Re: DIY HV transformer

["Tesla list" <tesla@xxxxxxxxxx>]

Original poster: "Malcolm Watts" <m.j.watts@xxxxxxxxxxxx>

I said:

On 12 Jul 2005, at 16:01, Tesla list wrote:

> Original poster: "Malcolm Watts" <m.j.watts@xxxxxxxxxxxx>
>
> Hi Christoph,
>
> On 12 Jul 2005, at 12:00, Tesla list wrote:
>
>  > Original poster: "Christoph Bohr" <cb@xxxxxxxxxxxxxxx>
>  >
>  > Hello everyone.
>  >
>  > As you may have noticed during the last few days, I had some
>  trouble > with my 6-mot-stack, which finally lead to a failure mode
>  that makes > diagnosis very difficult, so I wanted to try something
>  else: Wind my > own transformer: first pictures of the winding
>  process can be seen > here: http://www.luebke-lands.de/tesla19.html
>  along with some basic > specs. > > The transformer is intended to be
>  run unter oil, but another problem > arises: > > The core material I
>  am winding this transformer on, is the core of my > former ballast
>  coil, which means I no longer have one. Now, can I > incooperate some
>  shunts or airgap to limit the current so that I don't > have to build
>  another ballast coil? The core is basicaly rectangular, > with each
>  of the coils on one leg left and right... Maybe someone has > an idea
>  here. Maybe even with shunts, that can be moved by means of > some
>  mechanism while the transformer is still under oil.... > > I'm
>  thankfull for any suggestions.
>
> If the primary and secondary are on separate leads you may need no
> ballast at all.

That _should_ have been ..."separate legs..."

Sorry,
Malcolm


 The proximity of the windings to one another dictates
> the degree of leakage inductance present. I have used such
> transformers in the past no problem at all. The unknown is the amount
> of leakage inductance and the Cp size with which the transformer will
> resonate at Fmains. I'd try it ungapped with a Jacob's Ladder first.
> The worse you can do is pop a circuit breaker.
>
> Malcolm
>
>
>