Quote:
Originally Posted by johnyjf
... Its about as noisy as a small battery power drill ...
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You're right, that is worryingly loud. Oil is a much better coupling medium for sound than air, so although we might expect any noise level to go down if we seal our transformer in a can, if the can is full of oil the sound level won't go down. All the same, if an open-air transformer was making that much noise I'd switch it off very quickly too.
If the no-load primary current turns out to be high then I'm afraid there is a short-circuit somewhere. If it's not so high then I fear there's something very seriously wrong with the lamination assembly. But Ed_Dinning will know a lot more about this than I do.
Cheers,
GJ