Re: is this the correct piggy?

["Tesla list" <tesla@xxxxxxxxxx>]

Original poster: "J. Aaron Holmes" <jaholmes@xxxxxxxxxxxxxxxxxx>

Thanks, Gerry!  Yeah, I think now that my confusion
arose from a prior discussion about saturable reactors
in which saturation was described as a function simply
of A x Turns.  Of course, this was referring to the
*DC* control winding!  My mistake.

It still surprises me that one would only expect ~140%
from a pig with double the input voltage.  I do seem
to recall that his overvolted pig could start a JL at
nearly twice the distance it could when operating at
normal voltage.  I don't know if this is the best
indicator, though, but I would think it was a good
sign that he was actually getting nearly twice the
voltage out.  Too bad the pig fried.  Otherwise I'd
see about measuring it!  Actually, he's still got it,
and I've been urging him to conduct a proper autopsy
:-)

Perhaps Aron or Justin (of hvguy.com) will chime in
here with their experience, since they not only
overvolted their 7.2kV unit 2x, but also drove it up
to 25kVA, and it was only rated for 5kVA.  I think it
survived, or else they never told of its demise...

Regards,
Aaron, N7OE

--- Tesla list <tesla@xxxxxxxxxx> wrote:

> Original poster: "Gerry  Reynolds"
> <gerryreynolds@xxxxxxxxxxxxx>
>
> Hi Aaron,
>
> Core saturation is a function of the volts per turn,
> the core area,
> the line frequency, and the core material.  A core
> will saturate just
> as well with the secondary unloaded as not.  For the
> volts per turn,
> freq, and core area all being fixed,  the dphi/dt
> remains constant
> and the peak flux (phi) thru the core remains
> constant.  When you
> load down the secondary and allow current in it to
> flow, the flux
> generated by the secondary will be counter to the
> flux in the core
> with an unloaded secondary.  The current in the
> primary will then
> increase enough so the total flux in the core stays
> the same.
>
> Gerry R.
>
>
>
> >Original poster: "J. Aaron Holmes"
> <jaholmes@xxxxxxxxxxxxxxxxxx>
> >
> >Hey, David!  So, what you're saying is that it's
> tied
> >to core saturation, then?  Or am I
> misunderstanding?
> >But isn't core saturation more a function of power
> >throughput in an AC transformer?  Will simply
> >increasing the voltage lead to saturation, or
> wouldn't
> >you also have to load the transformer down beyond
> its
> >rated power throughput?  I thought the latter was
> the
> >case, but my mental model of a transformer is
> >over-simplified, I'm sure!
> >
> >Regards,
> >Aaron, N7OE
> >
> >
>
>
>
>
>
>