描述

在電壓互感器單相高壓熔絲熔斷和接地故障時，母線絕緣監(jiān)察表的指示都會發(fā)生變化，如不注意分析，往往會造成誤判斷。但只要檢查三相對地電壓指示情況，將各相對地電壓進(jìn)行分析比較，這2種情況還是容易區(qū)分的。具體的判斷方法為：

（1）單相接地故障時，正常相對地電壓升高，故障相對地電壓降低（完全接地時為0）。

（2）電壓互感器高壓熔絲單相熔斷時，熔斷相對地電壓降低，但一般不為0，還會有感應(yīng)電壓。因單相熔斷時，加在互感器上的一次電壓少了一相，另兩相為正常電壓，其相量差120°，所以會在互感器開口三角兩段出現(xiàn)3倍于正常電壓的零序電壓，此時也可能報出接地信號（絕緣監(jiān)察繼電器整定值一般為30V左右）。

通過以上2種現(xiàn)象的比較分析，一般是不會發(fā)生誤判斷的。

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