A methodology for power system protection design based on an intelligent system approach

This paper presents a knowledge-based approach to the design of protection systems and their associated equipment. The paper begins with an examination of the characteristics of an expert system, its properties and benefits. These follow a discussion of the basic structure of a knowledge-based system with particular reference to protection systems. A standardized methodology is then introduced whereby a design can be produced to meet a set of specifications. To illustrate this process, the protection systems of a typical substation are outlined by applying the various steps of the methodology and providing the appropriate explanations. A principal characteristic of this expert system is the attention given to the coordination that should exist between the protection system design and that of the power system itself so that the protection function is an integral part of power system operation.