Microprocessor-Based Protective Relays Applications in Nigeria Power System Protections

  IJETT-book-cover  International Journal of Engineering Trends and Technology (IJETT)          
© 2015 by IJETT Journal
Volume-26 Number-2
Year of Publication : 2015
Authors : J.O. Aibangbee, S.O. Onohaebi


J.O. Aibangbee, S.O. Onohaebi"Microprocessor-Based Protective Relays Applications in Nigeria Power System Protections", International Journal of Engineering Trends and Technology (IJETT), V26(2),88-94 August 2015. ISSN:2231-5381. www.ijettjournal.org. published by seventh sense research group

Electric Utilities Company of Nigeria (EUCN) have traditionally used electromechanical (EMR) distance relays for the protection of transmission lines in the past, and many such relays are still in use in power systems today. In this paper, microprocessor-based protective relays (MPBRs) applications in the Nigeria power systems protection were investigated. This paper evaluates the performance of a transmission line protection scheme using Microprocessor-based protective and Electromechanical relays using discrete components, for comparison in terms of engineering design, installations, maintenances costs, and applications flexibility. Results shown that maintenance and design of protection schemes using EMR is expensive and time-consuming. MPBRs offer many advantages and benefits over EMR includes compactness, reliability, flexibility, number of installations components, maintenances costs, applications flexibility, are greatly reduced and improved monitoring and control functions. It reduces maintenance costs by providing self-test functions and high reliability, remote targets; metering data memory capabilities, fault location and status information to assist operations in restoration of electrical service. Fault location and event reports provide valuable information leading to improvement in the overall protection schemes. The overall scheme takes up less panel space, the design and wiring is simpler and less costly to implement. Installation and maintenance testing are greatly reduced.


[1] John J. Kumm, Mark S. Weber, E.O. Schweitzer, III, Daqing Hou, "Philosophies for Testing Protective Relays," 48th Annual Georgia Tech Protective Relaying Conference, Atlanta, Georgia, May 4-6, 1994.
[2] Lewis J. Blackburn and Thomas J.Domin “Protective Relaying Principles and Applications”, third edition, 2007. [3] Sachdev, M. S. “Advanced microprocessor Based Protection and communication”, IEEE Tutorial course. 1997.
[4] Brad. Hendenson, “Protection Relay setting management in the modern world; cigre conference 2008
[5] John J. Kumm, Edmund 0. Schweitzer, III, Daqing Hou, "Assessing the Effectiveness of Self-Tests and Other Monitoring Means in Protective Relays," PEA Relay Committee Spring Meeting, Matamoras, Pennsylvania, May 25-26, 1995.
[6] Stanley H. Horowitz and A. G. Phadke “Power System Relaying” Third edition, England RSP Ltd, 2008.
[7] Sachdev, M. S. “Advanced microprocessor BasedProtection and communication”, IEEE Tutorial course.1997.
[8] Mohindar S.and Sachdev V. “Understanding Microprocessorbased Technology applied to relaying,” Power System Relaying Committee 2004.
[9] Jeff Roberts, Edmund 0. Schweitzer, III, "Analysis of Event Reports," 16th Annual Western Protective Relay Conference, Spokane, Washington, October 24-26, 1999.
[10] Zejlan Chan “Advanced Microprocessor-Based Intelligent Relay for Multifunctional Protection system” November 1995
[11] Stanley E. Zocholl, Armando Guzman, Daqing Hou. “Transformer modeling as applied to differential protection”, Schweitzer Engineering Laboratories, Inc. Pullman, Washington, USA. 2007.
[12] Guzman A., S. Zocholl, G. Benmouyal, and H. J Altuve, “Performance Analysis of Traditional and Improved Transformer Differential Protective Relays”, SEL Technical papers 2002.

Power system, Microprocessor-based relays, electromechanical relays, engineering design, maintenances costs, protection schemes.