Transformer neutral grounding is a comprehensive,systematic problem,the direct impact on system equipment insulation level, the system over-voltage level,over--voltage protection components,the choice of fault current extent of the damage to the faulty equipment and relay protection configuration and movement behavior,operation of the system reliability. Company 3 HV transformer using low--impedance grounding the neutral point,with one or two are quite different,in--depth analysis of this paper,for the relevant professional information.%变压器中性点接地方式是一个综合性的、系统性的问题，直接影响到系统设备绝缘水平、系统过电压水平、过电压保护元件的选择，故障电流对故障设备的破坏程度以及继电保护的配置和动作行为方式，系统的运行可靠性等。公司三期高压厂变中性点采用低阻接地方式，与一、二期有较大差异，本文对此进行深入分析，供相关专业人员参考。
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