消弧线圈运行抽头的选择

Selection of operational tap for arc suppresion coils

中性点经消弧线圈接地可以保证电力系统供电可靠性,消弧线圈的运行和调整基于两点:一是消弧线圈的电感电流补偿电网接地电容电流,限制接地故障电流的破坏作用,使残流的接地电弧易于熄灭;二是限制中性点位移电压,防止三相对地电压偏移较大而危及电力设备的绝缘。研究消弧线圈的运行和调整,充分发挥消弧线圈作用并提高其动作成功率,对于改善中性点经消弧线圈接地的电力系统运行,很有实际意义。

Grounding via arc suppression coils at neutral point may ensure reliable power supply from the power supply system,and the operation and adjustment of arc suppression coils are based up two points:1)the induction current of arc suppression coils compensates the electric network grounding capacitance current,limlits the destructive effect of grounding failure current,and makes the grounding arc of residual current easy to be eliminated;2)limits the displacement voltage of neutral point,and prevents larger 3-phase ground voltage drift from endangering the insulation of electric power equipment. It is therefore of great significance to study the operation and adjustment of arc suppression coils,bring into full play the role of arc suppresion coils and improve its operational success rate for the improvement of the operation of the electric power system grounded via arc suppresion coils at neutral point.