When does the temperature control of dry-type transformer us

Most dry-type transformers now use class H insulation. In general, the dry-type transformer is generally 130 °C alarm. When the transformer is running normally, the temperature controller is set up as follows: 80 °C AUTO-SHUT DOWN Fan, 100 °C AUTO-START FAN, 130 °C high temperature alarm, 150 °C ultra-high temperature trip.

National Standard GB 6450-1986 for dry-type transformer temperature control limit. COIL FOR DRY-TYPE TRANSFORMER: A. When grade a insulating material is used, the maximum temperature rise should be less than 60k when the limit working temperature is 105 °C. When grade e insulating materials are used, the maximum temperature rise should be less than 75k when the limit working temperature is 120 °C;. When Class B insulating materials are used, the maximum temperature rise should be less than 80k when the limit working temperature is 130 °C. When the Grade F insulating material is used, the maximum temperature rise should be less than 100k when the limit working temperature is 155 °C. When the Class H insulating material is used, the maximum temperature rise should be less than 125k when the limit working temperature is 180 °c; F. When Grade C insulating materials are used, the maximum temperature rise should be less than 150K when the limit working temperature is 220 °C. Under no circumstances shall there be a temperature at which the iron core itself, other parts or materials adjacent thereto may be damaged. Nowadays, most dry-type transformers are made of Class H insulation, so the temperature of dry-type transformers should be below 180 °C.