Re: MMC resister problem

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

Original poster: "david baehr by way of Terry Fritz <twftesla-at-qwest-dot-net>" <dfb25-at-hotmail-dot-com>


I think some of the large commercial made caps use many' packs' of caps in
series inside them........do they put resistors on each pack in these
caps???????

>From: "Tesla list" 
>To: tesla-at-pupman-dot-com 
>Subject: Re: MMC resister problem 
>Date: Mon, 03 Jun 2002 11:09:59 -0600 
> 
>Original poster: "Justin Hays by way of Terry Fritz " 
> 
>Hi All, 
> 
>(snip from Jim Lux) 
> > A single resistor across a series combination of capacitors does 
> > not provide a safe bleeder function. It is entirely possible that 
> > there may be significant charge on the capacitors. "Gedanken 
> > Experiment": two capacitors, equal values, charged to 1kV. Hook 
> > them in series, with polarities opposite. Voltage across series 
> > string is zero volts, so putting any resistor across the entire 
> > string won't result in any current flow, yet the capacitors are 
> > still charged. 
> > 
> > For a MMC, the only safe approach is to put resistors across each 
> > capacitor. 
> 
>There is more than one safe approach, which I mentioned in my 
>previous post. Again, aside from using resistors across all 
>capacitors, you can do the following: 
> 
>1). Use a single HV resistor across the entire MMC 
>2). Shield the open connections with plastic so there is a physical 
>barrier. 
> 
>Doing both of these will keep you safe. Not one or the other, but 
>both. If you omit the plastic, you could take a shock from the 
>residual charge on the inner cap's. If you keep the plastic but omit 
>the main resistor, you could take a shock from other coil components 
>that are connected to the MMC...(that is, if and only if the 
>transformer secondary winding goes open circuit,,,in conventional TC 
>setup). 
> 
>Take care, 
> 
>Justin Hays 
>KC5PNP 
>Email: justin-at-hvguy-dot-com 
>Website: www.hvguy-dot-com 
> 
> 
>