An attempt is made to determine the effects of the agingenvironment on the performance of polyester engineering thermoplastics,and to determine if a simplified aging model can be used to determinethe long-term performance characteristics. Initial results on PET andPBT materials indicate that life can be predicted from the datagenerated through a short-time thermal analysis test method. Long-termlife in transformer applications, can be estimated from the datagenerated by thermal analysis by applying the applicable percentconversion aging line to the thermal cycle data or the long-termcompatibility data. From the testing completed thus far, it has beendemonstrated that severe thermal aging occurs under elevatedtemperature, in air. The effects of a transformer oil environment, tendto reduce the oxidation effects, and thermal cycling of the temperaturepositively reduces the thermal effect
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