摘要
针对一起110kV油浸式电力变压器雷电全波时电流波形出现异常的事故,采用更换示伤电阻、试验回路及支撑电阻等调试手段,并结合油中乙炔含量检测分析,找出故障主要原因是支撑电阻内部击穿。更换支撑电阻后重新复试,电流波形正常。
For a 110 kV oil immersed power transformer,the abnormal current waveform occurs when there is the whole wave of lightning.The test means of changing the resistance of the indication,the test circuit and the support resistance are adopted.Combined with the analysis of acetylene content in oil,it is found that the main cause of the fault is the internal breakdown of the support resistance.After replacing the support resistance and reexamining,the current waveform is normal.
引文
[1]GB 1094.3—2003电力变压器第3部分绝缘水平、绝缘试验和外绝缘空气间隙[S].
[2]GB/T 16927.1—2011高电压试验技术第1部分一般定义及试验要求[S].
[3]GB/T 1094.4—2005电力变压器第4部分电力变压器和电抗器的雷电冲击和操作冲击试验导则[S].