Re: MMC resister problem

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

Original poster: "Jim Lux by way of Terry Fritz <twftesla-at-qwest-dot-net>" <jimlux-at-earthlink-dot-net>

Exactly... the breakdown voltage along the surface of the resistor is
probably around 10kV/cm (or realistically, half that..)

If they are little tiny 1/4 W resistors, they might break down across the
surface around 5kV...

Just put a bunch of resistors n series...


----- Original Message -----
From: "Tesla list" <tesla-at-pupman-dot-com>
To: <tesla-at-pupman-dot-com>
Sent: Sunday, June 02, 2002 11:31 AM
Subject: MMC resister problem


> Original poster: "Steven Ward by way of Terry Fritz <twftesla-at-qwest-dot-net>"
<srward16-at-hotmail-dot-com>
>
> Hi everyone,
>
> My friends large coil project has been having problems with the cap and im
> hoping someone could give me an answer.  Here are the specs for his MMC
cap:
>
> caps are green Russian military caps.  .0047uf-at- 16kvdc each.  We wired
them
> into strings of 3 in series, with 30 strings in parallel.  Thats a lot of
> caps!!
>
> Now we only have a single 10meg ohm resister across each cap, and the
> problem is that these cheap radioshack resisters are starting to arc
between
> the leads.  I have a feeling that its because 1) they are not rated for HV
> and 2) we only have 3 caps in series, so its alot easier for it to arc
> across 3 resisters, rather than the 7-10 that a normal MMC would have.
>
> So...  would i be able to fix this by putting 2 resisters across each
cap??
> or would we need more like 3 on each cap?
>
> Any other suggestions are welcome.
>
> Steve Ward.
>
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