Re: DIY HV transformer

["Tesla list" <tesla@xxxxxxxxxx>]

Original poster: "Mike" <mike.marcum@xxxxxxxxxxxx>

Well, you already wound it , but the way I'd wind it for built-in limiting 
is use an E-I core ( or a rectangular I-core fore less weight if 1 is 
handy) with the Primary in the center and the 2 secondaries (midpoint 
ground em for 1/2 the insulation needed) on either outer leg. As long as 
the total magnetic path length seperating the pri/sec is at least 1/2  the 
total length and there's enough primary turns to keep the core from 
saturating with the given voltage, it'll be limited like an nst (open 
circuit voltage drops to about 1/2 under short circuit). No extra iron for 
shunts/ external ballast needed.

Mike

----- Original Message ----- From: "Tesla list" <tesla@xxxxxxxxxx>
To: <tesla@xxxxxxxxxx>
Sent: Tuesday, July 12, 2005 2:00 PM
Subject: DIY HV transformer


> 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.
>
> best regards
>
> Christoph