基于瞬时相位一致的电力线路故障分析方法

随着新型电力系统的建设，故障稳态分量愈来愈难以获取，因此提出了一种利用故障暂态数据的基于瞬时相位一致的电力线路故障分析方法。首先将线路两端的故障电流电压暂态数据进行正弦函数表示，计算线路沿线电气量。然后根据故障点处两端的计算电压瞬时相位一致条件构造判据函数，确定故障位置。针对故障接地过渡阻抗不为纯阻性和多相接地故障各相过渡电阻不相等的一般情况，考虑三种接地短路故障，利用过渡电阻上电压电流瞬时相位一致条件计算故障点过渡阻抗参数。通过仿真案例和现场实际案例的分析，对比其他故障定位方法，所提计算电压瞬时相位一致方法的故障定位精度显著增加，且具有更强的适用性。依据过渡电阻上电压电流瞬时相位一致条件，可有效计算不同类型的故障过渡阻抗参数。

Fault analysis method for a power line based on instantaneous phase consistency

With the construction of the new power system, it is becoming increasingly difficult to obtain the steady-state component of a fault. Therefore, a power line fault analysis method based on instantaneous phase consistency using fault transient data is proposed. First, the transient data of fault current and voltage at both ends of the line are represented by a sinusoidal function, and the electrical quantity along the line is calculated. Then, according to the condition of instantaneous phase consistency of the calculated voltage at both ends of the fault point, a criterion function is constructed to determine the fault location. The general situation is that the transition impedance of the grounding fault is not pure resistance and the transition resistance of each phase of the polyphase grounding fault is not equal. Considering three kinds of ground short-circuit faults, the transient impedance parameters of the fault point are calculated using the condition of instantaneous phase consistency of voltage and current on the transition resistance. Through the analysis of simulation cases and actual field cases, and compared with other fault location methods, the fault location accuracy of the proposed method for calculating instantaneous phase consistency of voltage is significantly improved, and it has stronger applicability. From the effect of instantaneous phase consistency of voltage and current on the transition resistance, different types of fault transition impedance parameters can be effectively calculated.