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Transformer Efficiency

Lecture



Efficiency is determined by the power ratio Transformer Efficiency given by the transformer to the load, to the power Transformer Efficiency Consuming *** from the network:
Transformer Efficiency .
Efficiency characterizes the efficiency of voltage conversion in a transformer. In practical calculations, h is calculated by the formula
Transformer Efficiency , (20)
Where Transformer Efficiency - total loss in the transformer.
Formula (20) is less sensitive to errors in determining Transformer Efficiency and Transformer Efficiency and therefore allows us to obtain a more accurate value of h. Net power is calculated by the formula
Transformer Efficiency , (21)
Where Transformer Efficiency - the load factor of the transformer.
The electrical losses in the windings are determined from short circuit experience.
Transformer Efficiency , (22)
Where Transformer Efficiency - loss of short circuit at rated current.
Losses in steel Transformer Efficiency determined by the experience of idling
Transformer Efficiency . (23)
They are assumed to be constant for all operating modes of the transformer, since Transformer Efficiency Emf Transformer Efficiency in operating mode changes slightly.
Substituting relations (21) - (23) into formula (20), we obtain
Transformer Efficiency . (24)


Transformer Efficiency

Analysis of this expression shows that h has a maximum value under load, when the losses in the windings are equal to the losses in steel,
Transformer Efficiency .
From here we get the optimal value of the load factor.
Transformer Efficiency .
In modern power transformers, the loss ratio Transformer Efficiency therefore, the maximum h occurs at Transformer Efficiency (Fig.21).
Out of the curve Transformer Efficiency It can be seen that the transformer has almost constant efficiency in a wide range of load variation from 0.5 to 1.0. At low loads, the sharp transformer h decreases.


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Power supplies for electronic equipment

Terms: Power supplies for electronic equipment