A fault location algorithm for high voltage overhead power transmission line based on line parameter estimation

In existing fault location algorithms the parameters of power transmission line are regarded as known constants, so the accuracy of fault location depends on that of the value of parameters. Here, a least-squares algorithm for fault location based on parameter estimation of transmission line is proposed in which the accurate value of the line parameters is not to be known and no hardware should be added. Using the data provided by the fault recorders equipped at the both ends of the transmission line, the on-line parameter estimation of the transmission line can be carried out and the position where fault occurs can be determined, therefore the influence of inaccuracy or variation of the line parameter value, which is caused by the practical factors on site, on the accuracy of fault location can be overcome. The results from theoretical analysis and simulation show that high accuracy of fault location can be obtained by use of the proposed algorithm.