Re: Multi lead power transformer, how to identify windings.
I would not connect mains voltage to a winding unless I was sure it was designed to withstand 360v (the peak voltage of the mains waveform).
I would use another transformer with a 6v output (or less) and a current limiting resistor and connect it to the winding that seemed to be the mains primary.
If I guess correctly, the other windings will output a safe low voltage which I can measure and work out the ratios of the windings.
If I guess incorrectly, one of the windings could have a very high voltage on it.
I recently tested some output transformers by feeding 2v ac into the secondary windings.
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