Estudo da utilização de uma linha de transmissão planar com stub para determinação da quantidade de água em óleo de transformadores de potência

Abstract

In this work, a study on the use of a planar transmission line with a stub for measuring the amount of water in power transformer oil is presented. Water content is one of the indicators of oil quality, which in some cases can lead to equipment failures, resulting in significant losses. Additionally, current models for oil quality measurement require equipment and personnel displacement, leading to higher costs for these activities. This makes this study highly relevant for both academic and industrial environments. For the measurements, three measurement sets were performed, with each set aiming to bring an improvement for better results. In each measurement, water was added, and the analysis was carried out through the variation of results displayed on the network analyzer. Finally, it was observed that the use of the transmission coefficient for the maximum values obtained in each curve led to better results and also better approximations in regression models. Although there are still many challenges, the promising results open doors for the assembly of systems capable of sending data for constant monitoring..