After the neutral point is grounded through Peterson coil, it can decrease the capacitor current through fault point and the over-voltage caused by the grounding fault, which is advantage for the extinguishments of electric arc.

• 中性点经消弧线圈接地后，有效地减小了流过故障点的电容电流，减小了弧光接地过电压，有利于电弧熄灭。