The use of various rates of stress increase in progressive stress testing of insulation

Although it is essential to know the life of insulation at service stress, it is frequently impractical if not impossible to measure this life directly. Hence, service life is commonly inferred from accelerated aging tests in which one or more stresses have higher than normal values. Accelerated tests in which the stress of interest is continuously increased, commonly called progressive stress tests, have received considerable attention recently.
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