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After retrofilling a transformer, what fire safety concerns should remain due to residual mineral oil?

April 26, 2017concerns fire safety Mineral Oil remain residual retrofilling transformer

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After retrofilling a transformer, what fire safety concerns should remain due to residual mineral oil?

1 Answer

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As incredible as it seems, even with a contamination of up to 7.5% mineral oil, FR3 fluid key properties remain unaffected and maintains a fire point of over 350 C, including maintaining a fire point rating of over 350C (Proper retrofilling should result in less than 5% residual mineral oil).