Advanced Warning of In-Service Stator Failure by Partial Discharge Monitor Company: Saudi Aramco Machine Description: Motor: 19,000 HP , 13.2 kV, 1800 RPM, Installed in 1979 Advanced Warning of In-Service Stator Failure Provided The 13.2kV motor was equipped with 80pF epoxy mica capacitive couplers and associated monitor. The Iris Power instrument output a 2-D plot below that illustrated extensive partial discharge activity and high magnitudes up PD of up to 800mV.The ‘hump’ in the graph is indicative of activity in the endwinding area while the high magnitude was also indicative of conductive contamination in this area. Plant Operations was alerted to shut down the unit as soon as reasonably possible to inspect the endwindings of the motor.Forensic Analysis of the Failed Motor Unfortuna

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