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Case study: Misleading line frequency insulation results on a contaminated transformer

Case study: Misleading line frequency insulation results on a contaminated transformer

A 1978 vintage, 20 MVA, 69/13.09 kV, Dyn1 transformer, operating for a major North American utility, was taken out of service to repair a pump in the cooling system. The technical maintenance team completed the required repairs and conducted a complete protocol of routine commissioning tests, including a 10 kV line frequency (LF) power factor (PF) test.

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