Re: Bleed resistors for MMC caps

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

Original poster: robert heidlebaugh <rheidlebaugh-at-desertgate-dot-com> 

The main problem is no single relay can discharge a MMC capacitor string
without blead resistors installed. Any DC charge held within a series
capasitor string can not be discharged without a DC path. Though AC is
applied to the capacitors the last cycle of the AC leaves a + or - DC charge
on the series string.
    Robert   H
-- 


 > From: "Tesla list" <tesla-at-pupman-dot-com>
 > Date: Mon, 07 Jun 2004 18:27:59 -0600
 > To: tesla-at-pupman-dot-com
 > Subject: Re: Bleed resistors for MMC caps
 > Resent-From: tesla-at-pupman-dot-com
 > Resent-Date: Mon, 7 Jun 2004 18:39:00 -0600
 >
 > Original poster: Tom Wideman <twidem01-at-baker.edu>
 >
 > Instead of using some sort of bleed resistor....could you
 > use a normaly closed contact off a solid relay?  So that
 > when the circuit is off the relay redirects all gathered
 > electrons to ground? Just a thought....tell me what you
 > think.
 >
 > -Nano2e
 >
 > ---- Original message ----
 >> Date: Mon, 07 Jun 2004 07:27:51 -0600
 >> From: "Tesla list" <tesla-at-pupman-dot-com>
 >> Subject: Re: Bleed resistors for MMC caps
 >> To: tesla-at-pupman-dot-com
 >>
 >> Original poster: "claude masetto"
 > <claudmas-at-optusnet-dot-com.au>
 >>
 >> I've always used normal 1M  1 watt resistors with no
 > problems.
 >>
 >> Claude.
 >> ----- Original Message -----
 >> From: "Tesla list" <tesla-at-pupman-dot-com>
 >> To: <tesla-at-pupman-dot-com>
 >> Sent: Monday, June 07, 2004 3:07 AM
 >> Subject: RE: Bleed resistors for MMC caps
 >>
 >>
 >>> Original poster: "Tristan Steele"
 > <ozonejunkie-at-westnet-dot-com.au>
 >>>
 >>> Hi There,
 >>>
 >>>
 >>> I know that here in Australia, RS Components sell HV
 > Resistors for AU
 >>> 64c each.  I believe that they are a multinational
 > company, and do exist
 >>> in the USA.  These resistors are rated to 3500VDC, more
 > then the
 >>> 942C20P15K's.  It may be worthwhile looking into them,
 > because 3
 >>> resistors per cap is messy, but all increases the chance
 > of a failure.
 >>>
 >>> Try http://www.rs-components-dot-com/index.html.
 >>>
 >>>
 >>> Good Luck
 >>> Tristan
 >>>
 >>> -----Original Message-----
 >>> From: Tesla list [mailto:tesla-at-pupman-dot-com]
 >>> Sent: Saturday, June 05, 2004 10:30 AM
 >>> To: tesla-at-pupman-dot-com
 >>> Subject: Bleed resistors for MMC caps
 >>>
 >>> Original poster: Chris Cudahy <ccudahy-at-yahoo-dot-com>
 >>>
 >>>
 >>> I'm collecting parts for an MMC cap. I've going with
 >>> 942C20P15K's for the caps but I'm not sure what to use
 >>> for bypass resistors. The 1/2 watt 10M ohm seems to be
 >>> reasonable but I can't find a resistor rated for 2000
 >>> volts - 350normal/700max is the most I can find.
 >>> Which leaves me with 2 options:
 >>>
 >>> a) Wire up 3 3.3M Ohm resistors in series across each
 >>> cap. Hit just under the max overload voltage of 2100V
 >>> combined.
 >>>
 >>> b) Wire one 10M Ohm resistor,  (someone has mentioned
 >>> 10MH-ND) and wait for smoke.
 >>>
 >>> I'd rather not have to wire 3 resistors to each cap,
 >>> has anyone had any failures with option b?
 >>>
 >>> (BTW, what the heck is the point of making a 0.5 watt
 >>> resistor in 10M ohm if it's limited to 0.12 watts by
 >>> it's working voltage?)
 >>>
 >>> Chris
 >>>
 >>>
 >>>
 >>
 >>
 >
 >