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

[<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.


-Pete Lawrence.





> 
>ALSO, another question has arisen.  One of the power supplies was for a large 
'mobile' x-ray unit that actually
>operated from a large storgage capacitor rather than a power tranformer.  
Through the action of a 'modest'
>(relatively) transformer about the size of a big MOT (240VAC in and 10,000VAC 
out) the capacitor charges to 125,000
>volts and stores 2 uF at that voltage.  The capacitor is about 24" cubic and 
weighs 176 pounds!  It is divided into
>2 halves (seperate cans) and each one has 3 terminals.  Both cans have 2 small 
terminals labeled AC and E.  Then,
>each has a huge terminal with large glass insulator that reads H+ on one and H- 
on another.  Fully charged, the
>potential on one is +62.5 kVDC and on the other it is -62.5 kVDC

> 
> 
>Carl Litton
>Home 901-377-4973
>Work  901-374-5747
>
>
>