Homemade HV transformer

["Garth van Sittert" <garth-at-mediasupplies.co.za> (by way of Terry Fritz <twftesla-at-uswest-dot-net>)]

Can anyone help with this??


----- Original Message -----
From: Tesla list <tesla-at-pupman-dot-com>
To: <tesla-at-pupman-dot-com>
Sent: Sunday, July 30, 2000 11:57 PM
Subject: Homemade HV transformer


> Original poster: "Garth van Sittert" <garth-at-mediasupplies.co.za>
>
> I have a large laminated core and bobbins only with no primary or
secondary
> (ie: no copper at all) that I am hoping to wind for coil use.  The core is
2" x
> 2".  Bobbins are 6" high.  What sort of VA ratings could I get out of
this,
> 3600VA.
>
> So far I have calculated -at- 50 Hz 220V
>     primary:    275 turns   (This gives me an excitation current of 10% of
the
> propposed max. primary current).
>     secondary: 15000 turns (12kV -at- 300mA)
>
> Is this correct.
>
> Firstly, I wound the primary bobbin with #22 wire for test purposes about
400
> turns, and then reduced the turns until I had a no load current of 1.5A
(10% of
> max.)  This gave me the required turns per volt.  Now I intend to wind the
> primary with 275 turns of max guage wire I can fit onto the bobbin.
>
> I saw some general rule somewhere that turns per volt = 5/A where A is the
core
> area in sq. inches.
>
> Will this blow up or have I gone about this correctly.
>
> Thanks
> Garth.
>
>
>
>