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我厂3号主变压器1976年6月投产。投产后值班人员反映,在主变压侧中性点刀闸倒闸操作中,当拉开中性点刀闸时,多次发现较大弧光。后来,我们在现场试验,观察到拉弧30公分,弧光颜色暗红色。 自1976年6月至1979年5月,上、下厂220KV系统联络运行,当下厂3B自高压侧冲击合闸时,曾3次造成上厂中性点接地变压器1号主变(1 B)另序过流保护动作跳闸。厂和省局有关领导对此十分重视,我们也做了些现场试验,终于在79年12月停电查找中,发现3B的C相分接开关错投到Ⅲ档(当时应为Ⅱ档),经倒回Ⅱ档后,消除了安全生产的一大隐患。
I plant on the 3rd main transformer put into operation in June 1976. After commissioning on duty personnel reflect the main transformer side of the neutral point knife switch operation, when opened the neutral point knife gate, the more often found a larger arc. Later, we experimented in the field and observed an arc of 30 cm with an arc of dark red color. From June 1976 to May 1979, the upper and lower plants 220KV system liaison and operation, the current plant 3B from the high-pressure side of the impact switch, had three times on the factory caused by the neutral point grounding transformer No. 1 main transformer (1 B) Another sequence of overcurrent protection action trip. The leaders of the factory and the provincial government attach great importance to this and we have also done some field tests. Finally, in the power blackout search in December 1979, we found that the 3B phase C tap switch was wrongly put into the third gear (at that time it should be the second gear) After the second file back, eliminating a major risk of safety.