A Faulty Feeder Selection Method based on Improved Hausdorff Distance Algorithm for Neutral Non-effectively Grounded System

lAnalyze the phase-frequency characteristics of equivalent impedance, the fault characteristics in the high frequency band and low frequency band are determined.lDrawing on the relevant principles of dot product, it is applied to the processing method of the fault characteristics in the high frequency band and low frequency band.lThe Hausdorff Distance algorithm is improved to avoid deviations from disturbance of some noise.lThe improved algorithm is utilized to obtain the dot product matrix, and the faulty feeder could be identified based on comparison of the size of the element value in each row of the matrix.lThe proposed method can identify the faulty feeder not only for SPG faults but for two-phase grounding faults. Faulty feeder selection is a very important issue to ensure power supply reliability when a single-phase to ground (SPG) fault occurs in the distribution network. In this paper, a faulty feeder selection method based on improved Hausdorff distance (IHD) algorithm is proposed in the neutral non-effectively grounded system. Through the analysis of the phase-frequency characteristics of equivalent impedance, the fault characteristics in the high frequency band and low frequency band are determined. Then, the dot product of the fault characteristics can be calculated, and the IHD algorithm is utilized to obtain the dot product matrix. Finally, if the maximum value of one or more rows elements in the matrix is less than the sum of the remaining elements, it is judged as the bus fault, otherwise, the feeder corresponding to the maximum sum of the elements in the row is determined to be the faulty feeder. Simulation and recorded field data show that the proposed method can accurately select the faulty feeder under diverse fault conditions.