Impact of TCSC on distance protection relay on power transmission lines
Abstract
This paper investigates the impact of thyristor controlled series capacitor (TCSC) on the distance relay on transmission lines. Voltage and current measurement data at the relay positions are collected and calculated for the apparent impedance measured in the modes with and without TCSC installed on the line. Short circuit faults occur at different locations on the power transmission lines surveyed in order to calculate and locate the fault which occurred on the line for the purpose of evaluating the impact of TCSC on the distance relay. Matlab/Simulink software is used to model the schematic diagram of a simple power system consisting of a transmission line with two sources at the two ends, source blocks, line blocks, TCSC blocks, measurement of voltage and current blocks, discrete Fourier blocks are also integrated on the model. The simulation results show that the impact of TCSC on the distance protection relay in determining the apparent impedance and location of the fault in the transmission line.