Abstract
Ageing degradation of cellulose insulation in power transformers increases with operating cycles in a cumulative manner and may lead to the failure of power transformers. In this study a cumulative degradation model for the ageing of cellulose insulation is proposed. The concept of degradation accumulation is applied to predict the life of cellulose insulation; a degradation evaluation function, called the degree of degradation, is introduced to represent the ageing of cellulose paper insulation. The model has been applied to explain the experimental data of Kraft paper over a wide ageing temperature range from 60°C to 160°C. The results indicate that the model gives a good description of the evolution process of ageing degradation of cellulose insulation.
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