[Amps] HV transformer and Variac

[Steve Bookout]

Hello all,

Thanks to everyone for the informative responses.  Although I've now got 
more info to use in order to figure out what I am going to do, I'm not 
sure what that will be.

It's really just a bit 'hot' for my needs and if I turn it down with a 
variac, regulation may suffer.  I do have a stack of two variacs on a 
common shaft, and although they are large, I don't know what their 
actual specs are.  Something for me to check.

73 de Steve, NR4M

On 7/21/2015 03:03 , Steve Bookout wrote:
> Hello all.
>
> Question for the experts.
>
> How does using a Variac to control the output of a HV transformer 
> affect things like efficiency?
>
> I think it would be reasonable to think that a transformer operated at 
> less than rated input voltage would be less efficient than one run at 
> full primary voltage.  I mean, it cost 'something' just to make a 
> transformer act like a transformer.
>
> I ask because I have a perfectly fine 'pole pig' transformer rated at 
> 5 KVA.  7200 AC volts on the output (reversed) is a bit much for my 
> needs, so was wondering what the trade-off would be if it were run at 
> considerably less than 220 input.
>
> I can see this is a better xformer for a 4cx10000, than anything I 
> would be using, but I have what I have.
>
> 73 de Steve, NR4M
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