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The difference between isolation and regular transformer

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electronicman

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Isolation transformer?

Hi,I want to know the difference between the regular transformer which has primary and secondary .Why we use this type of transformer and for what.
 

Isolation transformer?

An isolation transformer is an ordinary transformer with primary and secondary windings. It usually has an equal number of turns on both windings so the input-output voltages are equal. Such transformers are commonly used on the AC mains to isolate (with very high resistance) an instrument from the power source.

Another description:
https://en.wikipedia.org/wiki/Isolation_transformer
 

Re: Isolation transformer?

Another kind of isolation transformer is audio isolation transformer. It is 1:1 in most cases. Using isolation transformer enables the secondary circuit to be galvanically isolated from the primary circuit. Actually any kind of transformer does this.
 

Isolation transformer?

isolation transformer usually has an equal number of turns on both windings so the input-output voltages are equal. Such transformers are commonly used on the AC mains to isolate the actual ckt
from the power source.
 

Re: Isolation transformer?

Every type of transformer provide galvanic isolation between the primary and the secondary.
 

Re: Isolation transformer?

electronicman,
Some isolation transformers hava a "Faraday shield", which is just a metal foil that is inserted between the primary and secondary. This shield, which must be grounded, greatly reduces the capacitive coupling between the primary and secondary.
Regards,
Kral
 

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