换流变阀侧套管末屏二次电压异常诊断与分析

Diagnosis and Analysis of Abnormal Secondary Voltage at End Shield of Valve Side Bushing of Converter Transformer

本文作者介绍了一起±800kV换流站200kV换流变阀侧套管末屏二次电压异常升高的情况,通过分析阀侧套管内部结构,确定了引起该现象的原因,并通过试验对判断结果进行了验证,提出了基于阀侧套管末屏二次电压监测的套管主绝缘故障诊断方法。

This article introduces an abnormal increase in secondary voltage at the end shield of valve bushing of a 200kV converter transformer in a±800kV converter station.By analyzing the internal structure of the valve bushing,the cause of this phenomenon is determined.And the judgment results are verified through experiments.The fault diagnosis method for the main insulation of the bushing based on monitoring the secondary voltage at the end shield of valve side bushing is proposed.