Análise da corrente de fuga de isoladores poliméricos para classificação das condições de degradação com auxílio de lógica fuzzy.

Abstract

This paper aims to propose a technique for classifying polymeric insulators according to the analysis of leakage current signal. Based on the relationship between the low frequency harmonics, the proposed technique seeks to determine the state of degradation of isolators, eliminating interpretative elements that are crucial in visual inspections. For this was related to the fundamental component, the third, the fifth and the seventh harmonic of the signal obtained during the tests on samples of polymer insulators of 230 kV in different degradation states arising from the use in the transmission lines. Using Fourier Fast Transformed (FFT), gave the signal amplitudes at the desired frequency, and on these results we proposed a fuzzy logic system to assist in decision making. The technique was effective in the laboratory, and it was possible to prove how much the behavior operative state of insulators interferes in the characteristics of the leakage current signal.