Transmission line fault location algorithm using trust-region method and two-terminal unsynchronised data

The traditional time-domain algorithms may cause many errors if the line parameters often change because of voltage level, environmental factors, transmission distance and so on. Furthermore, the unsynchronized two-terminal data will also affect the accuracy of time-domain algorithms. In order to overcome the errors caused by the traditional methods, this paper presents a new unsynchronized two-terminal transmission-line fault location algorithm without requiring line parameters after analyzing the fault location algorithms at home and abroad. The voltage and current measurement at both ends of a transmission line during a fault are assumed to be available and the unknowns can be obtained by utilizing the trust-region algorithm and the result of fault-location can also be obtained. Evaluation studies using field data show that the proposed algorithm is effective and reliable.