Discussion
A transformer designated ONAN is cooled by
Answer: D
Correct answer: natural oil circulation and natural air circulation
The four-letter code names the internal medium and its circulation followed by the external medium and its circulation. ONAN is oil, natural circulation, air, natural circulation - thermosiphon flow through the radiators with no pumps or fans. Adding fans gives ONAF and adding oil pumps as well gives OFAF, each step increasing the rating of the same unit.
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