IIARD International Institute of Academic Research and Development

International Journal of Engineering and Modern Technology (IJEMT )

E-ISSN 2504-8848
P-ISSN 2695-2149
VOL. 10 NO. 7 2024
DOI: 10.56201/ijemt.v10.no7.2024.pg127.139

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Enhancing Electrical System Reliability Through Advanced Relay Coordination Techniques: A Focus on Indorama Fertilizer and Chemicals Limited

Nkoro Emmanuel, Hachimenum N. Amadi, Dan J. Horsfall

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Abstract

The research addresses the challenge of inadequate relay coordination at the motor control center of Indorama Fertilizer and Chemicals Limited. Utilizing the Electrical Transient Analyzer program (ETAP 19.0.1), the study employs methodologies such as Load Flow Analysis, Short Circuit Analysis, and Relay Setting and Coordination with Standard Inverse Time Delay (SIT) to model and simulate the electrical network. Findings reveal that during a base case scenario, a trip sequence failure occurs when a three-phase short circuit fault arises at the terminal of the synchronous motor labeled (syn1). The backup relay (R4) activates first at 286.5 ms, followed by the primary relay (R6) at 408.1 ms, relay 2 at 630.4 ms, and relay 1 at 864.5 ms. This miscoordination results in a total blackout of the Motor Control Unit (Cmtr1) due to a single downstream fault. To enhance coordination, a new relay setting is proposed, implementing IEC standard inverse characteristics to replace the existing definite-minimum-time (DMT) scheme with a more adaptable inverse-definite-minimum-time (IDMT) scheme. The revised configuration reduces the relay operation time by over 35% compared to the original setup, providing better fault backup and significantly improving the relay's operational sequence and tripping times without major coordination issues.

keywords:

Fault Analysis, ETAP, Inverse Definite Minimum Time, Motor Control, Relay

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References:

Amakiri, O. F., Idoniboyeobu, D. C., Ahiakwo, C. O. & Braide, S. L. (2019). Improvement of
33KV overcurrent protection scheme for Effurum Transmission Substation at PYI Road,
Delta State, Nigeria. American Journal of Engineering Research (AJER), 8(4), 16-27.
Hima, A. P., Vaibhar, M. S. & Anuradha, D. (2015). Relay coordination using ETAP. International
Journal of Scientific & Engineering Research, 6(5), 1583-1588.
Horsfall, D. J., Idoniboyeobu, D. C., Ahiakwo, C. O., &Braide, S. L., (2021). Relay Coordination
Analysis in SPDC Forcados Distribution Network for Operation, Planning and Future
Expansion. Journal of Newviews in Engineering and Technology (JNET), 3(4), 18-27
Idoniboyeobu, D. C., Braide, S. L. & Igbogidi, O. N. (2018). Improve Relay coordination in Port
Harcourt Distribution Network case study of RSU 2 x 15MVA, 33//11KV injection
substation
Mancer, N., Mahdad & Srairi, K. (2015). Optimal coordination of directional overcurrent relays
using PSO-TVAC considering series compensation. Power Engineering and Electrical
Engineering, 13(2), 96-106.
Mohammed, K. & Mohammed, M. S. (2020). Protective relay coordination in a power system
network using particle swarm optimization technique. International Journal of
Engineering and Technology Research, 19(5), 11-22.
Ohore, T. U., Idoniboyeobu, D.C. & Braide, S. L. (2021). Upgrade Trans-amadi 33kv network for
protective relay coordination using short-circuit current calculations technique. American
Journal of Engineering research (AJER),10(5), 2320-0936

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