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A fuzzy-set approach to fault-type identification in digital relaying

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3 Author(s)
A. Ferrero ; Dipartimento di Elettrotecnica, Politecnico di Milano, Italy ; S. Sangiovanni ; E. Zappitelli

Sometime the operations that a relay is required to perform cannot be easily described in a deterministic way. A significant example of this situation is given by the operations a line relay must perform in order to detect the type of fault (line-to-ground, line-to-line, line-to-line involving ground). Recently, the mathematical theory of fuzzy sets featured many practical applications, mainly in industrial controls, and fuzzy-set processors are available to allow real time applications. This paper shows that a fuzzy-set approach can be useful even in digital relaying, whenever “fuzzy” decisions have to be under-taken. A possible application to the detection of the type of fault when symmetrical component relaying techniques are adopted is proposed and the results of simulation tests are given

Published in:

IEEE Transactions on Power Delivery  (Volume:10 ,  Issue: 1 )