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The transformer looks nearly like an open-circuit

(or a huge inductor) until the core saturates. It will conduct some small magnetizing current until the core saturates, then it will look like a short-circuit. The nonlinear behavior of the core makes it look a lot more like an ideal transformer than an inductor until the core saturates.

It will only look like an inductor with a time constant comparable to the inverse of the power frequency if such an inductor is attached to the secondary as a load.

Sorry to curtail this discussion, but I'm going out of town and won't be back before 13 May.


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