[Amps] Large Variac controlling HV power supply

[Mark Beckwith]

I think guys have been doing this since time began.  I have two different 
boat anchors out in the barn built exactly as you describe, both built by 
other people (one is a bona-fide Henry industrial something-or-other).  I 
assumed it was "best practice."

73,
Mark - N5OT


----- Original Message ----- 
From: "Dave Trainor" <dave at n8zfm.com>
To: "Amps" <amps at contesting.com>
Sent: Wednesday, October 30, 2013 2:52 PM
Subject: [Amps] Large Variac controlling HV power supply


> Is there any disadvantage (other than size) in utilizing a large 30 amp 
> variac to supply the line voltage to the HV transformer in a power supply? 
> I have a 5000V 3A transformer that came from an industrial induction 
> heater, and the variac from the same to control the voltage. Now both of 
> these are large, but considering a floor roll around unit for the power 
> supply and building the variac into the top with its steering wheel 
> control.  Since I have both the cost is small but is there a disadvantage 
> to doing this power wise? I expect at the current draw for legal limit I 
> should see no voltage sag at all at 3000v since the cycle dyne induction 
> heater the transformer came from was a 10kW unit CCS of course.
>
> Thanks,
> David Trainor - N8ZFM
>
>
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