Research on the Interturn Insulation Life of Electromagnetic Coils Based on Dielectric Loss
As the core component of electrical equipment,low-voltage electromagnetic coils have a particularly promi-nent problem of inter turn insulation failure.To evaluate the insulation life between turns of low-voltage electromag-netic coils,accelerated thermal aging tests were conducted on the twisted pair samples made at 210℃,230℃and 250℃for 10 aging cycles respectively,to explore the influence of thermal stress on their electrical performance.The results show that as the aging temperature increases and the aging time increases,the dielectric loss shows a direct positive correlation with it.A failure rate model based on dielectric loss is proposed to determine the inter turn insu-lation life,and the accuracy of the proposed failure rate model is verified by fitting the temperature life curve with the Arrhenius model.The results show that the proposed failure rate model based on dielectric loss has an error rate of 0.744%,which has high accuracy in evaluating the inter turn insulation life.
accelerated thermal aging testdielectric lossinefficient modelinterturn insulation life
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