Thermal Aging Characteristics of Insulation Paper in Mineral Oil in Overloaded Operation of Transformers

摘要

A sudden capacity increase in demand during the summer peak, or in contingencies such as malfunctioning transformers, may cause an overload in normal transformers. In this paper, on the basis of overloaded transformer operation in distribution substations, thermal aging testing in oil was carried out under various overload patterns, such as short-term overload and long-term overload, but with the winding insulation paper's lifespan loss kept constant. From the results, various characteristics, such as the mean degree of polymerization and production of furfural and (CO_2+CO), and their effects on the lifespan loss of the insulation paper, were obtained.