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Power Transformer
What cooling methods are used in power transformers?
Asked: January 19, 2026 at 11:31 pm by Amir Khan
- This topic has 1 reply, 2 voices, and was last updated 1 week, 2 days ago by Megan Young.
Answers
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January 19, 2026 at 11:44 pm by Megan Young
Common cooling methods include ONAN (oil natural air natural), ONAF (oil natural air forced), OFAF (oil forced air forced), and OFWF (oil forced water forced). Dry-type units use AN (air natural) or AF (air forced). Radiators, fans, oil pumps, and heat exchangers enhance heat removal and allow higher loading. Some large units use directed oil flow and internal ducts to manage winding hotspots. Cooling class is a key specification, directly influencing kVA rating and overload capacity.
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