Re: 9kV coil systems

• To: tesla-at-pupman-dot-com
• Subject: Re: 9kV coil systems
• From: "Reinhard Walter Buchner" <rw.buchner-at-verbund-dot-net> (by way of Terry Fritz <twftesla-at-uswest-dot-net>)
• Date: Tue, 06 Jul 1999 08:16:59 -0600
• Approved: twftesla-at-uswest-dot-net
• Delivered-To: fixup-tesla-at-pupman-dot-com-at-fixme

Hi Kevin,

> Original Poster: "Kevin Wahila" <knw2-at-lehigh.edu>
> just for comparision sake, for anyone that has 9kV transformers
> powering their coil, what kind of output are you getting?  what
>could be expected with 30, 60 or 90mA?

Well, I donīt use a 9kV xformer, but rather, the next step down
in voltage (7.5kV). My secondary is 8" diameter. Here are a
few comparisons FYI:

1.) 9kV-at-30mA
-->7.5kV-at-36mA
-->270VA
Sorry, for this value, I donīt have a direct comparison handy.
I did use a 10kV OBIT at 200VA tho, and this got me around
10", but I did not max out this design.

2.) 9kV-at-60mA
-->7.5kV-at-72mA
-->540VA
My xformer was a 75mA jobber, which is close enough.
The maximum spark length I got from this setup was around 40".

3.) 9kV-at-90mA
-->7.5kV-at-108mA
-->810VA

The maximum spark length, I got from a similar setup was ~50-51".
My input VA was more like 900VA in this case, which is slightly more
than the faceplate value of your 3 xformers. However, you will need
to measure the actual current, that your 3 NST setup deliever. I
would say with careful construction and tuning efforts, you can
get around 45" sparks with your NST psu.


Coiler greets from germany,
Reinhard

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