Insulation Class
27. October 2023
|By EKBoll
Insulating materials in transformers are classified into thermal classes (insulation classes) according to IEC 60085 and IEC 60216. This classification considers the maximum allowable temperatures of the insulating materials, with temperatures being reduced by the so-called hot spot value according to EN61558-1:2019-12.
The following insulation classes result:
Thermal Class A: 100°C
Thermal Class E: 115°C
Thermal Class B: 120°C
Thermal Class F: 140°C
Thermal Class H: 165°C
Transformers should not exceed the temperature values of these classes during intended use, considering also the ambient temperature.