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Re: suitable bleeder resistors for MMC



Original poster: "Malcolm Watts by way of Terry Fritz <twftesla-at-qwest-dot-net>" <m.j.watts-at-massey.ac.nz>

Hi Allan,

On 1 Mar 2002, at 8:10, Tesla list wrote:

> Original poster: "Allanh by way of Terry Fritz <twftesla-at-qwest-dot-net>"
<allanh-at-starband-dot-net>
> 
> Hi Malcolm,
> 
> I am using 2.7 Meg ohm 4 watt resistors that are very cheap but since they
> can handle over 10 times the power
> expected, and are 1.5 inches long, they should work well. I bought them from
> Antique Radio supply, in Tempe, Arz.  When I run my TC for 10 minutes, the
> resistors aren't even warm.
> 
> allan

Fair enough, but I'd say you are using a sledgehammer to crack a nut. 
Why waste power in resistors?

Regards,
Malcolm
 
> ----- Original Message -----
> From: "Tesla list" <tesla-at-pupman-dot-com>
> To: <tesla-at-pupman-dot-com>
> Sent: Thursday, February 28, 2002 6:16 PM
> Subject: Re: suitable bleeder resistors for MMC
> 
> 
> > Original poster: "Ed Phillips by way of Terry Fritz <twftesla-at-qwest-dot-net>"
> <evp-at-pacbell-dot-net>
> >
> > > The DC voltage rating Must be applied in conjunction with the power
> > > rating for these. e.g. If you run 3.5kV continuously across a 10MOhm
> > > resistor, its dissipation will exceed 1W. You will therefore be
> > > violating one of the specifications.
> > >      For a large number of reasons, I recommend going to 33MOhm or
> > > higher. There is no particular benefit in choosing 10MOhms and there
> > > can be some drawbacks as I mentioned previously.
> > >
> > > Regards,
> > > malcolm
> >
> > At those prices, putting three in series would seem preferable, for the
> > extra margin of safety.  Depending on the lead spacing of the
> > capacitors, three in series might fit pretty well if arranged in a
> > straight line.
> >
> > Ed
> >
> >
> >
> 
> 
> 
>