Power Distribution System (PDS) is spread on different places. Therefore PDS has many laterals and load taps. Accurate fault locating in PDS causes to improve reliability indices and its efficiency. In this paper, an improved method is suggested for fault location in PDS which has a high accuracy. In the proposed algorithm, by using phase domain of distributed-parameter line model, a fifth order algebraic equation of fault distance is obtained which can improve the accuracy of determined fault distance for all types of faults. The proposed method is tested under different fault resistances which the results show low sensitivity to this parameter. To evaluate the accuracy of the proposed method, the modified IEEE 34- node test feeder is used and its efficiency and accuracy is proved.

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