发电机在运行中，发生单相接地是最常见的故障，故障点出现电弧接地时会进一步扩大定子绕组绝缘损害甚至导致铁芯灼伤烧结，如不及时发现并快速切除，故障将发展成为相间或匝间短路。
In the operation of generators, single-phase grounding is the most common fault. When arc grounding occurs at fault points, the insulation damage of stator windings will be further expanded and even lead to iron core burning and sintering. If the fault is not found in time and quickly removed, it will develop into inter-phase or inter-turn short circuit.
基于上述原因，国际广泛采用发电机中性点高阻接地，以限制接地电流，防止各种过电压的危害，取得了良好的运行经验。
For the above reasons, high resistance grounding of generator neutral point is widely used in the world to limit grounding current and prevent the harm of various overvoltages. Good operation experience has been obtained.