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[3]
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[4]
International Electro-technical Commission．IEC 60216 -1 Electrical insulating materials properties of thermal endurance Part1: Ageing procedures and evaluation of test results[S]．Geneva：2001．
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International Electro-technical Commission．IEC 60216 -3 Electrical insulating materials thermal endurance properties Part3: Instructions for calculating thermal endurance characteristics[S]．Geneva：2001．
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Institute of Electrical and Electronic Engineers．IEEE Standard 101-2004 IEEE Guide for the Statistical Analysis of Thermal Life Test Data[S]．New York：2004．
