The grounding mode of neutral point of power grid directly affects the insulation level, voltage level, reliability of power supply and the way of line protection.The grounding fault is closely related to the neutral grounding mode of power system.The same fault condition but in different neutral grounding mode, the fault characteristics, consequences and harms of grounding fault are different, so the protection strategies are different as well.Based on the three kinds of grounding modes which are direct grounding, non-grounding and arc-suppression-coil grounding, the fault characteristics of the three kinds of grounding being the objects of study, the MATLAB software was used to modeling simulation and then the theoretical comparison analysis was done on the results.The simulation results show that the theoretical analysis results are in accord with the simulation and the engineering practices.%电力系统的接地故障与中性点的接地方式密切相关,从而对应的保护策略也会不同.以电力系统中性点直接接地、不接地以及中性点经消弧线圈接地等3种接地方式等效电路为基础,以故障特征为研究对象,利用MATLAB/Simulink软件建模进行仿真并对其结果进行理论对比分析.仿真结果表明,上述3种工况下的理论分析结果和仿真结果吻合并符合工程实际.
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