750kV大型变压器局放试验实例

An Example of Partial Discharge Test of 750 kV Large Transformer

局放试验是检测变压器绝缘性能的重要手段之一,对确保电厂稳定送电和电网安全有重要作用,本文介绍了某电厂750kV#2号变压器局放试验要求、试验过程,根据试验过程中出现局放量超标的现象,分析局放量超标的原因,排除各种干扰源并进行试验,最终确为变压器套管绝缘性能不合格导致试验过程出现放电;为大型变压器局放试验提供了一定的经验参考。

Partial discharge test is one of the important means to examine transformer insulation performance,which plays an important role in ensuring stable power transmission of the power plant and power grid safety.This paper introduces the requirements and examination process of partial discharge test for 750 kV#2 transformer in a power plant.According to the phenomenon of excessive partial discharge in the examination process,the causes are analyzed,various interference sources are eliminated and tested.Finally,it is the unqualified insulation performance of transformer bushing that leads to discharge in the examination process.It provides some experience reference for large transformer partial discharge test.