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what is onan, onaf, ofan, ofaf in transformer?

Answer Posted / mick

it is the cooling method of a transformer

o = oil
n = natural means natural cooled i.e. by a radiator
a = air
f = forced means forced cooled i.e. with a fan

so an ONAN is a naturally cooled oil by natural flow of air
OFAF is oil is force cooled (heat exchanger) and the air is
forced (fans)

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