The main artificial intelligence techniques found in power systems applications are those utilizing the logic and knowledge representatives of expert systems, fuzzy systems artificial neural networks and, more recently evolutionary computing. This paper deals with the design and application of intelligent relay using the first three areas. It describes in some detail the important attribute that these branches have, which make them particularly well suited for solving protection problems where traditional methods have limitations/difficulties. It also deals with some of the fundamental issues relating to AI technology that needs to be addressed in order to maximize the benefits/advantages that can be attained from these branches of AI, particularly when applied to protection; the aforementioned are supplemented by specific applications.
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