RE: Mega-Sized Secondaries

["John H. Couture" <couturejh-at-xxxxxxxxxxxxxxxx> (by way of Terry Fritz <twftesla-at-xxxxxxxxxx>)]

Terry -

Thank you for the secondary current information. Your ma currents appear to
me to be too low for instantaneous secondary currents. What equations did
you use to calculate them? I also am working on the problem and will post
the results on the List shortly. I still do not understand what Paul meant
by the charge conservation losses in the secondary coil. Or did I
misinterpret his comment?

Charge conservation like energy conservation is a fundamental electrical
concept but what equations is he using? Are they the fourth order
differential equations that the Corums showed in their TCTUTOR? Are these
the equations your Linux computer is using? I would be interested in the
Linux results although I do not consider myself a "pure science" type.

John Couture

--------------------------




-----Original Message-----
From: Tesla list [mailto:tesla-at-pupman-dot-com]
Sent: Sunday, October 29, 2000 6:02 PM
To: tesla-at-pupman-dot-com
Subject: RE: Mega-Sized Secondaries


Original poster: Terry Fritz <twftesla-at-uswest-dot-net>

Hi John,

	Paul's program is running on my other Linux computer right now!  Perhaps
the heavy computing is better suited to the pure science types than the
average TC builder at the moment :-)))

As far as the currents go.  "I" would say it is roughly proportional to the
ratio of self capacitance and top load capacitance compared to total
capacitance.  Of course, Paul's program may change that rule, but for 'this
moment' that's what I go by...

My lumped models predict for my big coil:

Cself 15.7pF
Ctop 28.5pF
Ibase 320mA
Iself = 103mA
Itop 190mA
Istreamer 27mA

Cself + Ctop = 44.2pF

15.7 / 44.2 x 320 = 114 mA  (close to Iself)
28.5 / 44.2 x 320 = 206 mA  (close to Itop)

If I could rationally account for the streamer current, these numbers would
be closer.  But we'll wait awhile until The TSSP project and all the number
crunching confirm such lumped predictions before getting too carried away,
but I bet they will still be close...

Cheers,

	Terry


At 12:59 PM 10/29/2000 -0800, you wrote:
>
>Paul -
>
>Checked out the website. Four days to compute one Tesla coil parameter! Do
>you have something much faster that could be used in a program that
>coordinates and calculates about 46 TC parameters?
>
>Regarding the charge conservation what is the approximate overall percent
>difference between the current at the bottom of the secondary compared to
>the current at the top of the secondary coil? Could you break this up into
>corona losses and charge conservation? The charge conservation is new to
me.
>
>John Couture
>
>--------------------------------
>
>
>
>-----Original Message-----
>From: Tesla list [mailto:tesla-at-pupman-dot-com]
>Sent: Sunday, October 29, 2000 7:35 AM
>To: tesla-at-pupman-dot-com
>Subject: Re: Mega-Sized Secondaries
>
>
>Original poster: paul-at-abelian.demon.co.uk
>
>John Couture wrote:
>> Except for negligible corona losses along the coil the secondary
>> current is the same at the top of the coil as at the bottom.
>
>Only approximately true under exceptional conditions.
>
>The requirement of charge conservation enforces a generally
>decreasing current with height as current is diverted to charge
>up the distributed capacitance.
>
>List members interested in taking a nauseatingly close look
>at the physics of tesla secondaries may like to look at an
>ongoing modeling project,
>
> http://www.abelian.demon.co.uk/tssp/
>
>Regards,
>--
>Paul Nicholson,
>Manchester, UK.
>--
>
>
>