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

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

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 AnalysisETAPInverse Definite Minimum TimeMotor ControlRelay

References

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

Abstract

Keywords

References

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