Faulted Section Identification and Fault Location in Power Network Based on Histogram Analysis of Three-phase Current and Voltage Modulated

In the discussion of fault location due to the existence of multiple branches in the distribution network, different locations are obtained and this shows the importance of detecting the faulted section in the distribution network. In this paper, the new idea of modulating the current and three-phase voltage of the line's beginning and histogram analysis has been used for fault location in the power network. First, threephases of current and voltage of the line's beginning are converted separately through convolution into a modulated current signal and a voltage signal, respectively. Then by dividing the density ratio of the modulated voltage by the modulated current, the distance to fault location can be estimated; but there is the possibility of obtaining several fault locations in the distribution network. In the following, the faulted section can be estimated through a histogram analysis of the modulated voltage. Simulation results show that by modulating the three-phase voltage, there is a possibility to eliminate the effects of fault resistance, fault occurrence angle, fault type on the algorithm's accuracy. In the end, the suggested algorithm was implemented on a 735 kV transmission network and an IEEE-15bus distribution network whose results demonstrate the appropriate accuracy of the suggested algorithm.