RE: Spark lenght.

["Tesla list" <tesla-at-pupman-dot-com>]

Original poster: "Loudner, Godfrey by way of Terry Fritz <twftesla-at-qwest-dot-net>" <gloudner-at-SINTE.EDU>

Hi Kamil

It looks like you interleaved the primary and secondary. This is an
effective way to get the coefficient of coupling between the primary and the
secondary close to 1. Windings are often connected in parallel in big power
transformers.

Godfrey Loudner

> -----Original Message-----
> From:	Tesla list [SMTP:tesla-at-pupman-dot-com]
> Sent:	Tuesday, November 13, 2001 8:50 AM
> To:	tesla-at-pupman-dot-com
> Subject:	Re: Spark lenght.
> 
> Original poster: "Kamil Kompa by way of Terry Fritz <twftesla-at-qwest-dot-net>"
> <tcmail-at-poczta.fm>
> 
> My core is EI type core. The middle leg is 38cmxcm both side-legs are 20
> cmxcm.
> All windihgs are on the middle leg. The core is designed for LV
> transformer so 
> there are not very big windows in the core. I don't know if it is a good
> design, 
> but my secondary windings are not woung in layers (too much space needed
> for
> isolator), but in separate sections along the core. I mean, there are not
> arranged
> on oneself  but close by oneself in 10 separate spools. The primary is
> wound on
> other spool arranged close by secondary spools. I also havn't got thick
> wire for
> primary so it is made of three layers of thin wire wound on oneself in one
> spool
> and connected in parallel (they have the same number of turns). 
> Do You think it's a good solution?    
> 
> *********** REPLY SEPARATOR  ***********
> 
> On 01-11-12 at 17:19 Tesla list wrote:
> 
> >Original poster: "Malcolm Watts by way of Terry Fritz
> <twftesla-at-qwest-dot-net>" <m.j.watts-at-massey.ac.nz>
> >
> >Hi Kamil,
> >           What type of core did you use? There must be a significant 
> >amount of leakage inductance or your spark test would have been 
> >popping fuses.
> >
> >On 12 Nov 2001, at 11:21, Tesla list wrote:
> >
> >> Original poster: "Kamil Kompa by way of Terry Fritz
> <twftesla-at-qwest-dot-net>"
> ><tcmail-at-poczta.fm>
> >> 
> >> Hi!
> >> 
> >> I have wound my own transformer(2000VA), and I think it is about 11kV.
> >> I have measured voltage on primary when secondary was connected to
> 230V,
> >> and it was 4.5V.
> >> I have also measured spark lenght between two nails and it was about
> 1,5cm.
> >> I have a table
> >> with spark lenght depanding on voltage, but only between spherical
> >> electrodes (i dont have smooth metal spheres).
> >> Can anyone using a 11kV transformer measure spark lenght between two
> wires
> >> (about 1mm diameter)?
> >> If it will be also about 1,5cm I will be sure that my transformer is
> really
> >> 11kV. 
> >
> >Peak output voltage (with no load of any kind connected) will be 
> >230V*SQRT(2)*Ns/Np = 16.6kV roughly.
> >
> >Malcolm
> 
> 
>