Re: New Transformer/Gap Quenching

["Malcolm Watts" <M.J.Watts-at-massey.ac.nz> (by way of Terry Fritz <twftesla-at-uswest-dot-net>)]

Hi Boris, all,
                An addendum to my post:

On 6 Jul 00, at 6:36, boris petkovic wrote:

> Hi Malcolm,
> 
> 
> > and a high 
> > magnetizing current (about 6A) due to fewer than
> > optimal 
> > primary turns for the core which was the result of a
> > 
> > successful attempt to boost its output with a fixed
> > secondary.
> ------
> I have an access to 220V/ 6000V-at-800 mA rated power
> transformer here.Logically, I'd like to employ it for
> TC powering project.
> Quick estimation for 2XFmains (=100BPS) discharging
> cap frequency and rated power output would give Cp
> needed in access of 0.5 uF!!
> 
> .So,it would be totally inadequate for resonant freq
> of planed TC,and for my expenses,and  Xp would be to
> low  and not to mention   other problems.
> .

If the transformer does have k ~1 between Lp and Ls, you can 
use a choke to provide the charging characteristics you 
desire. In this case, your cap value then depends on the value 
of the external reactor so can be anything you like. If the 
inductor is placed on the secondary side of the transformer, 
it will have a value in the Henries to 10's of Henries range 
(for resonant charging match Xc to Xl). Transformer voltage 
will be boosted by resonant charging action and the choke will 
have to withstand the voltage burden (which is nice for the 
transformer. If the choke is placed on the primary side, it 
will have a value in the mH range - note that the cap is now 
resonating with an inductance transformed by (Np/Ns)^2. The 
voltage burden in this case shifts to the transformer windings 
(which is why people running high BIL rated pole pigs with 
welders in the primary get away with it).

Regards,
Malcolm