Which oil is used in transformers and why is it selected?

Tagged: answer, FAQ, oil, question, transformer, transformer oil

This topic has 1 reply, 2 voices, and was last updated 5 months, 1 week ago by Galasso Guidone.

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08.02.2026 at 11:05 #3734

Peter Duncan
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Which oil is used in transformers and why is it selected?

08.02.2026 at 11:20 #3735

Galasso Guidone
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Transformers typically use highly refined mineral insulating oil, natural ester oil, or synthetic ester oil. The oil is selected for its high dielectric strength, good thermal conductivity, chemical stability, and compatibility with solid insulation. Mineral oil remains common due to cost and proven performance, while ester oils are chosen for fire safety and environmental benefits.
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