Author(s)

P.J. Nolan & N. Howie

Abstract

The supervisory alarm systems of modern power plant components are very complex as they generally involve a number of interconnected logic systems each comprising large numbers of AND, OR and NOT gates, Flip-Flops, Delay circuits and other logic elements. The derivation of rules, such as those required for an Expert System for real time fault location, is quite a difficult task and requires extensive plant knowledge and well as detailed familiarity with the logic circuits. This task is all the more formidable because of the delay elements and the fact that there may be a number of feedback loops in the logic circuits. Because of the complexity of this task, attention is directed at using computer aids to automate the procedure as far as possible. This paper describes such a procedure. It comprises a net

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