Line Selection and Fault Section Location Based on Least Squares in Low-Voltage Leakage System
Aiming at the existing single-phase leakage fault line selection and fault section location in mine low-voltage power supply system,a scheme of single-phase earth leakage line selection and fault section location was proposed which was based on the least squares algorithm.In the scheme,firstly,to establish a mathematical model of least squares,and then to plug collected zero sequence current in each branch section into the least squares algorithm to get distributed capacitance sequence and insulation resistance sequence of different sections,and then to average distributed capacitance sequence and insulation resistance sequence,finaly,to select fault line and locat fault section on the basis of the polarity of the distributed capacitance average and insulation resistance average.The simulation model is built by MATLAB/Simulink and solved by several experiments and least squares algorithm.The results show that this method has high reliability in low voltage single-phase leakage line selection and section location.
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