A Comparative Study of GCSC and TCSC Effects on MHO Distance Relay Setting in Algerian Transmission Line

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Author(s) Mohamed Zellagui | Abdelaziz Chaghi
Pages 220-228
Volume 2
Issue 2
Date February, 2012
Keywords Series Compensation, FACTS Devices, GCSC, TCSC, Transmission line HV, Distance relay, Zones Setting.

This paper presents a comparative study of the performance of distance relays for transmission line high voltage (HV) 400 kV in Eastern Algerian transmission networks at Group Sonelgaz compensated by two different series Flexible AC Transmission System (FACTS) i.e. GTO Controlled Series Capacitor (GCSC) and Thyristor Controlled Series Capacitor (TCSC) connected at midpoint of an electrical transmission line. The facts are used for controlling transmission voltage, power flow, reactive power, and damping of power system oscillations in high power transfer levels. This paper studies the effects of GCSC and TCSC insertion on the total impedance of a transmission line protected by MHO distance relay .The modified setting zone protection in capacitive and inductive boost mode for three forward zones (Z1, Z2 and Z3) and reverse zone (Z4) have been investigated in order to prevent circuit breaker nuisance tripping to improve the performances of distance relay protection. The simulation results are performed in MATLAB software.

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