An accurate fault location algorithm for transmission lines using parameter identification based on distributed model

Abstract

This paper proposed a novel time-domain fault location algorithm using one-terminal data. The algorithm is based on parameter identification and distributed transmission lines model, it uses the time-domain equations of the fault-superimposed components network to determine the fault distance. The fault distance, fault resistance and source parameters at the remote end are solved as the unknown variables of the equations. Firstly, the algorithm performs two-dimension search in fault distance and fault resistance plane, secondly solves the source parameters at the remote end continuously in time coordinate axis, finally the searching values of fault distance and fault resistance which make dispersion degree of opposite source parameters solutions least are regarded as fault location result. This algorithm eliminates influence of the fault resistance and the opposite source parameters on the fault location accuracy, which have been the main source of error for conventional one-terminal approaches. In addition, this algorithm uses the transient sampling data directly with short data window. The EMTP simulation results show the validity and high accuracy of the new algorithm. (7 pages)