Definition of insulation level
Insulation level refers to the heat resistance level of the insulating material used in the winding of the motor (or transformer). There are five types of insulation materials commonly used in motors and transformers: A, E, B, F, and H. The insulation material of each insulation class has corresponding limit allowable working temperature (the hottest temperature of the motor or transformer winding). When the motor or transformer is running, the temperature of the hottest point of the winding must not exceed the requirements in Table 6-1, otherwise it will cause accelerated aging of the insulation material and shorten the life of the motor or transformer. Transformer burned.