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我局某矿井下主水泵房在起动440KW水泵时,曾发生一次PB_2—6型防爆开关爆炸事故。 1.事故情况 该矿井下6千伏电源是由井上35/6KV10000KVA降压变压器通过母线直接送下井的,井下泵房是单母线分段。当时井上用电负荷不大,但有一组补偿电容器投运;井下已运转三台440KW水泵,其他负苘不大。水泵的操作开关是西安高压开关厂产PB_2—6型高压防爆开关,当起动第四台水泵时,合上开关2秒钟左右开关发生爆炸。开关上盖的18条φ16的紧固螺丝17条螺扣损坏,螺帽脱出,一条螺丝被扭断,上盖厚15mm的防爆法兰扭曲,大盖飞离开关。 2.原因分析 事后检查发现油断路器的可动部分在空气中二相之间有电弧烧熔的痕迹,油面以上的开
Bureau of a mine under the main pump room 440KW pump in the start, there was a PB2-6 explosion-proof switch explosion. 1. Accident The mine 6 kV power supply is downhole 35 / 6KV10000KVA step-down transformer through the bus to send directly downhole, downhole pump room is a single busbar section. At that time, the load on the hill was not large, but a group of compensating capacitors were put into operation. Three 440KW pumps were operated downhole, and the others were not very large. The operating switch of the pump is PB2-6 high-voltage explosion-proof switch manufactured by Xi’an High-voltage Switch Factory. When starting the fourth pump, close the switch and switch for about 2 seconds to explode. 18 screws of 18 φ16 fastening screws on the switch cover are damaged, the screw cap is screwed out, a screw is twisted off, the explosion proof flange with a thickness of 15mm is twisted, and the cover flies away from the switch. 2. Analysis of the reasons after the inspection found that the movable part of the oil circuit breaker in the air between the two phases there are signs of arc burning, oil above the open