New fault location technique for series compensated transmission lines

A new fault location algorithm for series compensated transmission line utilizing two-terminal unsynchronized voltage and current measurements is presented in this paper. The distributed parameter line model is adopted to fully take into account the shunt capacitance. The fault impedance is assumed to be pure resistive. By formulating the fault current in terms of unknown fault location, boundary conditions under different fault types can be made use of to derive the fault location. Two subroutines assuming the fault occurs on the left or right side of the series compensator are developed and the principle to identify the correct fault location estimate is described. Matlab SimPowerSystems is utilized to simulate the faults of various conditions and generate the voltage and current waveforms from both terminals of the series compensated single-circuit line. The fault location results are quite accurate based on simulation studies.