Re: Ballasting question

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

Original poster: "Jason Petrou by way of Terry Fritz <twftesla-at-qwest-dot-net>" <jasonp-at-btinternet-dot-com>

Ballasting an NST is complately pointless. NSTs  (and OBITS) are current
limited (shunted) by design. All that you will do is loose heat in the
windings of a ballast.
To get the resistance of an (air cored?) ballast you do 2.pi.20.H where H is
the inductance in henries... it varies for ferrite core which is what
everyone uses :) I think you have to use a multiplier but im not sure..

Does anyone have an equation to work out ballasting on a ferrite core or is
it just by experimentation?

Jason
----- Original Message -----
From: "Tesla list" <tesla-at-pupman-dot-com>
To: <tesla-at-pupman-dot-com>
Sent: Tuesday, June 26, 2001 8:17 PM
Subject: Re: Ballasting question


> Original poster: "CJ Moore by way of Terry Fritz <twftesla-at-qwest-dot-net>"
<wizard1234-at-home-dot-com>
>
> So ballasting is not necessary not matter what the scenario is if you
using
> a shunted power supply?
>
> ----- Original Message -----
> From: "Tesla list" <tesla-at-pupman-dot-com>
> To: <tesla-at-pupman-dot-com>
> Sent: Tuesday, June 26, 2001 8:51 AM
> Subject: Re: Ballasting question
>
>
> > Original poster: "Charles Hobson by way of Terry Fritz
> <twftesla-at-qwest-dot-net>" <charles.a.hobson-at-btinternet-dot-com>
> >
> > ----- Original Message -----
> > From: Tesla list <tesla-at-pupman-dot-com>
> > To: <tesla-at-pupman-dot-com>
> > Sent: Monday, June 25, 2001 11:15 PM
> > Subject: Ballasting question
> >
> >
> > > Original poster: "Michael O. Poley by way of Terry Fritz
> > <twftesla-at-qwest-dot-net>" <mpoley-at-mindspring-dot-com>
> > >
> > > Okay, since I got such a fast response on the other question, let me
ask
> > > this...
> > >
> > > Can someone explain the theory and practice of "ballasting"?  I'm
> familiar
> > > enough with the physics behind the Tesla coil, but the term has been
> > > bandied about a lot and I haven't seen anything explaining what
exactly
> > > ballasting is nor when it should be done, and when it is acceptable to
> > > overlook it.
> > >
> > > Mike
> > >
> > > Michael O. Poley
> > > mpoley-at-mindspring-dot-com
> >
> > Hi Mike,
> >
> > I hope you get some good clear answers to your question. I am looking
> > forward to them also. My understanding for ballast is limited relative
to
> > Tesla Coil application, but as I see it, the ballast in needed for
systems
> > using "pole pigs", transformers where if the secondary is shorted, "like
> > with a spark gap" , the primary see the short also. Hence, the minimum
> > inductance needed in series with the primary appears to be a function of
> the
> > transformer's maximum VA rating. (You experienced guys please correct me
> on
> > this if I am wrong)
> >
> > But that's not where it seems to stop. Between bangs the transformer is
> > looking at the Tesla Coil's primary tank circuit capacitor Cp. Thus,
there
> > appears to be an LC series circuit comprising Cp and L where L = ballast
> > inductance x N^2 (pole pig turns ratio). Please again you experienced
> guys,
> > jump in and correct me if this is wrong. If I am right in this, then the
> > ballast inductance can be increased from its minimum value to where it
> will
> > resonate with Cp at 50/60Hz. Again the transformer primary circuit will
> > behave as a short circuit at resonance. So--- some value between the
> minimum
> > inductance and the resonating inductance needs to be worked out. I think
> > inductances greater than the resonant value can also be
considered.(Please
> > again you experts, help!!) There seems again here to be computer
programs
> > around to work this all out, but I would like to see and understand the
> > algorithms used.
> >
> > I hope this is helpful here or has stirred up better and more correct
> > answers to your question.
> >
> > Chuck
> >
> >
> >
>
>
>