Allowable temperature rise refers to the limit of temperature rise relative to the ambient temperature.
Insulation temperature classes a, e, b, f and h.
Maximum allowable temperature (℃)105120130155180.
Winding temperature rise limit (K) 60 75 80 100 125
Performance reference temperature (℃) 8095100120145.
Insulation material is the weakest link in electrical equipment. Insulating materials are particularly susceptible to high temperature, which will accelerate aging and damage. Different insulation materials have different heat resistance, and different insulation materials have different high temperature resistance of electrical equipment. Therefore, the maximum working temperature of general electrical equipment is specified.
According to the high temperature resistance of different insulating materials, seven allowable maximum temperatures are specified, which are arranged as follows: Y, A, E, B, F, H and C, and their allowable working temperatures are 90, 105, 120, 130 and1respectively.