What is double wond transformer

[urjaengrs]

Please let me know the difference between double wounfd and single wound transformer?

In anticipation, thanks...

 

[ScottyUK]

Double wound = two galvanically isolated windings.
Single wound = one winding, i.e. an autotransformer.


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If we learn from our mistakes I'm getting a great education!

 

[urjaengrs]

Thanks scotty,

Why normally this term is used for isolation transformer? Is there any constructional difference netween normal distribution transformer and isolation transformer?

Thanks in anticipation of replies

 

[waross]

Hi Scotty.
Do you see this term mostly applied to CTs or is that just me.
Some classes of isolation transformers have a grounded screen between the primary winding and the secondary winding. This is a code requirement for some transformers used for isolation in medical environments. It is for added safety and does not affect the transformer action.
The screen prevents primary voltage transients from being capacitively coupled to the secondary winding.
In many power applications a normal power transformer may be used for isolation.

Bill
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"Why not the best?"
Jimmy Carter