RE: JHCTES - Primary Capacitor

["John H. Couture" <couturejh-at-worldnet.att-dot-net> (by way of Terry Fritz <twftesla-at-uswest-dot-net>)]

Bart -

Congratulations on making a TC program. I believe making TC programs is the
best way for a coiler to learn about Tesla coils. Building and testing a
coil is also good but you learn only about one type of coil. You have to
build many coils for best results.

I have used spreadsheets for many types of programs because they are very
versatile but you need the special spreadsheet program. I use a spreadsheet
program for a car leasing program. It is the only way I can find out what
interest I am really paying. The interest rate is always greater than what
the dealer says it is.

I have never heard of an equation for determining the current at the input
of a NST when a resonant capacitor is used. John Freau said the current was
about 200 ma or 2400 watts for his 12 KV 60 ma NTS. Because the resonant
condition is an abnormal condition and subject to many variables I believe
you will have to actually test the current for your NST setup. For a design
program start with 2 to 3 times the normal current or wattage.

John Couture

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

-----Original Message-----
From: Tesla list [mailto:tesla-at-pupman-dot-com]
Sent: Tuesday, July 25, 2000 7:20 PM
To: tesla-at-pupman-dot-com
Subject: Re: JHCTES - Primary Capacitor


Original poster: "Barton B. Anderson" <tesla123-at-pacbell-dot-net>

Hi John, All,

>
> Original poster: "John H. Couture" <couturejh-at-worldnet.att-dot-net>
>
> To All -
>
> The JHCTES Ver 3.1 computer program available on the Internet shows a
> default example for a 15KV/60ma NST. If the primary capacitor is changed
the
> secondary spark output will not change if the NST input current does not
> change. This is correct if there are no other changes in the inputs for
the
> system. However, if the pri cap is changed to a resonant type (.0107 uf
for
> this NST) the NST input current will increase because of the new cap. This
> new current value should be shown in the inputs. A new spark length will
> then be shown in the outputs.



Just like everyone else, I've been working on a TC program as well. I took
Ed
Sonderman's spreadsheet and modified it a few years ago (like everyone else
I
guess). Anyway, I'm creating a JavaScript version of the spreadsheet. The
advantage is that any of today's browsers will be able to run it on about
any
platform. Part of program involves the condition you describe above. One
input
I'm trying to resolve is the resonant cap condition.

Do you (or anyone else) know of a standard calc or table for determining the
increase in current (or power) due to the use of a resonant cap? For some
reason, I don't have a standard calc lying around for this. I guess I could
go
back to the books and figure this out, but thought it easier to ask the List
first.

Thanks for any help,
Bart