Re: What is Kickback Part 2?

To: tesla-at-pupman-dot-com
Subject: Re: What is Kickback Part 2?
From: "Antonio Carlos M. de Queiroz" <acmq-at-compuland-dot-com.br> (by way of Terry Fritz <twftesla-at-uswest-dot-net>)
Date: Sat, 08 Jan 2000 12:32:57 -0700
Approved: twftesla-at-uswest-dot-net
Delivered-To: fixup-tesla-at-pupman-dot-com-at-fixme

Bunnykiller wrote:

>...
> there is also a thumping noise heard in the pole pig as the spark gap
> increases in brightness as the amp meter swings from 20 - 50 A.
>...
> Am i seeing sometype of inductance kick back from the current limiting
> inductor to the transformer ?  is there some kind of resonance going on
> here?
> 
> I tried doing the math but i find no resonance factor that could cause
> this amperage swing...    but then again  theoretical and practical are
> 2 different animals.

What you see is the transient caused by the sudden connection of an
inductor with zero current at an instant where the steady state
current on it should be something very different from zero. This
is a nonoscillatory transient, with current and voltage waveforms 
of the type K*e^(-a*t) appearing everywhere. Nonlinear effects as
core saturations may occur too. Some series resistance in the
inductors would reduce the duration of the transient, and waste
some power too.

Antonio Carlos M. de Queiroz