A new method of faulty line selection method based on model recognition for Petersen coil grounded system is presented. The equivalent circuit of every line is modeled as capacitance during fault characteristic frequency band. The initial value of capacitance is calculated by transient information through least square fitting. Then capacitance value calculated by the steady-state signal is compared with the initial value. It is found that fault line does not meet the established capacitance model and model error is large; while the sound line is basically in accordance with the established capacitance model and the model error is close to zero. Based on these characteristics, faulty line selection criteria is constructed. This method has a bootstrap characteristic. Simulation and field recording data show that the proposed method is feasible.%基于模型识别的继电保护思想提出了一种消弧线圈接地系统单相接地故障选线新方法.在特征频带内将线路等效成电容模型,首先利用故障暂态信号通过最小二乘方法求解出各出线的电容初值,然后用故障稳态信号求解电容值并与电容初值比较.由于故障线路不符合所建立的电容模型,模型误差较大;健全线路基本符合所建立的电容模型,模型误差接近于0,基于此特点就可以实现故障线路的识别.该方法具有自举性,通过仿真和录波数据验证了所提方法的有效性.
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