Re: Any Interest in 30-40 kVA Power Supplies (fwd)

[<sroys@xxxxxxxxxxxxxxxxx>]

---------- Forwarded message ----------
Date: Tue, 05 Oct 2004 09:47:06 -0500
From: Bert Hickman <bert.hickman@xxxxxxxxxx>
To: High Voltage list <hvlist@xxxxxxxxxx>
Subject: Re: Any Interest in 30-40 kVA Power Supplies (fwd)

High Voltage list wrote:
> Original poster: sroys@xxxxxxxxxxxxxxxxx
> 
> 
> 
> ---------- Forwarded message ----------
> Date: Tue, 5 Oct 2004 07:09:37 -0600
> From: Gomez Addams <gomez@xxxxxxxxxxxx>
> To: High Voltage list <hvlist@xxxxxxxxxx>
> Subject: Re: Any Interest in 30-40 kVA Power Supplies (fwd)
> 
> 
> On Oct 4, 2004, at 8:43 PM, High Voltage list wrote:
> 
> 
>>Original poster: <sroys@xxxxxxxxxxxxxxxxx>
>>
>>
>>
>>---------- Forwarded message ----------
>>Date: Mon, 04 Oct 2004 11:02:21 -0700 (PDT)
>>From: Peter Lawrence <Peter.Lawrence@xxxxxxx>
>>To: hvlist@xxxxxxxxxx
>>Subject: Re: Any Interest in 30-40 kVA Power Supplies (fwd)
>>
>>Carl,
>>     what you have here is "the mother of all coin shrinker" 
>>capacitors,
>>
>>Joules = 1/2 * C * (V)**2,   so if my math is correct:
>>
>>	1/2 * (2 * 10**-6) * (125,000)**2   =>   15,625 Joules
>>
>>do the web search yourself, but IIRC it takes 4000 to 8000 Joules to 
>>shrink
>>a quarter.
> 
> 
> Except that these caps may not be designed for fast, very high current 
> discharges.
> 
> [Optimally ;-)  And yes, XRay filter caps aren't likely to be ultra-low
> inductance pulse caps.  But I imagine that if you whack anything with
> 15kJ, somethings going to give.  A capacitance of 2uF seems a bit
> large for a coil though, and the cable will have it's own, not
> insubstantial, capacity to add as well.  SRR]
> 
> 
> 
> 
> .
> 

Yep.

But applying 125 kV across a typical 1" x 1" 10-turn work coil would 
be a bit of a challenge. For magnet wire, the upper flashover limit is 
~40-45 kV (per fellow "shrinkers" in Texas). But a flashover followed 
by a 15 kJ capacitor explosion could be very exciting... :^)

-- Bert --
-- 
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