The insulation class of a transformer is not a concept of dielectric strength, but is a permissible temperature rise criterion, ie, insulation class refers to the heat-resistance grade of the insulation material used, which is classified into Classes A, E, B, F, and H. The insulation temperature class is divided into A grade E grade B grade F grade H grade. The specific allowable temperature rise standards for each insulation class are as follows:
The maximum allowable temperature (°C) 105 120 130 155 180
Winding temperature rise limit (K) 60 75 80 100 125
Performance reference temperature (°C) 80 95 100 120 145
The maximum allowable temperature (°C) 105 120 130 155 180
Winding temperature rise limit (K) 60 75 80 100 125
Performance reference temperature (°C) 80 95 100 120 145
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