描述
在电压互感器单相高压熔丝熔断和接地故障时,母线绝缘监察表的指示都会发生变化,如不注意分析,往往会造成误判断。但只要检查三相对地电压指示情况,将各相对地电压进行分析比较,这2种情况还是容易区分的。具体的判断方法为:
(1)单相接地故障时,正常相对地电压升高,故障相对地电压降低(完全接地时为0)。
(2)电压互感器高压熔丝单相熔断时,熔断相对地电压降低,但一般不为0,还会有感应电压。因单相熔断时,加在互感器上的一次电压少了一相,另两相为正常电压,其相量差120°,所以会在互感器开口三角两段出现3倍于正常电压的零序电压,此时也可能报出接地信号(绝缘监察继电器整定值一般为30V左右)。
通过以上2种现象的比较分析,一般是不会发生误判断的。
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