A self-organizing fuzzy logic based protective relay-an application to power transformer protection

In the paper the fuzzy logic based multicriteria protective relay for three-phase power transformer is presented. Twelve criteria used to stabilize the relay are introduced and integrated by means of multi-objective decision-making methods, The introduced protection scheme contains several internal functions and coefficients which are subject to offline pre-installation self-setting. Three unique procedures are delivered for self-adljusting the relay, and thus, making it self-organized. The included results of testing show significantly gained both sensitivity and selectivity of the self-organized relay comparing with traditional approaches.