Re: DC powered Coil single phase 14.4KV 5KVA pig DCPTC ?-)

["Tesla list" <tesla@xxxxxxxxxx>]

Original poster: "Paul Benham" <paulb@xxxxxxxxxxxxxxxxxxxx>

Hi Jim,

I am using 1/2 wave voltage doublers on 2 MOT's, and I used mains earth for
the 0V in the doublers.  Only the secondary is connected to RF earth,
everything else is on mains earth.  I used MOT caps in the doubler.  Output
is approx +-5kV or so, cantered at mains earth.  So far no problems.

Good luck,

Cheers,

Paul.

----- Original Message -----
From: "Tesla list" <tesla@xxxxxxxxxx>
To: <tesla@xxxxxxxxxx>
Sent: Wednesday, March 23, 2005 11:41 PM
Subject: DC powered Coil single phase 14.4KV 5KVA pig DCPTC ?-)


> Original poster: "Jim Mora" <jmora@xxxxxxxxxxx>
>
> Greeting All,
>
> I am considering building a full wave rectified and filtered DC supply to
> enjoy the perceived  luxury of have a variable speed RSG. Materials on
hand:
> 14.4KV @ 5KVA Pig, 250 amp arc welder ballast, Powerstat (1256d (0-280)
7500
> VA max) for power up. Proposed is to wire the Powerstat between the mains
> and the series ballast. I purchased (24) stackable 7500v 1.4amp diodes
from
> alltr. planning on stacking six per leg for the bridge. I plan to float
the
> Center tap and ground the transformer. I seem to remember varying opinions
> on whether this should be done to Mains or RF ground. I have a typical 8"
X
> 36" coil and numerous pulse capacitors but my present focus is on the
Power
> Supply. I don't plan on ever running past 500ma out. Open for discussion
are
> filter cokes, charging inductors, and of much concern Protection of the
> Bridge or it's robustness for that matter.
>
> I'm a signal level guy. For starters what is an appropriate filter
capacitor
> and suggested sources and should it be preceded by a filter choke? It
would
> seem that multiple smaller Caps would be safer then one big boomer. Please
> forward to the list if the thread would be of interest to the group.
>
> Thanks Much,
> Jim Mora
> Fillmore School District, Retired
> Ojai, Ca.
>
>