中性点采用电阻接地方式的目的就是给故障点注入阻性电流，其电阻分量电流可以把故障电流限制得适度，提高继电保护灵敏度，把暂态过电压限制到正常相对中性点电压的2.6倍，防止弧光过电压损坏主设备，同时对铁磁谐振过电压有显著作用。
The purpose of grounding neutral point with resistance is to inject resistance current into the fault point. Its resistance component current can limit the fault current moderately, improve the sensitivity of relay protection, limit the transient overvoltage to 2.6 times of the normal relative neutral point voltage, prevent arc overvoltage from damaging the main equipment and ferroresonance at the same time. Overvoltage has significant effect.