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What is the relationship between transformer insulation level and temperature rise standard?

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What is the relationship between transformer insulation level and temperature rise standard?

2023.03.23

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Insulation level and temperature rise:

The insulation level of a transformer refers to the maximum allowable temperature rise, which is the heat resistance level of the insulation material used in the transformer. The temperature rise, on the other hand, refers to the temperature difference between the inside of the transformer and its surrounding environment.

The insulation level of transformers is classified into different levels, such as A, E, B, F, and H. Each insulation level corresponds to a different maximum allowable temperature rise limit. For example, the A-level insulation winding temperature rise limit is 60K, the E-level insulation winding temperature rise limit is 75K, the B-level insulation winding temperature rise limit is 80K, the F-level insulation winding temperature rise limit is 100K, and the H-level insulation winding temperature rise limit is 125K.

Insulation classmaximum allowable temperature(℃)Winding temperature rise limit (K)Performance reference temperature(℃)
A1056080
E1207595
B13080100
F155100120
H180125145

In summary, the insulation level of a transformer determines its heat resistance level, and the temperature rise limit sets the maximum allowable temperature difference between the inside of the transformer and its environment.

LuShan, est. 1975,  is a Chinese professional manufacturer specializing in power transformers and reactors for 48 years. Leading products are single-phase transformer, three-phase transformers, DC inductors, AC reactors, filtering reactor, expoxy resin high-voltage transformer and intermediate, high-frequency products. Our transformers and reactors are widely used in 10 application areas: rapid transit, construction machinery, renewable energy, intelligent manufacturing, medical equipment, coal mine explosion prevention , excitation system, vacuum sintering, central air conditioning.

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