What is the difference of H class and F class in Tricast cast resin dry type transformers ?

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The main difference is that the class designations refer to the withstand temperature of the insulation material in Tricast cast resin dry type transformers. Thus, H class has a wihstand temperature level of 180 ⁰C for the coils and F class of 155 ⁰C for ambient design temperature of 40 ⁰C.