Effect analysis of shunt device on Distance protection in PSCAD and MATLAB for L-G fault

This paper presents analytical procedure and simulation results of distance relay for the application of protection of transmission line with STATCOM and simulation results for investigating the operation of Distance relay in a power system containing flexible alternating current transmission (FACTS) controller such as static synchronous compensator (STATCOM) in PSCAD and MATLAB. An apparent impedance calculation procedure for transmission line incorporating STATCOM based on the power frequency sequence circuits has been explored. When STATCOM is connected at the midpoint and fault is after STATCOM have great impact on distance relay tripping characteristics. The simulation results show the impact of STATCOM on distance relay during phase to ground fault condition. In the presence of STATCOM, its controlling parameters as well as its installation location also affect the tripping characteristics. Here, simulate the Distance Relay and plot the zones and create fault in different zones and show the result with and without STATCOM. The simulation results are presented in relation to typical 300km transmission line, 400KV transmission system employing STATCOM.