RE: any insulation recomendations for magnet wire

["Richard Kircher" <richard.kircher-at-worldnet.att-dot-net> (by way of Terry Fritz <twftesla-at-uswest-dot-net>)]

John,
	I don't understand what's so magical about volts per turn.  I seems like
it is just an estimate of the secondary terminal voltage divided by the
number of turns.  The no. of turns can be counted and the secondary voltage
can be computed in a variety of ways such as the using the ratio of primary
to secondary capacitance and efficiency of the coil.  It's hard to get it
exact, but does it have to be?  Most of us want long sparks first, and coil
longevity second, so low volts per turn is not usually of interest.
Dick

At 06:25 PM 7/17/00 -0600, you wrote:
>Original poster: "John H. Couture" <couturejh-at-worldnet.att-dot-net> 
>
>
>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
>