Line fault location research based on two-terminal asynchronous data

Abstract：In order to improve the accuracy of the distance measuring, a new approach to fault location based on distributed parameter model, which voltages and currents of the two ends of the transmission line do not need to be measured synchronously, is presented in the paper.The method was aimed at the existing problem on 10kV line, such as single-phase ground and two-phase short circuit.By using the asynchronous angel for asynchronous factor of two-terminal data sampling, the equation of fault location and the asynchronous angel is established.In order to improve the location accuracy, the average of asynchronous angle of many points are used as asynchronous angle.The single-phase ground fault circuit simulation model of the rural network 10kV is established.Simulation results by the Matlab and real data validation show that the algorithm is not only of high accuracy and robustness, but also not affected by fault resistance, fault type, fault location and incidence angle of the fault occurrence.

Keyword：transmission line;fault location;two-terminal asynchronous data;Matlab simulation;

Received：2008-12-09