[Physltest] [Phys-L] Re: ISOLATION TRANSFORMER

[Brian Whatcott <betwys1@SBCGLOBAL.NET>]

At 06:04 AM 1/20/2005, you wrote:
> A 1:1 ratio power transformer with adequate insulation has the helpful
>  property that if one output line is accidentally grounded, there is no
> continuing current from that cause.
>
> Brian Whatcott    Altus OK    Eureka!
> -------------------------------------
>
> Brian, Why is there no current when shorted? Is there not still a voltage
> being induced in the secondary?
>
> Thanks for a few more details.
>
>     David Abineri
>
> --
> dabineri@fuse.net

An isolation transformer with a floating output winding develops a voltage
across
  the two output winding ends, but does not develop a sustainable voltage
from either
  wire to external references, because the output winding "floats", that is
to say,
has a voltage that is relative to any externally applied potential within
its insulation
limit.   Think of grounding one side of a dry cell: no current ensues.



Brian Whatcott    Altus OK    Eureka!
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