Effect of GCSC Parameters on Distance Relay Measured Impedance in the Presence of Phase to Earth Fault

Abstract

This paper presents the impact study of GTO Controlled Series Capacitor (GCSC) Parameters on MHO distance relays measured impedance for 220 kV protected electrical transmission line in the presence of phase to earth fault. The study deals with a 220 kV single electrical transmission line of Eastern Algerian transmission networks at Group Sonelgaz (Algerian Company of Electrical and Gas), compensated by series Flexible AC Transmission System (FACTS) i.e. GCSC connected at midpoint of the line. The transmitted active and reactive powers are controlled by three GCSC’s. The effects of maximum reactive power injected as well as injected maximum voltage by GCSC on distance relays measured impedance is treated. The simulations results investigate the effects of GCSC injected parameters on measured resistance and reactance in the presence of earth fault with resistance fault for three cases study.