Protective Relays’ Developments and Trends

2002 Words5 Pages

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...

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