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Electrical Applications 2 by David W. Tyler

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70 Transformers
Oil conservator tank
Part section XX
Two alternative cooling tube arrangements on an
oil-natural air cooled transformer
Figure 5.10
Transformers suffer eddy current and hysteresis losses in their cores
and copper losses (PR) in their windings. The heat generated must
be removed or eventually the transformer will become hot enough to
For the smaller ratings, natural air cooling is sufficient. The
transformer is surrounded by air and, due to the heat produced,
convection currents of air are created which carry the heat away.
Provided that free passage of air can be maintained, all will be well.