Estudo do comportamento da resistência de isolamento em transformadores a óleo de 15MVA – 72,5/15kV

Abstract

This work will present an applied study of solid insulation in oil transformers and its agents of the insulating mass being the electrical distances between the differences in constructive potential, the insulating paper, the insulating mineral oil and the ambient humidity of the manufacturing process. This study is based on the measurement of the insulation resistance that reflects values which define the condition of the insulation and the absence of a minimum mass of moisture in insulating transformers. An analysis of the principle and method of measurements will be presented, checking types of devices, single-wire circuit, the transformer measurement sites, behavior of the measurement over time and mainly information resulting from the measurement about the behavior of the insulating paper and the insulating oil to the exposure of the moisture.