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Paper Title : Optimal Coordination of Overcurrent Relay Protection Case Study Sawakin Substation

ISSN : 2395-1303
Year of Publication : 2020
10.29126/23951303/IJET-V6I6P8

Authors: Ezedin Osman Salih , Mugahid M. Elhassan Ibrahim, Mahmoud Izzelden Abdalzeem , Tareg Nabel Mahmoud , Fatima M. Abufatima Ahmed

         


Abstract
- Continuous and reliable power supply is the main goal and target for power system networks. Coordination is necessary to achieve proper fault identification and fault clearance sequence, without good protection coordination, the protection system will lose its features i.e. selectivity, dependability, and sensitivity. In this paper, the protection coordination is designed for Sawakin substation system using the conventional technique and simulating the system in ETAP software for validation. this paper presents two scenarios of different fault type and locations had been separately formulated and optimized. The time dial setting and plug setting of the selected overcurrent relays are designed according to the coordination procedures and constraints, to speed up the tripping times and to isolate the faulty section as soon as possible. The coordination starts first by coordinating the phase over-current elements, for different paths from furthest downstream (load side) up to the upstream (source side). Next, the earth fault relays are coordinated for the same paths and finally the instantaneous element as a backup protection was applied successfully.

Reference
[1] Shilpi Saini, “Overcurrent relay coordination for phase and earth faults using ETAP,” Electrical and Electronics Department, Amity University (AUUP), Noida, India, Proceedings of IRF International Conference, 2018, pp. 57-60. [2] Anupreyaa K and Sabari karthiga T C, “Relay Coordination for Distribution System,” Second International Conference on Science Technology Engineering and Management (ICONSTEM), 2016. [3] Abadia Gomez, Vanessa, “Load Flow Analysis of 138/69kV Substation Using Electrical Transient & Analysis Program (ETAP)” Electrical Engineering Undergraduate Honors Theses, 2019. [4] S. Mahapatra, D. Debniloy, S. A. Mishra, and K. Aditya, “Optimum Overcurrent Relay Coordination of a Power Grid,” Journal of Engineering Research and Applications, vol. 4, issue 4, pp. 39 – 44, April 2014. [5] Network Protection and Automation Guide, Protective Relays Measurement and Control, ISBN: 978-0-9568678-0-3 Published by Alstom Grid, (2011). [6] Ms. Serene C Kurian and Mr. K Navin Kumar, “Relay coordination in an 11kV substation using ETAP,” International Journal of Recent Innovation in Engineering and Research, pp.1-9, 2015. [7] Edwin Pho, “Overcurrent coordination study,” Electrical Engineering Department, California Polytechnic State University, San Luis Obispo, CA, 2009. [8] A. G. Phadke and J. S. Thorp, Computer relaying for power systems: John Wiley & Sons, 2009. [9] Juan M. Gers and Edward J. Holmes, “Protection of electricity distribution networks,” 2nd Edition, Institution of Electrical Engineers, London, United Kingdom, 2004.

Keywords
Relay Coordination, Overcurrent Relay, short circuit analysis, tripping sequence, optimal coordination of relay.