APPLICATION OF FUZZY LOGIC TO A LEAKAGE CURRENT RELAY

Document Type: Regular Paper

Author

Dept. of Electronic Eng., Engineering Faculty, Ataturk University, 25240, Erzurum, Turkey

Abstract

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

Keywords