Classificação de sinais de radiofrequência para discriminação de isoladores de alta tensão.

Abstract

Hiht voltage electrical insulators when subjected to higt voltage emit RF signals due, mainly, to the occurrence of corona. This effect is enhanced by a polluted environment, compromising the insulators functionalities. This papaer presents a means for classifying the state of insulators used in higt voltage aerial transmission line based on the radio frequncy signals emitted by them. We present a method for estimating clean or polluted state in which the insulator is. These methods are based on statistical analysis of the spectrum, where it evaluates the average and standard deviation of the signals. In order to obtain the necessary data for the alalysis were performed three experiments using insulators which were in different use conditions, most of them donated by CEAL.