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基于模式识别的思想,本文提出了一种新型故障定位思想,首先从理论上推导出在频率变化时,系统阻抗角发生正负变化(称为阻抗角翻转)的位置随短路地点的不同而改变。其次说明了过渡电阻对阻抗角翻转的位置影响甚微。因此当发生对地短路故障发生后,可在电源端注入可调频的信号源,对故障过程中电源端的暂态电流和电压采样信号进行快速傅立叶(FFT)分析,通过不同高频信号对应的阻抗角变化来识别故障位置。仿真结果证实了该方法的有效性。
Based on the idea of pattern recognition, this paper presents a new idea of fault location. First, it is deduced theoretically that the position of the system impedance angle change (referred to as the impedance angle reversal) changes with the short-circuit point when the frequency changes. . Second, it shows that the transition resistance has little effect on the flip angle of the impedance. Therefore, when a short-circuit to earth fault occurs, a frequency-adjustable signal source may be injected into the power terminal to perform fast Fourier transform (FFT) analysis on the transient current and voltage sampled signals at the power terminal during the fault process. The impedance corresponding to different high- Angle changes to identify the location of the fault. Simulation results confirm the effectiveness of this method.