Delay of OEM Recommended Rewind by Using On-Line PD Testing Company: Kansas City Power and Light, Montorose Machine Description: Turbine Generator, 22kV, 221 MVA Asphaltic mica insulation, first operated September 1960 80pF EMCs, 2 per phase, installed 1994 CASE STUDY: Delay of OEM Recommended Rewind by Using On-Line PD Testing In 1994, Montrose Unit 2 was taken out of service and the OEM recommended a rewind. The utility decided against the recommended rewind at that time and installed 80pF Bus Couplers to facilitate PD testing. Testing results since 1998 shows rapid deterioration of the C phase windings, specifically Phase C (winter operations) shows very high and unstable PD activity. This is an indication of loose coils, poor semi-conductive coating, causing surface discharge between s

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