一起变压器局部放电交接试验中绝缘缺陷的发现及分析

Discovery of Insulation Defect in Hand-over Test of Partial Discharge in Transformer and Its Analysis

大型电力变压器在投运前必须进行局部放电交接试验,介绍了一起220 k V电力变压器局部放电交接试验中发现的B相中压局部放电量超标现象,通过对放电图谱特征的分析,结合技术定位和变压器历史信息,判断出局部放电原因和位置,经过吊罩检查找到了放电位置并对缺陷进行了消除。

The hand- over test of partial discharge should be done for large- scale power transformers before being put into operation. The phenomenon about excessive partial discharge found in phase B in hand- over test for a 220 k V power transformer is introduced. The discharge waveform is analyzed combined with technique location and historical information of the transformer. After the examination of the transformer,the insulation defect of partial discharge is located and eliminated.