Grading Area Discharge White Powder & Grading Paint Damaged Company: BC Hydro, Canada Machine Description: Air Cooled Hydro Generator, 457 MVA, 16 kV, 30 year old Four Iris Power PDA Epoxy Mica Couplers (EMC) per phase High Partial Discharge Levels Detected Partial discharge (PD) measurements and data analysis have been performed on BC Hydro generators for approximately over 2 decades in order to identify stator winding insulation problems through analysis of the partial discharge signal characteristics. The partial discharge patterns of this particular generator winding followed typical patterns with no polarity predominance between the positive and negative PD pulses. Also, a linear decrease in pulse density with increase in pulse magnitude was shown. In the PPA plot, the PD clouds were

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