[Prev][Next][Index][Thread]

Re: Blew my rolled cap....

Tesla List wrote:
> 
> Subscriber: chip-at-poodle.pupman-dot-com Tue Dec 31 23:08:37 1996
> Date: Tue, 31 Dec 1996 22:41:45 -0700 (MST)
> From: Chip Atkinson <chip-at-poodle.pupman-dot-com>
> To: Tesla List <tesla-at-poodle.pupman-dot-com>
> Subject: Blew my rolled cap....
> 
> Well, apologies to Ed Sonderman, I did finally blow my rolled cap.  I'm
> almost positive that the culprit was the high break rate.  I have run the
> thing for a couple years or more using static gaps, and recently a rotary.
> Tonight was the first time I fired the thing up with the high speed Carter
> motor.  It turns the disk at about 5000 rpm max, resulting in about 1000
> bps. Previous to that I had an induction motor that turned it at about
> 3600 rpm.
> 
> It was interesting to turn up the gap speed.  It directly corresponded to
> changes in the pitch of the coil whine.
> 
> Now I'm going to connect up the CP cap that I ordered a while ago.  I
> think I'll baby it for a while.  (At least 5 minutes!)
> 
> Question:  Is there anyone who has one of the custom CP caps who has used
> it without problem on 14400v or greater?  I'm paranoid about blowing it.
> 
> Chip
> 
> =-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-
>  Chip Atkinson
>  http://bhs.broo.k12.wv.us/homepage/chip/info.htm
>  --- Everyone is someone else's weirdo. ---
> =-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-

Chip:
	I have used one of the .025mfd. -at- 20,000 VAC Condenser Product caps
with no problem on my 8" dia secondary coil.  I use a Superior type
1256D variable transformer on the input side of my 14,400 VAC 10KW pole
pig.  Since we have high line voltage and the Superior variable is wired
for the voltage boost selection, I get 300 VAC output from it resulting
in around 18,000 VAC out of the pig.  The cap ran from July to October
and didn't blow with regular trips to the maximum output levels.  The
above voltage is under steady state conditions and obviously does not
include any variations caused by the inductive kick generated by the
current limiting welder.  My new cap will be ordered with a 30,000 VAC
rating, if I can justify the expense(read that, if his wife lets
him!!).  I really think, now looking back at this situation that maybe I
was very,very lucky I didn't pop the cap.  I'll do the same thing again
though when it warms up and I start firing the coil again.  As was
mentioned by others, I do miss the smell of ozone!

Chuck