Re: [TCML] More wire better?

["Jared Dwarshuis" <jdwarshuis@xxxxxxxxx>]

Capacitive reactance current limiting is something you already understand.

[ I(peak) = Omega x Cap x Voltage(peak)]  applies to pole pigs the same as
it does for NST.

  Our system uses:

(10 Kva) pig.
30amp desired with 240V input yields  500ma (peak) current at the high
votage end.

14.4 kv x sqrt(2) yields approx. 20kv (peak).

Omega = 2pi x 60hz.

Solving yields approx .09uf,  This is the value of our tank capacitor.

No more current can flow than is set by the equation above.

Of course you still need a ballast to handle the momentary shorts. But it
does not need to be as large as with systems using smaller tank capacitors.

Jared Dwarshuis, Larry Morris


On Dec 18, 2007 9:44 PM, Barton B. Anderson <bartb@xxxxxxxxxxxxxxxx> wrote:

> I was assuming this to be a separate cap as in a capacitive limiting
> scheme (even through Jared said "tank" cap)?
> Am I wrong about that assumption?
>
> Bart
>
> Ed Phillips wrote:
> > Hi Gary:
> >
> > We use large tank capacitance in part for high Q. We also use large tank
> > capacitance as part of current limiting. A way to minimize pig ballast."
> >
> >     How about explaining how large tank capacitance provides current
> > limiting??  Large C > low reactance, larger charging current for same
> > transformer.
> >
> > Ed
> >
> >
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> >
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