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Impact of GCSC on IDMT directional overcurrent relay in the presence of phase to earth fault

Zellagui Mohamed (LSP-IE Laboratory, Department of Electrical Engineering, University of Batna, Campus CUB, Street Med El Hadi Bouklouf, Banta, Algeria)
Benabid Rabah (Department of Electrical Engineering, Nuclear Research Center of Birine (CRNB), Djelfa, Algeria)
Chaghi Abdelaziz (LSP-IE Laboratory, Department of Electrical Engineering, University of Batna, Campus CUB, Street Med El Hadi Bouklouf, Banta, Algeria)
Boudour Mohamed (LSEI Laboratory, Department of Electrical Engineering, University of Sciences and Technology Houari Boumediene (USTHB), El Alia, Bab Ezzouar, Algiers, Algeria)

This paper presents the impact of GTO Controlled Series Capacitor (GCSC) parameters on the Inverse Definite Minimum Time (IDMT) Directional Overcurrent Relay (DOCR) based on the International Electrotechnical Commission (IEC) standards. The DOCR is used to protect a single 400 kV transmission line of the Algerian transmission network which belongs to the Algerian Company of Electrical and Gas (Group Sonelgaz). The effects of GCSC on transmission line protected parameters as well as fault current and DOCR operation time in the presence of phase to earth fault with fault resistance are investigated considering three scenarios.

Keywords: GTO Controlled Series Capacitor (GCSC), Apparent reactance, phase to earth fault, Directional Overcurrent Relay (DOCR), Inverse Definite Minimum Time (IDMT), operation time