Classification of insulation materials

transformer pressboard insulation and temperature are closely related. The higher the temperature, the worse the insulating properties of the insulating material. To ensure the insulation strength, each insulation material has a suitable maximum allowable operating temperature, below this temperature, can be used for long-term safety, more than this temperature will quickly aging. According to the degree of heat, the epoxy fiberglass tube is divided into Y, A, E, B, F, H, C and other levels, the heat resistance level corresponding to the following:
Y-class insulation temperature 90 ℃, A-class insulation temperature 105 ℃, E-class insulation temperature 120 ℃, B-class insulation temperature 130 ℃, F-class insulation temperature 155 ℃, H-class insulation temperature 180 ℃, Insulation temperature above 200 ℃.