单相接地电流不大时，电流流过零值时的电弧将自行熄灭，故障消失；单相接地电流大于30安时，产生稳定电弧，将形成持续性弧光接地，将会损坏设备并导致两相甚至三相短路；

When the single-phase grounding current is small, the arc will extinguish itself and the fault will disappear when the current flows through zero value; when the single-phase grounding current is greater than 30 amperes, a stable arc will be generated, which will form a continuous arc grounding, which will damage the equipment and lead to two-phase or even three-phase short circuit.

当接地电流大于10安小于30安时，有可能产生一种不稳定的间歇性电弧，随之将出现弧光过电压，幅值可达2．5至3倍相电压，足以危及整个电网的绝缘。

When the grounding current is greater than 10 amperes and less than 30 amperes, an unstable intermittent arc may occur, which will lead to arc overvoltage with an amplitude of 2.5 to 3 times the phase voltage, which is enough to endanger the insulation of the whole power grid.

在变压器的中性点装设消弧线圈形成的电感电流与电容电流相补偿，将使接地电流限止，甚至近于零，从而消除了接地处的电弧以及由它产生和危害。