安装质量不良导致变压器现场局放试验击穿故障分析

现场局部放电试验已成为考核变压器经运输、现场安装或大修后绝缘状况的重要试验之一。在对陕西电网变压器开展的现场局部放电试验普查工作中，发现了数起因安装质量不合格而导致的变压器局部放电量超标事例。本文较详细地介绍了事故出现的经过及其排查方法，出现击穿故障后又用多种方法进行加压并进行了相关的辅助试验，最终找出故障原因。

Analysis of Breakdown Fault Caused by Bad Installation Quality During Partial Discharge Test of Transformer in the Field

The partial discharge test of transformer in the field has become an important experiment in examining the transformers after transportation, field installation or major repair. In general survey for transformer partial discharge test in Shaanxi power grid, several cases of surpassing the set standard of partial discharge caused by unqualified installation has been discovered. The course and inspection measures have been presented in details. After occurrence of breakdown, several methods to increase the voltage and other aided tests have been carried out. Finally the causes leading to failure have been found.