Comportamento Térmico de um Transformador de Potência Refrigerado por Óleo Dirigido/Forçado Diante da Variação da Vazão da Bomba Hidráulica

Abstract

Power transformers are essential equipments for the electrical system and their useful life is regulated by internal temperatures that accelerate the degradation of their solid insulation. In this sense, studies to understand and improve the thermal performance of these equipments are justified. This article presents a thermal performance analysis of transformers with directed/forced oil cooling system, through heating tests carried out in a prototype unit equipped with 31 fiber optic sensors to measure temperatures along its active part and points such as oil top and radiator inlet. Also, through a complete test setup, the oil circulation speed imposed by the hydraulic pump was varied and its impact on each of the cooling systems was evaluated. In this way, the obtained results make it possible to evaluate the performance of cooling systems under different conditions, contributing to transformer thermal designs and operation.