Re: Toploads that bite

• To: tesla-at-pupman-dot-com
• Subject: Re: Toploads that bite
• From: "Herwig Roscher" <herwig.roscher-at-gmx.de> (by way of Terry Fritz <twftesla-at-uswest-dot-net>)
• Date: Tue, 15 Feb 2000 07:34:23 -0700
• Approved: twftesla-at-uswest-dot-net
• Delivered-To: fixup-tesla-at-pupman-dot-com-at-fixme

> > In my system I've used 34 Ohms consisting of two
> > parallelled 68 Ohm/100 W resistors.
 
Nick Field wrote:

> That surprises me, assuming a 10kV supply your peak current 
through each resistor is more than 100A - not for very long but at 
that current level it doesn't have to be.
- The energy stored in my MMC is less than 7 Joule = Ws. I've 
choosen high power resistors in series with the cap safety gap 
mainly because of their capability to dump that large current. They 
don't get warm at all.

> As for the oscillations - that is what the tank circuit is there for.
- The tank circuit is designed for a specific frequency and I don't 
know what will happen if there was a flashover starting oscillations 
at an other frequency (C = MMC and L = coil instead of series 
resistor).

 > > > I personally advocate discharge resistors (note I said 
'discharge' not equalising') across all the caps
> > - Every single cap of the MMC has got its 10 MOhm bleeder of
> > course. 10 MOhm is much to high to act as an equalizing resistor.
> I didn't mean across each cap of the mmc, I meant across all standalone
> capacitors - In the mmc case that would mean across the whole lot.
- Using only one bleeding resistor per string or per MMC doesn't 
guarantee that all of the caps are discharged in case of blown 
capacitors. Therefore it's much safer to use a bleeder resistor 
across each single cap.

Safe coiling to you!

Regards 		Herwig

• Prev: Re: Damages to Electronic Equipment
• Next: RE: High Voltage Filters
• Index(es):
  • Main
  • Thread