An accurate fault location algorithm based on distributed parameter line model

To remove the effect on two-terminal fault location by load current and imperfect line model, an accurate fault location algorithm based on distributed parameter line model is proposed in this paper. Basing on the wave equation of homogeneous transmission line, the fault location is directly calculated by using positive sequence fault components of voltages and currents derived at both line ends, as well as line positive sequence parameters. The algorithm does not need fault type identification, and its accuracy is not affected by fault resistance, system impedance , pre-fault load current and shunt capacitance. The EMTP based digital simulation has shown its correctness and high accuracy.