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某厂一个二级变电站,担负着居民生活供电。一天下午,该变电站变压器低压侧接线柱中的C相突然着火,幸及时发现和处理,才未造成更大的损失。 事故检查分析说明,该变压器低压侧与铝排母线相连至户内配电柜,铝排用铜螺母紧固在接线柱上。拆下接线柱后,发现该螺栓上压紧螺母位置处的螺纹已锈秃,无法压紧铝排。事故原因为:铜螺栓与铝排在空气中氧化,生成了一层导电性较差的氧化层,在
A second-level substation plant, responsible for residential life power supply. One afternoon, the substation transformer C low voltage terminal suddenly caught fire, fortunately found and dealt with in time, did not cause greater losses. Accident analysis shows that the low voltage side of the transformer is connected with the aluminum busbar to the indoor distribution cabinet, and the aluminum busbar is fastened with a copper nut on the terminal. After removing the terminal, it was found that the thread at the position of the compression nut on the bolt was rust-bald and unable to compress the aluminum row. The reason for the accident is that the copper bolts and the aluminum row are oxidized in the air and a layer of poorly conductive oxide layer is formed,