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Re: [Amps] HV transformer and Variac

To: <amps@contesting.com>, "Steve Bookout" <steve@nr4m.com>
Subject: Re: [Amps] HV transformer and Variac
From: "Jim W7RY" <w7ry@centurytel.net>
Reply-to: Jim W7RY <w7ry@centurytel.net>
Date: Wed, 22 Jul 2015 22:30:59 -0700
List-post: <amps@contesting.com">mailto:amps@contesting.com>
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@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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