Re: Unknown type of HV capacitor

["Jim Lux" <jimlux-at-jpl.nasa.gov> (by way of Terry Fritz <twftesla-at-uswest-dot-net>)]

Fairly bulky for a DC filter cap, but the voltage is high.  Let's see..
stored energy is good way to evaluate it.. 0.3 uF at 60 kV is 540 Joules,
in a can about 1/2 cubic foot.  It just might be a pulse cap... They tend
to run in that sort of energy density.  

If you can somehow measure the L and R... A square wave generator of a few
kHz (say a TTL pulse generator or a 555), a series resistor and an
oscilloscope will tell you... Measure the ringing frequency and the
decrement ratio...  If the L is down in the nanohenries, and fRes is in the
hundreds of kHz, you might be in luck.

----------
> From: Tesla list <tesla-at-pupman-dot-com>
> To: tesla-at-pupman-dot-com
> Subject: Unknown type of HV capacitor
> Date: Monday, August 28, 2000 10:12 PM
> 
> Original poster: "John Sanderson" <john.sanderson-at-eng.monash.edu.au> 
> 
> Dear fellow coilers,
> 
> I recently obtained a pair of HV capacitors and I have no idea about
> their intended application, or whether or not they would be suitable
> for a TC tank circuit.  (My initial feeling is "not".)  But maybe
> someone on this list has come across these before, and can give me a
> definite yes or no.  The details of these caps are:
> 
> Manufacturer:
> Sprague
> Nameplate details:
> 0.3 microfarad
> 50kV DC -at- 85 degrees C
> 62.5kV DC -at- 40 degrees C
> Model number:
> 269 P223
> 
> The capacitor cases are 345mm long, 330mm high and 130mm wide.  The HV
> terminals stand 205mm high above the top of the case. They must be at
> least 20 years old.   If anyone on the list knows these beasts,
> please let me knowa
> 
> John.
> **********************************
> John Sanderson
> Fluidization Group
> Department of Chemical Engineering
> P.O. Box 36
> Monash University
> Vic.  3800
> ph (03) 9905 1482
> fax (03) 9905 5686
> john.sanderson-at-eng.monash.edu.au
> **********************************
> 
> 
>