What is the acceptable moisture content in transformer oil?

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 Peter Duncan.

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08.02.2026 at 18:31 #3786

David
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What is the acceptable moisture content in transformer oil?

08.02.2026 at 18:46 #3787

Peter Duncan
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Acceptable moisture content depends on voltage class, but for power transformers it is typically below 20-30 ppm in oil at operating temperature. Excess moisture reduces dielectric strength, accelerates paper insulation aging, and increases partial discharge risk, making moisture control a critical maintenance parameter.
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