MOTOCARETM End Winding Discharges + Corona – 210 MW, 15.75

kV Generator

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R Phase – 14000 pC Y Phase – 57.7 pC B Phase – 68.4 pC

-ve half cycle pulses (positive PD) dominate

MOTOCARETM Insulation delamination & surface contamination –

30 MW , 11 kV Generator

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+ve & -ve half cycle pulses equal, asymmetric

GTG 1 – 2410 pC GTG 6 – 69.4 pC

MOTOCARETM Poor contact between stress grading & slot corona

protection – 2.4 MW , 6.6 kV Motor

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Before overhaul – 9010 pC After overhaul – 229 pC

Equally distributed high amplitude, low repetition rate pulses