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

["J. Aaron Holmes" <jaholmes6502@xxxxxxxxx>]

Thanks Antonio.  Of course you're right; the primary does effectively "short" the 50/60Hz HV out.  Unless it's compromised, of course ;-))  But now we're back to coincidences.

> > 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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