Abstract
In the paper a novel approach to over current protection
stabilization based on FUZZY Logic technique is presented. The scheme is intended
for MV overhead lines for which the auto enclosure function is applied to enhance
reliability of supply in case of intermediate the feeders supplying a part of network
with numerous loaded MV/LV transformers that may face inrush conditions after
reemerging the line. Traditional harmonic effective for line over current protection
because of different current spectrum as measured at the MV bus bars. The new FL
protection developed takes both current and voltage signals for further processing
and final decision is issued as a result of partial decision support coefficients.
Application of signal fuzzification an fuzzy setting enabled obtaining a relay with
increased sensitivity, reliability and much faster than commonly available solutions.
The developed fuzzy protection scheme has been tested with EMTP signals and
compared with other standard protection approaches.
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