Re: Coupling coefficient of industrial transformers

M. Bruhns

I thought of doing like you suggested, using the simulation and
comparing with the actual circuit, but I didn't think it could work
because I want to know "k" to figure out what kind of voltage kick-
back the leakage inductance would send back to the "H" bridge. Since
that kick-back might be large enough to destroy the bridge, I was
using the simulation to avoid destroying expensive IGBTs. In the
simulation, if "k" is equal to 1 there is no kick-back, if it is .99,
the kick back is quite large.

M. Phantom

I read a few of the post you recommended and I read other post on
"Leakage Inductance" and a lot of them revolve around shorting the
secondary. By doing this, how will it not destroy the transformer,
unless you use lower voltage than its nominal voltage. I could connect
the 10 Kva transformer I have on 125 Vac on the primary and measure
the OCV of the secondary and vice versa if this method is good enough.
I have a microwave transformer, that I rewound the secondary with 40
turns of # 10 wire, to make some test. I would like to know "k" for
that transformer but I couldn't feed the secondary with 125 Vac, the
current would be too high and if I use a lower voltage coming from a
small transformer, like lets say a 16 Vac, 40 Va transformer, it will
need to be able to supply more current than it was designed for if
it's connected to the secondary of the MOT.
I have a question about MOT, when I connected the transformer to 125
Vac, with the secondary disconnected it drew about 3 Amps., if I
removed the magnetic shunt, I believe it would be called, between the
primary and secondary winding, the current goes to 5 Amps. How would I
know if it's saturating or close to saturating.

Thanks

.

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