[Amps] Large Variac controlling HV power supply

[Vic K2VCO]

If anyone is interested, I have a 5 kVA variac (input 120 - 0 - 230, output 0 - 250) 
sitting here that is free if someone wants to pick it up in Fresno. If I have to ship it, 
I will sell it for $75 plus actual packing and shipping cost. It won't be cheap! I can 
barely pick it up. It is in good shape except the spokes of the knob are broken off.

On 10/31/2013 5:26 AM, Mark Beckwith wrote:
> 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

-- 
Vic, K2VCO
Fresno CA
http://www.qsl.net/k2vco/