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Technical Notes

 
Guide To Transformers - Operating Frequency
 
The operating frequency determines the transformer size and weight for a given output power-higher frequency generally means a smaller transformer. 

A transformer designed for 60 Hz operation only will therefore be smaller and lighter than one designed for 50/60 Hz operation, though this size reduction will not be considerable for a difference of only 10 Hz. However, a transformer for 400 Hz operation may be up to 80% smaller than a 50/60 Hz transformer. It is important to specify the minimum expected operating frequency of transformers, as operation is possible above the designed frequency but not below.
 

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