变压器低压侧馈电线路故障可能会导致变压器严重损坏,造成矿区大面积停电,针对一起因线路遭雷击引起的单相闪络故障发展为相间故障,致使110 kV变压器绝缘损坏事件,利用故障录波、调度综合自动化后台SCADA及SOE提供的信息,详细分析了整个事故的发展过程及变压器的抗短路能力。根据国际标准和国家标准中的相关规定,查出了变压器损坏的原因。根据事故原因提出了相关电气设备在检修维护中应采取的防范措施及检测识别变压器是否损坏的方法,这些措施及方法的实施可有效提高煤矿供电的安全性。%The feed circuit fault at the low voltage side of the transformer could cause a serious damage to the transformer and cause a power shut down to a large area of the mining area.An interphase fault occurred by the single phase flashover fault due to a line damaged by thunderstrike had made a serous accident of the insulation damage to a 110 kV transformer.The fault recorded wave,the dispatching and comprehensive automatic background SCADA and the information provided by SOE were applied to analyze the development process of the accident and anti short circuit capacity of the transformer.Based on the related stipulations of the ISO standard and the national standard,the failure cause of the transformer was found.According to the fault causes,the prevention measures and the method to test and identify the transformer damaged or not were provided to the repair and maintenance of the related electric equipment.The implementation of those measures and method could effectively improve the safety of the mine electric power supply.
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