RE: MMC bleed resistors

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

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

Hi Tristan,

Back in the wild days of the MMC's beginning, oil immersion was 
considered....  But it is not needed at all.  The caps will do fine in 
air.  Also, oil may attack the cap's plastics and destroy them!!  I know of 
no reason to consider oil immersion...

Your inexpensive caps sound great!!  But usually there is a catch...  We 
seem to need the best highest tech caps available for our super hard use in 
Tesla coils.  but at that price, why not try ;-))

Cheers,

         Terry


At 06:03 PM 3/12/2004, you wrote:
>Would there be any advantage in submerging the capacitor strings in mineral
>oil?  I was looking at using about 150 capacitors in an undecided
>arrangement with a 15Kv NST.  Most likely driving either a 4" of 6" coil.  I
>had found a source for 4700pF ceramics -at- 3kV for AU$0.19 each, thereby
>making them a cheaper option then the Geek Group options.
>
>Tristan
>
>-----Original Message-----
>From: Tesla list [mailto:tesla-at-pupman-dot-com]
>Sent: Saturday, 13 March 2004 9:46
>To: tesla-at-pupman-dot-com
>Subject: Re: MMC bleed resistors
>
>Original poster: "Harold Weiss" <hweiss-at-new.rr-dot-com>
>
>Hi Tristan,
>
>I tried it with 7.5 and 15KV ceramic disk caps.  The caps would melt the
>paraffin out and then explode with a flash leaving just the two wires.  I
>then went to 1 gallon cider jugs with a lot better results.  If your going
>to go with an MMC, stick with the 942's or equivalent.
>
>But then again if you have LOTS of em, lots of parallel strings might get
>the current down to manageable levels, and prevent their destruction.
>However, corona losses could be too high to prevent it from being useful.
>If you have a ton of them taking up space, try it, and see what happens.
>Either way you can have the fun of watching them pop like little
>firecrackers or the fun of getting streamers off your coil, or both.
>
>David E Weiss
>
>  > Original poster: "Tristan Steele" <tsteele-at-westnet-dot-com.au>
>  >
>  > Secondly, Is it possible to make a MMC using LOTS of Ceramic Capacitors
>(ie
>  > 4700pF 3kV)?
>  >
>  > Many Thanks
>  > Tristan