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RE: pri. 110V power transformer

While it might seem that you could use a 120V : 6V transformer as 240 : 12V, it's not possible in practice. Doubling the voltage will double the magnetic flux in the core, probably exceeding the level that saturates the core. At saturation, the inductance drops drastically, and the magnetizing current (the current at no load) rises drastically too. A transformer COULD be made to run at a lower flux level (using more wire or bigger core) but would be less efficient unless you made it MUCH larger. So transformers are made to run fairly close to the saturation level for economic reasons. I have found that running a typical 50/60 Hz transformer at 50 Hz or 20% high voltage on 60 Hz (both giving a 20% increase in peak magnetic flux) will double the magnetizing current, so the core is already in a nonlinear range. Doubling the voltage would make the transformer primary look almost like a short to the incoming AC.


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