[Amps] HV transformer and Variac
Jim W7RY
w7ry at centurytel.net
Thu Jul 23 01:30:59 EDT 2015
Buy a 3KVA transformer from Heybour for $500.00 and be done with it. Small,
compact, and it will work better.
73
Jim W7RY
-----Original Message-----
From: Steve Bookout
Sent: Wednesday, July 22, 2015 6:28 PM
To: amps at contesting.com
Subject: Re: [Amps] HV transformer and Variac
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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