Many people don’t know how to distinguish the grade of FR-4 epoxy board, which is a good choice as the transformer insulation materials?
FR-4 epoxy board temperature grade:
Insulation temperature class A, E, B, F, H, C, N, R.
Maximum allowable temperature (℃) 105,120,130,155,180,200,220,240
Winding temperature rise limit (K) 60, 75, 80, 105, 125, 135, 150, 170
Performance reference temperature (℃) 80,95,100,120,145,155,170,190
FR-4 epoxy board is the weakest link in the electrical equipment such as generators. Insulating materials are particularly susceptible to high temperature and accelerate aging and damage. Different insulation materials have different heat resistance, and electrical equipment with different insulation materials has different high-temperature resistance. Therefore, the general electrical equipment specifies the maximum temperature for its operation.