Abstract

Thermal endurance test results on polyhydantoin film are presented, performed both in the conventional atmospheric conditions and in the conditions fulfilling the requirements for the equalized ageing process. The basic principle of the Equalized Ageing Process method (EAP) for thermal endurance testing of solid electrical insulating materials is to make the ageing process at the test temperature equal to that at the service temperature, by changing the test atmosphere appropriately. In an equalized ageing process all the chemical ageing reactions are accelerated equally.

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