Abstract
Power transformers up to 600 MVA, in a single unit weighing 350 tons, have been built for modern generating stations. Auto-transformers up to 750 MVA have been constructed for the 400 kV grid. These large units, shortly to be commissioned, will operate at efficiencies of 99.8 to 99.9 %. A minute fraction ( ~ 10~ 6 ) of the total loss of I to 2 MW is radiated as sound. The octave-band levels near such a transformer exceed the hearing damage criterion recommended by Burns (1965) for regular 8 h exposure (figure 1), but fortunately transformers do not require a driver!
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Schedule a callMore From: Philosophical Transactions of the Royal Society of London. Series A, Mathematical and Physical Sciences
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