Re: 500 KV DC (fwd)

[<sroys@xxxxxxxxxxxxxxxxx>]

---------- Forwarded message ----------
Date: Wed, 22 Sep 2004 23:19:50 +0800
From: Peter Terren <pterren@xxxxxxxxxxxx>
To: High Voltage list <hvlist@xxxxxxxxxx>
Subject: Re: 500 KV  DC (fwd)

Keep the iron core.  You will need a hefty ballast transformer in series 
with the primary though
Try a 2 stage Marx generator if pulsed DC is OK or a 2 stage CW multiplier 
if continuous is required..
Don't forget that you need about 6 times the AC rating for a single diode 
and capacitor ie 250 kVx 6 = 1.5 MV = 70 x 20 kV diodes.   I hope you have 6 
dozen... for just the first stage.  You will need a series resistor to limit 
the peak currents if you want to make sparks .  No mean feat with discrete 
resistors or you could use water resistors.

Peter
http://tesladownunder.iinet.net.au/Other_HV_stuff.htm#100kV

> From: Colin Quinney <crquin@xxxxxxxxxx>
> I have on hand an old 250 KV  60 Hz  X-ray transformer. It was 
> manufactured
> with three windings connected in series and it  was designed to be run in
> dielectric oil. I can remove the iron laminate core if necessary to run it
> at higher frequency, but maximum output power is not a critical factor for
> what I require,  and that is variable DC to 500 KV. Filtering not 
> required.
>
> I'm looking for ideas for best method of doubling to 500 KV while
> minimizing complex solid state design. I have a 1 KV Variac, dozens of 20
> KV diodes, enough for a full wave bridge if necessary. High power output 
> is
> not required.
> Safety is top priority. Wire netting for Faraday cage has been purchased.
> Colin Quinney