The Method of Lifespan Prediction of Insulating Paper Utilized in Converter Transformer Considering the Mechanical Stress

摘要

The paper oil insulation in the power transformer is in a complicated environment, and the insulating paper will withstand the mechanical stress mainly of tensile stress. When the tensile stress and thermal stress coexist, it will have a certain impact on the aging life of the insulation paper. This paper carried out tensile-thermal joint aging experiment of insulating paper, and the change rule of the degree of polymerization of insulating paper during aging is obtained. The accumulative loss rate of polymerization degree of insulating paper under different aging conditions is calculated. Finally, the aging life of insulating paper under different tensile stress intensity and temperature is obtained by using the time-temperature superposition method combined with the influence factor of tensile stress.