filter (Fig. 6, not shown). Capacitors 50 ensure equal division of the voltage between the multiple breaks. |
