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Dry-type transformer temperature standard
Dry-type transformer temperature standard
Classification:News Time: 2020-11-11 11:38
【Summary】Dry-type transformers are widely used in local lighting, high-rise buildings, airports, terminal CNC machinery equipment and other places. Simply put, dry-type transformers refer to transformers whose cores and windings are not immersed in insulating oil. Cooling methods are divided into natural air cooling (AN) and forced air cooling (AF). When natural air cooling, the transformer can run continuously for a long time under the rated capacity. When forced air cooling, the output capacity of the transformer can be increased by 50%. It is suitable for intermittent overload operation or emergency accident overload operation; due to the large increase in load loss and impedance voltage during overload, it is in a non-economic operation state, so it should not be kept in continuous overload operation for a long time.

Dry-type transformer

  Dry-type transformers are widely used in local lighting, high-rise buildings, airports, terminal CNC machinery equipment and other places. Simply put, dry-type transformers refer to transformers whose cores and windings are not immersed in insulating oil. Cooling methods are divided into natural air cooling (AN) and forced air cooling (AF). When natural air cooling, the transformer can run continuously for a long time under the rated capacity. When forced air cooling, the output capacity of the transformer can be increased by 50%. It is suitable for intermittent overload operation or emergency accident overload operation; due to the large increase in load loss and impedance voltage during overload, it is in a non-economic operation state, so it should not be kept in continuous overload operation for a long time.

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  Dry-type transformer temperature standard

 

The national standard "Dry-type Transformer" GB6450-1986 specifies the temperature rise limit of dry-type transformers.

   One, to the coil of dry-type transformer

   1. Most dry-type transformers now use Class H insulating materials, so generally the temperature of dry-type transformers should be below 180°C.

  2. When using Class A insulating materials, the temperature rise should be less than 60K when the working temperature is 105°C; when using Class E insulating materials, the temperature rise should be less than 75K when the working temperature is 120°C;

  3. When using Class B insulating materials, the temperature rise should be less than 80K when the operating temperature is 130°C;

  4. When using Class C insulating materials, the temperature rise should be less than 150K when the working temperature is 220℃.

  5. When using class F insulating materials, the temperature rise should be less than 100K when the working temperature is 155℃;

  6. ​​When H-class insulating materials are used, the temperature rise should be less than 125K when the operating temperature is 180°C.

  Second, the iron core, metal parts and materials adjacent to it, under any circumstances, shall not have a temperature that would damage the iron core itself, other parts or materials adjacent to it. Most dry-type transformers now use Class H insulating materials, so generally the temperature of dry-type transformers should be below 180°C.

  How much does the dry-type transformer temperature alarm?

  Dry-type transformers generally alarm at 130°C.

   Now most of the dry-type transformers use Class H insulating materials. Under normal circumstances, the temperature controller control settings during normal operation of the transformer: 80℃ automatically turn off the fan, 100℃ automatically turn on the fan, 130℃ high temperature alarm, over 150℃ high temperature trip.

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