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。中性点通过电阻器接地可以把故障电流限制到适当值，提高继电保护的灵敏度作用于跳闸，同时又使故障点仅可能发生局部轻微灼伤，把暂态过电压限制到正常线电压对中性点电压的2.6倍，限制电弧的重燃，防止弧光间隙过电压损坏主设备，同时可有效防止铁磁谐振过电压，从而保证发电机的安全运行。对降低电网过电压、提高电网的安全性、可靠性，具有良好的效果。
Generator neutral grounding with high resistance is widely used in the world to limit the grounding current and prevent the harm of various overvoltages. The neutral point grounding through resistor can limit the fault current to an appropriate value, improve the sensitivity of relay protection to trip, and at the same time, only slight local burns may occur at the fault point, limit the transient overvoltage to 2.6 times of the normal line voltage to the neutral point voltage, limit arc reburning, prevent arc gap overvoltage from damaging the main equipment, and effectively prevent ferromagnetic resonance. Vibration overvoltage ensures the safe operation of generator. It has a good effect on reducing the overvoltage and improving the security and reliability of the power grid.