Step down transformer can used as a step up transformer?

if the step down transformer can be used as a step up transformer? if not why? if yes why?
Asked Jan 08, 2013
In basic transformer theory, you can. Whether a transformer steps the voltage up or down depends on the windings in the primary and secondary. If you reverse the input and output with the primary and secondary, it will function in the reverse way.

That's theory. In real life, transformers have current ratings. If the swap changes the amount of current or if it's an isolation transformer, the reversal may not work and could damage the transformer or connected components..
Answered Jan 08, 2013
Yes, we can use a step-down transformer as a step-up transformer. For doing this we have to change the winding of the transformer means replace secondary winding as a primary winding and primary winding as the secondary winding.

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Answered Jun 18, 2021
--Based on of Transformer's Utility:
Step-Down Transformers and Step-Up Transformers are two major types that classify them based on their utility. The first one is used to step down the voltage to the desired amount, and the latter one for stepping it up according to the device requirements. They both have distinct needs based on their specific applications, and one needs to choose the one that fits into their work well.

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Answered Jul 01, 2021
Edited Jul 01, 2021
Yes you can do it but need to exercise some precaution: The LV winding that was intended by design to be the secondary winding, will serves as the primary & the value of the magnetizing inrush current actually will be greater than expected.

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