Re: [TCML] Not an Oudin coil (was: Re: Single ear piglet)

[Yurtle Turtle <yurtle_t@xxxxxxxxx>]

Why not simply assume any 12' arcs from a pig powered coil are bad? To do otherwise seems to be pretty STUPID!

Adam

--- On Sun, 4/26/09, Antonio Carlos M. de Queiroz <acmdq@xxxxxxxxxx> wrote:

> From: Antonio Carlos M. de Queiroz <acmdq@xxxxxxxxxx>
> Subject: Re: [TCML] Not an Oudin coil (was: Re: Single ear piglet)
> To: "Tesla Coil Mailing List" <tesla@xxxxxxxxxx>
> Date: Sunday, April 26, 2009, 8:16 AM
> J. Aaron Holmes wrote:
> > An Oudin coil is an autotransformer, yes? 
> Definitely not what you're doing, David.  An Oudin coil
> with a one-eared pole pig for a primary source would
> certainly be far, far greater *guaranteed* danger than a
> similar Tesla coil with a primary/secondary
> arrangement.  An Oudin coil with a one-eared pig means
> that you're standing on one leg of the primary HV and the
> other is wired directly to the streamer that's about to hit
> you.  With a Tesla coil, the concern for 50/60Hz on the
> streamers is generally tied to the concern that a
> coincidental primary-to-secondary flashover occurs, setting
> up a transient Oudin-coil-like scenario.  Still not
> something to scoff at, but you do have to get [un]lucky.
> Actually, the danger is not so great. An autotransformer
> and a true transformer work exactly in the same way. If you
> feel safe with a conventional coil with primary and
> secondary coils grounded, you are also safe with an
> autotransformer, because looking at what appears at the
> output there is no way to tell what is the actual
> configuration. The low inductance of the primary coil
> short-circuits the power line current to ground very
> effectively, and there is a capacitor in series too. The
> difference in risk is what happens if for some reason the
> ground connection of the coils is interrupted. With a true
> transformer, nothing happens at the secondary. With an
> autotransformer the power supply is directly connected to
> the output terminal.
> 
> Antonio Carlos M. de Queiroz
> 
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