Fault location algorithm using impedance compensation method (icm) for facts devices compensated transmission lines

Accurate fault location is essential in transmission lines to facilitate quick repair and resolution of the faulty line, to improve reliability and availability of the power supply. In this paper, a new distance protection algorithm is developed for locating fault in a transmission line compensated with shunt FACTS devices like STATCOM using an impedance compensation method (ICM). The proposed protection scheme/algorithm considers the impedance deviation angle () to correct/compensate the magnitude and phase of the fault loop, apparent impedance and accordingly calculates the actual distance of the fault location. The performance of the proposed method is evaluated and tested with an Indian test transmission system compensated with shunt FACTS devices for various fault types and locations. The results show that the new protection method effectively estimates the exact fault location by mitigating the impact of STATCOM on distance relay performance.