Re: srsg + mots - happy couple :-P

["Tesla list" <tesla@xxxxxxxxxx>]

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

Eariler I wrote:

On 25 Oct 2005, at 10:07, "Tesla list" <tesla@xxxxxxxxx wrote:

> A quick and dirty way of seeing how good the coupling really is is to
> note whether the switchboard breaker pops when the secondary is
> shorted. Coupling has to be measured under loaded conditions. Any
> unloaded transformer is going to give a false (high) figure under no
> load.

Note this applies only to sizable transformers - small appliance
transformers have too much resistance and will burn themselves out to
protect the breakers.

> Malcolm
>
> On 24 Oct 2005, at 12:40, Tesla list wrote:
>
> > Original poster: "Dmitry (father dest)" <dest@xxxxxxxxxxx>
> >
> >
> >  > Original poster: Steve Conner <steve@xxxxxxxxxxxx>
> >
> >  >>here are the model of my psu:
> >
> >  > It looks great to me. My only question is where will you get the
> >  > 20 henry inductor that can withstand 10kV?
> >
> > today i`ve measured the secondaries inductance of my 4 mots - 3
> > different models, all are rated for 220v, and all have a visible
> > saturation starting from approx. 180v, the shunts are not removed
> > yet.
> >
> > at Usec=1152v (Upri=113v) Lsec=140H, at Usec=1728v (Upri=173v)
> > Lsec=120H. coupling coefficient: a couple of the same mots - 0.97,
> > two more - 0.98 each. so, it seems that Lsec=127H and coupling=0.97
> > that i`ve used for my model, are rather real values :-P
> >
> > here`re the waveforms with NO inductor at all (I(L6) - it`s the
> > current through the mot secondary):
> >
> > http://cis.ru/~dest/my_psu22.GIF
> > http://cis.ru/~dest/my_psu33.GIF
> >
> > compare them with the old ones (with inductor in place):
> >
> > http://cis.ru/~dest/my_psu2.GIF
> > http://cis.ru/~dest/my_psu3.GIF
> >
> > d`you see any _considerable_ differences? i don`t, the current
> > increases just a tiny bit faster, but who  cares? :-)
> > so i think that "srsg + mots" would be a VERY happy couple :-D
> >
> > p.s.
> > sh@ttin switchercad doesn`t have "yellow" - only "green", but i
> > didn`t noticed it at night %-)
> >
> >
> >
>
>