Entertainment Electricity: I was once working on a film set when a feeder transformer began behaving badly. A supplier had dropped off a generator and the transformer, and after they were both connected and energized, but before any load was even connected, much less turned on, the transformer was humming loudly. In my experience, that could mean one of two things: either the transformer has a high harmonic load, or it is dying a long, slow death. Since there was no load connected in this case, it seemed apparent that this particular transformer was not long for this world.
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