Accurate Time-Domain Fault Location Method on Practically Transposed Transmission Lines

Accurate fault location reduces time searching for the fault and the power system operational cost. This paper proposes a time domain fault location method for practically transposed transmission lines. Unlike the ideally transposed lines which assumed to be transposed infinite number of times, the transposed lines in practice is transposed for very limited times. First, the practically transposed line is modeled as a nonhomogenous line, consisting of several untransposed line sections. Afterwards, the eigenvalue decomposition is applied to decouple each untransposed line section and the Bergeron model is applied to solve the voltage distribution through the entire nonhomogeneous line. Finally, the voltage method is applied to locate the fault using the calculated voltage distribution. Extensive numerical experiments verify that the proposed fault location method presents higher fault location accuracy compared to the existing method that simply assumes ideal transposition for practically transposed transmission lines.