RE: MMC or Maxwell? Which is better (Condensor Products)?

["Tesla list" <tesla-at-pupman-dot-com>]

Original poster: Terry Fritz <teslalist-at-twfpowerelectronics-dot-com>

Hi,

Chips caps were not solidly strapped together.  The ends of the packs were 
just pressed together I think with a spring.  The press contact in oil 
seemed to be where it all went bad.  I hear they replaced many under 
warranty and even said there was a problem, but I don't know if they ever 
confirmed what it exactly was.  Not to blame CP, they did everything they 
could to make it right...  With an NST system and much lower peak and RMS 
currents, I think they would have done just fine.  It is very possible they 
were not aware of the peak and RMS currents needed in pig systems when they 
made the caps and thus made them too weak...

Cheers,

         Terry


At 10:29 PM 2/28/2004, you wrote:
>Hi Terry, what do you mean by "casually" connected together? I
>understand that they (at least mine) were made of 6 series caps. Oh and
>Ed if you read this, make sure that you roll the cap every month (before
>using it) or so to prevent "drying" of the dielectric due to an air
>bubble.
>
>No need to get rid of those commercial caps, just use them as designed.
>And when they go, build a MMC!
>
>Regards,
>
>David Trimmell
>
>-----Original Message-----
>From: Tesla list [mailto:tesla-at-pupman-dot-com]
>Sent: Saturday, February 28, 2004 8:39 PM
>To: tesla-at-pupman-dot-com
>Subject: RE: MMC or Maxwell? Which is better?
>
>Original poster: Terry Fritz <teslalist-at-twfpowerelectronics-dot-com>
>
>Hi,
>
>I saw one of Chips blown caps that I "think" was involved in all this.
>The
>caps had several sections that were connected together "casually" so RMS
>
>current and peak currents were the problems.  In a mild NST system, they
>
>may very well do just fine.  Chip blew his with a pig system and a gap
>with
>a ton of points and a 10,000 RPM motor....  I would think and NST system
>
>would have a hard time blowing one.
>
>Cheers,
>
>          Terry
>
>
>At 07:34 PM 2/28/2004, you wrote:
> >Ed, that sounds just like one of the CP caps. I bought the 15KV one
> >because I could only afford the $160 for it at the time. My experience
> >has been good. But I would be interested to know if others had failures
> >while running in a sensible Neon system? I would say use it! Like I
> >said, the Geek MMC caps are great, but no need to feel you shouldn't
>use
> >your existing Condenser Products cap that was also designed to be used
> >in sensible static gaps coil.
> >
> >Regards,
> >
> >David Trimmell
> >
> >-----Original Message-----
> >From: Tesla list [mailto:tesla-at-pupman-dot-com]
> >Sent: Saturday, February 28, 2004 5:26 PM
> >To: tesla-at-pupman-dot-com
> >Subject: Re: MMC or Maxwell? Which is better?
> >
> >Original poster: Ed Phillips <evp-at-pacbell-dot-net>
> >
> >"Ed, all, IF you are talking about the CP caps, then I have one, a
> >.02uF-at-15KV, that has had many hours of use*. Condenser Products never
> >intended (designed) this series of caps for >120 PPS (static gap).
> >Failures were mostly on Pig coils >120PPS. Please correct me if I am
> >wrong. MMC's are great, but the CP caps got a bad rap in my opinion. I
> >talked to one of their engineers about this, and he was sure that on
> >NEON systems with STATIC gaps the caps should do very well...
> >Unfortunately they only mentioned the 120PPS thing that was not
> >followed...
> >
> >David Trimmell"
> >
> >         I just went looking for the ones I have but there's been too
> >much stuff
> >piled into my attic since the last time I saw them.  I thought that
>they
> >were 0.025, 20 kV, but guess memory is short these days.  My only
> >interest was in using them with NST's (no interest in bigger and better
> >things) and have always used both a fixed gap and a safety gap.
> >
> >         Sounds as if you feel these are OK under such circumstances?
> >
> >Ed