which disease?

To: "'Tesla List'" <tesla-at-pupman-dot-com>
Subject: which disease?
From: Tesla List <tesla-at-stic-dot-net>
Date: Thu, 19 Mar 1998 23:29:52 -0600
Approved: tesla-at-stic-dot-net


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From:  Dan Kline [SMTP:ntesla-at-ntesla.csd.sc.edu]
Sent:  Thursday, March 19, 1998 9:57 AM
To:  tesla-at-pupman-dot-com
Subject:  which disease?

>----------
>From:  Malcolm Watts [SMTP:MALCOLM-at-directorate.wnp.ac.nz]
>Sent:  Thursday, March 19, 1998 12:46 AM
>To:  Tesla List
>Subject:  Re: which disease?
>
>Hi Arwin,
>
>> From:  solva-wijnschenk [SMTP:solva-at-xs4all.nl]
>> Sent:  Wednesday, March 18, 1998 6:20 PM

>> Dear All, I need some help.
[snip]
>> I wound a coil (diam. 4.33", height 33.66") 

That's rather tall for that diameter

>> I now get breakouts (>20") at half of the form, distroying my turns. I
>> am using a cap wound from 2.5mm thick red plastic (don't know the
>> material) 2 plates from about 20 cm widht and 7 meters long. Primary is
>> 7.5 turns of .5" copper tube, gap=single .5", toroids vary. Best
>> sparklength I get (don't understand!!!) with a very small toroid! Supply
>> is a 10 kv 10kva plate transformer and a variac.
>
>Either one of two things is happening when the windings flashover - 
>either your primary energy is such that it generates too high a 
>voltage in the secondary or it is marginal and corona leakage is 
>finishing the job. If the primary is a helix, forming it into a flat 
>spiral might effect a cure as long as the voltage across the 
>secondary isn't excessive.
>
>Be interested to hear what others would do.

I'd put the primary in the center and make a bipolar, horizontal coil with
outputs on each end. I've actually done this years ago with coils would
from "radio" designs, and they worked fine. But unless the primary is large
in diameter, you'll need lots of insulation between the primary and
secondary :)

Dan