APPLICATION OF FUZZY LOGIC TO A LEAKAGE CURRENT RELAY

Abstract

The design and application of a fuzzy logic based controller to a leakage current relay waspresented in this paper. A novel approach based on fuzzy logic to form the tripping action of leakagecurrent relay was investigated. In addition to the theoretical aspect of fuzzy logic, detection of a leakagecurrent, measurement of the leakage current, determination of its duration, trip opening of faulty casesand detailed system architecture were also introduced. The inspected fuzzy logic technique to control thetripping action of the leakage current relay was intended to improve the performance of conventionalleakage current relay control for human safety and system reliability. The relationship between thecontrolled output of the fuzzy processor and properties of leakage current for the proposed relay wasexplored by using a graphical output expression. It was observed that the proposed leakage current relaybased on fuzzy logic was more reliable than conventional leakage current relay.