Re: Variac nonsense
- From: "Phil Allison" <philallison@xxxxxxxxxx>
- Date: Mon, 16 Feb 2009 11:55:19 +1100
"John Larkin"
After all, it's no different from any other transformer with a shorted
turn. The math is the same. Toroids have low leakage inductance, so
the shorted-turn current depends mostly on the turns/volt and the
ohms/turn.
** Toroidal TRANSFORMERS have low I leakage from primary to secondary (
being as the two are overwound right round the core ) - but a variac is
NOT one of them.
Magnetic coupling from one part of the winding on a variac to non-adjacent
parts comes via the wound iron strip - and that means HIGH leakage
inductance.
Only reason there is not a lot of voltage loss due to this is the fact it is
all one winding and hence directly coupled by the resistance of the copper
wire.
...... Phil
.
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