Transmission line parameter-free fault location results using field data

Various types of transmission line fault location algorithms have been proposed in the past. One type of methods dispenses with line parameters, which is named line parameter free algorithm. This paper reports verification results based on field data for line parameter free fault location algorithms. The methods are two-terminal method, requiring voltages and currents from both terminals of a transmission line. The field data used are unsynchronized. In comparison, results obtained by classical methods that require line parameters are also presented. Results indicate that the parameter free algorithms yield comparable results with those obtained by classical methods that require line parameters, and thus may be desirable in practical applications, especially in cases of absence of line parameters. This paper also proposes a new method for quantifying the impact of potential factors on fault location accuracy based on probability theory.