A New Theory for Locating Line Fault in Power System: Simulation Part

Three time-reversal-based fault location methods are derived from the theoretical part of this paper, which is named currents-in-time-domain method, forward-currents-in-frequency-domain method, and forward-currents-in-frequency-domain-with-compensation method, respectively. The first proposed method utilizes only the decomposed transient currents in the time domain to calculate the RMS values of the fault currents of assumed fault in a lossless mirror line. The location where the peak value is located is the calculated fault location. The second method uses the forward current in the frequency domain to calculate the RMS values of the fault currents of assumed fault in a loss mirror line. The location where the minimum value is located is the calculated fault location. The third method first calculates the RMS values of fault currents of assumed fault in lossless mirror line, and the fault location is selected from the peak value. Then the final fault location result is compensated by the pre-calculated error for each assumed fault location. A two-terminal AC transmission system is established for testing these three methods. The frequency-dependent lines including homogeneous and inhomogeneous lines are taken into the simulated system for a large number of tests.