谐振接地系统单相断线并电源侧接地故障电压特征分析

Voltage Characteristics Analysis of Single-phase Disconnection With Power Resource Side Grounding Fault in Resonant Earthed System

针对谐振接地系统,综合考虑阻尼率、失谐度、接地过渡电阻、断线位置、故障线路零序电容占系统总零序电容的比例以及负荷阻抗等多方面因素,建立了谐振接地系统单相断线并电源侧接地故障分析模型。全面分析了中性点电压及断口上下游各相电压、线电压的幅值及相位在各因素影响下的变化规律,并给出电压变化特征值。基于MATLAB/Simulink仿真软件对示例配电网进行仿真验证,仿真结果验证了理论分析的正确性,可为配电网断线故障辨识定位提供理论依据。

Aiming at the resonant earthed system,this paper establishes an analysis model for the single-phase disconnection with the power resource side grounding fault in a single resonance grounding system,which takes into account the damping rate,the out-of-resonance degree,the grounding resistance of the sinking point,the disconnection position,the ratio of the capacitance to ground of the fault line and the load impedance.The changing characteristics of the amplitude and angle of the neutral point voltage,the upstream and downstream phase voltage and the line voltage of the fracture under the influence of these factors are analyzed comprehensively,and the characteristic values are given.A sample distribution network is simulated based on the MATLAB/Simulink software,and the simulation results verify the correctness of the theoretical analysis,which provides a theoretical basis for the identification and location of the disconnection faults of the distribution network.