Fault location algorithm for long distance transmission lines using samples at both ends

Transmission line fault location is an important problem in electric power systems. The conventional method for fault location, which uses samples at one terminal, can not deal with the influence of the fault resistance. A new algorithm is introduced in this paper, which requires synchronized samples of currents and voltages from two ends of a line, could eliminate the influence of fault resistance. A distributed parameter line model and the travelling wave approach are used for the proposed algorithm. It is applicable for long distance lines since shunt capacitance is taken into account. An EMTP simulation shows that the method is very accurate.