110kV变压器中性点接地方式与保护配置分析

电力系统中变压器中性点的接地方式和保护配置，是一个关系到电网安全运行的综合性问题，它与电压等级、电网结构、绝缘水平、供电可靠性等都有密切的关系。我国110kV及以上电网一般采用大电流接地方式，即中性点有效接地方式，发生单相接地故障时，暂态过电压水平较低，故障电流较大，继电保护迅速动作于跳闸以切除故障。主要研究分析了110kV变压器的接地方式及保护配置，并根据大港油田某变电站发生的实际案例来详细分析故障发生的过程及保护配置的必要性。

Analysis of Neutral Grounding Mode and Protection Configuration for 110kV Transformer

The neutral grounding mode and protection configuration for 1 lOkV transformer is a comprehensiveness ques- tion, which has close relationship with voltage classes, network structure, insulation level and power supply reliability. In our country,large current grounding method is widely used in l lOkV and above power grid, which means the neutral point is effectively grounded. In case of single-phase earth fault, the transient overvoltage level is lower and fault current is larger, the protective relay will act on trip to isolate fault. Neutral grounding mode and protection configuration for 1 lOkV transformer, along with process of failure and necessity of protection configuration has been researched and ana- lyzed in this article based on an actual case.