RE: Terry's Protection Filter

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

Original poster: "Loudner, Godfrey by way of Terry Fritz <twftesla-at-qwest-dot-net>" <gloudner-at-SINTE.EDU>

Hi All

Charles Brush at http://www.voltnet-dot-com forgot to change safety gap when
switching from a 19.9kV/15kVA pig to a 14.4kV/5kVA
pig. The 14.4kV pig blew from HV kickbacks. The accident is described at the
bottom of page  http://www.voltnet-dot-com/tesla/cfbcoil3.html. If HV kickbacks
were the real reason the pig failed, then the importance of safety gaps for
pigs is emphasized.

Godfrey Loudner


> -----Original Message-----
> From:	Tesla list [SMTP:tesla-at-pupman-dot-com]
> Sent:	Sunday, July 22, 2001 4:03 PM
> To:	tesla-at-pupman-dot-com
> Subject:	Re: Terry's Protection Filter
> 
> Original poster: "Terry Fritz" <twftesla-at-qwest-dot-net>
> 
> Hi Dave,
> 
> I have only worked with NSTs in this protection circuit area.  I hear pigs
> don't need protection since they never fail.  I guess one or two have
> failed
> but under really bazaar situations.  Like running them without oil for a
> few
> years...
> 
> I sold a bunch of 80 amps EMI filters once for the input side but things
> like
> that only help keep electrical noise off the AC wiring.
> 
> I don't think protection circuits are a concern for pigs.
> 
> Cheers,
> 
>         Terry
> 
> At 01:17 AM 7/22/2001 -0400, you wrote: 
> >
> > Hello Terry, all, 
> >
> > I was wondering if you ever considered designing a pole 
> > pig compatable version of your protective filter circuit? I know 
> > the 1800 volt MOVs won't take the current, but I was just 
> > wondering if this circuit could be made "piggie friendly"? 
> > I've found, as others have, that pole pigs are very robust 
> > beasts that can easily handle the abuse of Tesla circuits, 
> > but I was thinking in case one wanted to play it safe, it 
> > would be nice to have a filter circuit suitable for a pole 
> > pig. I'm using a lightning arrester for the safety gap of my pig 
> > system, but I still have air-cores inductors for the RF filters 
> > and I think these may do more harm than good. I suppose 
> > the sheer toughness of pole pigs has rendered the development 
> > of a filter circuit for them perceived as unneeded. Just won- 
> > dering. 
> >
> > Sparkin' in Memphis, 
> > David Rieben
> 
> 
>