一起电压互感器现场试验tanδ值为负的分析及解决方法

Solution to Negative tan δ Value Problem in Field Test of a Transformer Substation

针对某变电站现场预试中出现的tanδ为负值的情况进行了理论分析,并提出了一种切实可行的解决办法——微电流补偿法,解决了由电场干扰造成tanδ值为负的问题,实践证明该办法简单可靠。

To solve the problem of negative tanδ value in field test of some transformer substation, this paper analyzes this phenomenon and gives a feasible resolution-microcurrent compensation method to revolve the negative tanδ due to the interference of electric field. This method is verified simple and reliable.