变电所中性点位移电压偏高分析

Analysis of higher substation neutral voltage shift

针对变电所消弧线圈接地系统在正常运行情况下中性点位移电压长时间偏高现象,进行了分析。定量地估算了系统实际不对称电压值,提出通过降低不对称电压U0,增大消弧线圈的脱谐率v和增大电网的阻尼率d等方法可降低消弧线圈接地系统中性点位移电压,从而保证消弧线圈的正常工作。

The abnormal phenomenon of long time higher neutral voltage shift in a substation is analyzed,which is grounded through arc suppression coil. The actual asymmetrical voltage is quantita-tively estimated. Three methods to lower the neutral voltage shift are presented,lowering the asym-metrical voltage U0,increasing resonant deduction rate v and increasing the damping ratio d,which ensure the normal operation of arc suppression coil.