26220998963_pd_case_studies
Post on 18-Jan-2016
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MOTOCARETM End Winding Discharges + Corona – 210 MW, 15.75
kV Generator
www.diatechindia.com
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
www.diatechindia.com
+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
www.diatechindia.com
Before overhaul – 9010 pC After overhaul – 229 pC
Equally distributed high amplitude, low repetition rate pulses
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