Are same transformer be employed for step up and step down
services?

Answer Posted / iamdon

Strictly speaking No.

Most transformers rated above 3kVA can be used either as
step up or as step down depending upon the need.

But transformers rated below 2kVA can be used only for one
operation for which it is designed.It can not be employed
in revese(with respect to design) transformation,because
the winding used is compensated which will not work
satisfactorily in reverse.

Author:arbelectbit@yahoo.com

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