电能表中性点虚接对电压互感器二次压降的影响分析

The Influences and Analyses about PT Secondary Voltage Drop Caused by Energy Meter's Neutral Point Virtual Connection

基于对称分量法,对电能表中性点虚接后的电压互感器二次压降进行了分析,得出了正确接线前后的计量误差变化量。并结合现场的电压互感器二次压降测试结果,说明了电能表中性点虚接对二次压降有较大的影响。

Based on the method of syrmnetrical component decomposing, this paper makes theoretical analyses on secondary Voltage drop of voltage transformer under the condition of energy meter＇ s neutral point virtual connection. The variation of metering error between proper and improper statue is obtained. The on-site test results indicate that energy meter＇s neutral point virtual connection has a great effect on PT secondary voltage drop.