isolation transformer

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domnic

Senior Member
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Electrical Contractor
Where can I find wiring diagram for isolation transformer versus regular transformer and is there any difference in the internal windings of the transformer? Also, can I use a regular transformer as a isolation transformer?
 
Re: isolation transformer

I'm not the electronics expert, but I thought that any 1:1 transformer (sized to the proper kva for the load) is the same thing as an "isolation transformer". You'd wire them the same as any other transformer, except that there's really no defined primary or secondary. You can wire it in either "direction".
 
Re: isolation transformer

Typically an isolation transformer is just a transformer with 1 to 1 windings.

120 volt in 120 volt out etc.

If you use a standard transformer you will end up changing voltage as well as isolation. This may or may not be a bad thing.
 
Re: isolation transformer

Technically there is no difference. Isolation transformers usually have a shield to minimize capacitive coupling between primary and secondary to further reduce common mode noise transformation, but wiring wise there is no difference.
 
Re: isolation transformer

IWIRE. if i use 2 to 1 transformer can it be a isolation transformer.also is their a safty factor with a isolation transformer.
 
Re: isolation transformer

domnic - A regular old xfmr (regardless of transformation ratio) is actually an isolation xfmr because the pri. & sec. are not connected to each other electrically. Pri. & sec. are linked magnetically.

The sec. of a regular old xfmr can be thought of as a "new electrical system" - maybe the term "separately derived" would be to your liking.

An autoxfmr, buck/boost, etc. is not a plain old xfmr.

In the world of marketing, the term "isolation xfmr" is frequentally used to mean an xfmr that also has some shielding, etc., added.
 
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