摘要
针对一起水内冷发电机定子绕组直流耐压试验过程中泄漏电流过大的问题,分析了泄漏电流过大的原因,提出一套由易到难、逐步诊断的实用方法。通过小容量直流高压发生器对定子绕组施加电压,然后测量汇水管的泄漏电流,对缺陷部位初步定位,再利用红外热成像仪对缺陷部位准确定位,最终成功诊断出泄漏电流过大的缺陷部位是汽轮机侧上层第37号绝缘引水管。更换绝缘引水管后,发电机定子绕组泄漏电流和直流耐压试验符合标准。该诊断方法避免了多次对绕组施加高电压和盲目拆卸绕组,诊断的准确性及效率均较高。
In allusion to the excessive leakage current in DC withstand voltage test of water-cooled generator, this paper analyzed the causes of excessive leakage current, puting forward a set of practical methods from easy to difficult to diagnose step by step. The stator winding was applied voltage by a small capacity direct current high voltage instrument, then the leakage current of the sink pipe was measured, and the defect position was preliminarily located, and the defect position was accurately located by the infrared thermal imager. Finally, it was successfully diagnosed that the high leakage current was in the upper layer of steam turbine No.37 insulated pipe. After replacing the insulated pipe, the generator stator winding leakage current and DC withstand voltage test were passed. The diagnostic method can avoid the application of high voltage for many times and blind disassembly of windings, and the accuracy and efficiency of diagnosis are higher.
作者
李浩良
潘剑南
LI Haoliang;PAN Jiannan(Guangzhou Yueneng Power Technology Development Co.,Ltd.,Guangzhou 510075,China)
出处
《大电机技术》
2020年第4期52-57,共6页
Large Electric Machine and Hydraulic Turbine
关键词
水内冷发电机
泄漏电流
绝缘引水管
故障诊断
直流耐压试验
water-cooled generator
leakage current
insulated water pipe
fault diagnosis
DC withstand voltage test
