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RE: any insulation recomendations for magnet wire
Ed, David -
As you know I am interested in the design of Tesla coils and improving my
JHCTES Ver 2.3 TC computer program. Therefore, when somone mentions TC
design my interest is aroused because I may learn something new. Tesla
coilers have always had the problem of the secondary wire insulation
breaking down during coil operation. As you said this could be due to faulty
design. However, it could also be due to a well designed coil except for not
enough secondary wire insulation. How would the designer know this without
information regarding the voltage stress on the secondary wiring?
When I was developing the JHCTES program I realized a parameter that would
alert the designer to the secondary wire voltage stress would be of use in
the selection of the wire insulation. The parameter I choose was a "volts
per turn" which varies with every coil. It is obvious this parameter is
approximate but does give the designer guidelines with which to select the
secondary wire insulation.
Ever coiler who has done much coiling has at one time had problems with
secondary wire insulation breakdowns during operation. These breakdowns can
occur anywhere along the secondary coil. The voltage to ground varies
nonuniformly from the bottom to the top terminal of the coil. However, the
volts per turn would vary very little so an approximate average volts per
turn can be used. At present the estimated volts per turn can be found only
in the JHCTES Ver 2.3 program.
John Couture
----------------------------
-----Original Message-----
From: Tesla list [mailto:tesla-at-pupman-dot-com]
Sent: Sunday, July 16, 2000 5:01 PM
To: tesla-at-pupman-dot-com
Subject: Re: any insulation recomendations for magnet wire
Original poster: "Edward Wingate" <ewing7-at-rochester.rr-dot-com>
Tesla list wrote:
>
> Original poster: "John H. Couture" <couturejh-at-worldnet.att-dot-net>
>
> David -
>
> "if the system is designed properly". What are the proper design
> requirements for using the single vesus the double insulation? The JHCTES
> Ver 2.3 program gives a "volts per turn" parameter for making this
decision.
> What are your ideas?
>
> John Couture
John,
You still haven't read pages A-22 and A-23 in Richard Hull's book that I
referenced you to some time ago, have you?
What David is trying to say is that it just doesn't matter whether you
use "single or double" insulation if the coil is designed, built and
tuned properly! If someone wants to opt for extra insulation on their
secondary wire for a little (very little) extra insurance against
arcover during the tuneup process, great, oterwise it just doesn't
matter!
How can you have a volts per turn parameter in your program when in
reality the turn to turn voltage in a real live secondary or extracoil
isn't uniform from bottom to top?
Ed Wingate RATCB