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A Line Selection Method Based on Transient Phase Current Variation Comparison

A new line selection method based on waveform comparison of sudden Phase Current Variation (PCV) is proposed to solve the problem of discriminant margin lack and prone to misjudgment in traditional faulty line selection method. By analyzing the characteristics of the faulty phase current, it shows that each phase current waveform of faulty line is different, and the Current Variation (CV) amplitude of the faulty phase is much larger than the normal phase, while the amplitude and waveform of each non-faulty line PCV are almost the same. This method defines the relative difference parameter to represent the waveform variation of each phase current. By calculating and comparing the value of the relative difference parameters, the maximum is selected as the faulty parameter of the faulty line. The simulation result shows that the method is not affected by line structure, fault type, operation mode and other factors, and it has significant advantages of applicability, economy and reliability when selecting the faulty lines.