This paper focusses on 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.Green, energy-efficient building design and operation is becoming common worldwide. This is being driven by international agreements to combat climate change, evolving countrybased standards and regulations, and increasing demand by building owners.
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