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@n8zfm.com>
To: "Amps" <amps@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/
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