用脉冲电压谐振法检测干式电抗器匝间绝缘的现场应用

Application of Pulse Voltage Resonance Method to the Detection of Inter-turn Insulation of Dry-type Reactor

近年来甘肃电网中干式电抗器发生匝间短路最终起火燃烧的事故时有发生,由于采取常规试验方法,无法准确诊断干式空心电抗器的内部绝缘状态,为解决这一问题,笔者通过对脉冲电压谐振法的研究,对比匝间短路出现在中部和端部的区别,并将该方法应用到实际检测工作中,发现该方法能有效地检测出电抗器内部匝间短路故障,为今后在全省范围内开展干式电抗器普测工作打下基础。

In recent years,burnt fault due to inter-turn short circuit of dry type reactor often happens in Gansu power grid. The internal insulation condition of the dry core type reactor can not be judged correctly by the conventional test method. In order to solve this problem,through comparing the distinction of interturn short circuit occurred in the middle and terminal part,the pulse voltage resonance method is studied,and is used in the actual detection work. It is found that the method can effectively detect the internal inter-turn short circuit fault of reactor and lays foundation for the survey work of dry type reactor in Gansu Province.