接触不良对电容式电压互感器介损试验的影响

Influence of Poor Contact on Dielectric Loss Test of Capacitive Voltage Transformer

在测量电容式电压互感器(CVT)的过程中发现介损仪的测量线“Cx”接触不良会对测量结果造成偏大的影响,通过对CVT测量原理图的具体分析,得出由于测量线接触不良而产生一附加电阻Rf,由于Rf的影响使测量结果偏大,运行十几年的变电站设备不同程度的存在老化锈蚀现象,在进行电容型设备介质损耗试验时,接线是否接触良好,特别是测量线“Cx”接触是否良好将直接影响到测量结果。

In the dielectric loss test of CVT, it is found that the measuring result would be influenced by poor contatct of Cx connection. Based on the analysis of the CVT test principle, the additional resistance Rf produced by the poor contact will increase the testing result. It should be paid more attentions to the connection of Cx port during the test, especially to the substations operated for long time.