On 2009-09-27, brian whatcott wrote:
...
The leakage path for current in an insulated wire is strikingly
different from the leakage path in a magnetic conductor - usually called
a core or stamping.
The leakage resistance can easily be 1000 megohms compared to the
conductor's resistance of (say) 1 ohm. A ratio of a billion to one.
The leakage path for cores and stampings is lucky to be a thousand times
more "resistive" than the path through the core - if it's an iron
stamping, an iron dust core, or a ferrite core. A ratio of a thousand to
one.
For air cored coils, the leakage path is lower still, so that the
magnetic path does not couple all turns together at the best of times.

If an end turn or two is shorted, the reactive current in the shorted
turn pinches off most of the magnetic coupling from the remaining coil
altogether, so the effect is not as dramatic as we might expect.
Waddaya think of that?

Thanks for this posting. You are totally right. I tried to explain
thinks a little more easier. And if you try to reduce complexity in an
explanation, you have to simplyfy. Looks like I simplyfied too much.
My fault.