Protective Relays’ Developments and Trends

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One of the most complex disciplines in Electrical engineering is the Power System Protection which requires not only the well understanding of the different components of power system and their behaviors but also the good knowledge and analysis of the abnormal circumstances and failures that can occur in any element of power system. Moreover, the rapid changing and development in relays principles as well as in their technologies are additional factors that oblige those people working in the field to expand and update continuously their knowledge. In this paper, we tried to shed light on the evolution of protective relays from the onset of the electrical energy to our days. We tried also to foresee the future prospects and trends in this area. I. Introduction Protective relaying is an integral part of any electrical power system. The fundamental objective of system protection is to quickly isolate a problem so that the unaffected portions of a system can continue to function. Protective relays are the decision-making device in the protection scheme [1]. These relay knew, through more than a century, an important change in their functionalities and technologies. Each change brings with their odds and improvement in both technical and financial aspects. In this paper, we tried to shed light on the evolution of protective relays since the onset of the electrical energy to our days. We tried also to foresee the future prospects and trends in this area. II. Historical background Since the early days of the onset of electrical power the need of devices that allow to avoid the undesirable events in power system had been prescribed. The history of protective relays refers to more than... ... middle of paper ... ...NG, vol. 60, no. 5, 2009. [21] Internet-Forum: «Suggestions of Experienced Relay Specialist», http://rza.communityhost.ru/. [22] V. Gurevich, "PROBLEMS WITH EVALUATION OF THE RELIABILITY OF RELAY PROTECTION," Электротехнические комплексы и системы управления, no. 3, pp. 56-59, 2010. [23] A. ABDELMOUMENE and H. BENTARZI, "Reliability Enhancement of Power Transformer Protection System," Journal of Basic and Applied Scientific Research (J. Basic. Appl. Sci. Res., 2(10)10534-10539, 2012). [24] U.S.NRC, "Development of quantitative software reliability models for digital protection systems of nuclear power plants," United States Nuclear Regulatory Commission, Office of Nuclear Regulatory Research, 2011. 25] IAEA, "Modern instrumentation and control for nuclear power plants : a guidebook.," International Atomic Energy Agency, Vienna, 1999.

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