Dry type transformer heating
Calorific value calculation of dry-type transformer
The heating capacity of dry type transformers is based on no-load loss+load loss
No-load loss: When the secondary winding of a dry-type transformer is open circuit and the primary winding is subjected to a rated voltage with a sinusoidal waveform of rated frequency, the active power consumed is called no-load loss.
Load loss: can change the loss. It is proportional to the square of the current passing through. Load loss refers to the load loss at rated current and reference temperature. To expand on, the so-called rated current refers to that the primary side tapping position must be the main tapping position, and cannot be the rated current of other tapping positions. For the reference temperature, it depends on the heat resistance level of the insulation material of the dry type transformer. For dry type transformers, whether they are self cooled, air-cooled, or forced oil air-cooled, they are all Class A insulation materials, and their reference temperature is specified according to traditional concepts, all of which are 75 ℃.
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