Re: New Transformer/Gap Quenching

["Finn Hammer" <f-hammer-at-post5.tele.dk> (by way of Terry Fritz <twftesla-at-uswest-dot-net>)]

Malcolm!

Your statement about the relationship btwn chokes resulting in resonant
charging is interesting. The relationship btwn. a powerside inductor and
the tank cap is well known. For _tank side_ inductor multiply with turns
ratio squared.

But is there a way to calculate the value of a _tank side_ inductor
directly?

I would like to move into 3-phase rectified territory, but am unsure
about the method of calculating the value of the choke.

Making it is another matter that I`m familiar with, although I`l have to
drag out the Hanna curves to determine the airgap.

Cheers, Finn Hammer


Tesla list wrote:
> 
> Original poster: "Malcolm Watts" <M.J.Watts-at-massey.ac.nz>
> 
snip...

> > .
> 
> 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