Henan New Electric Power Co.,Ltd.

Henan New Electric Power Co.,Ltd.

What is the normal operating temperature of dry-type transformer

2023 02/07

The insulation and heat resistance of dry-type transformers are usually Class F and Class H.
For dry-type transformers with Class F insulation, the temperature of the hottest point of the winding shall not exceed 155 ℃.
For dry-type transformers with Class H insulation, the temperature of the hottest point of the winding shall not exceed 180 ℃.

Most dry-type transformers now use Class H insulation materials, so the temperature of dry-type transformers should generally be below 180 ℃. 2. When Class A insulation materials are used, the maximum temperature rise should be less than 60K when the limit working temperature is 105 ℃; When Class E insulation material is used, the maximum temperature rise shall be less than 75 when the limit working temperature is 120 ℃

Step Down Cast Resin