End Winding Discharges Detected with Partial Discharge Monitoring
End Winding Discharges Detected with Partial Discharge Monitoring
2 PagesEnd Winding Discharges Detected with Partial Discharge Monitoring Company: BC Hydro, British Columbia, Canada Machine Description: Air Cooled Hydro Generator, 239 MVA, 13.8 kV, 37 Years Old Failure Mechanism Identification Through Condition Based Monitoring: BC Hydro installed 6 epoxy mica capacitors (80pF) per phase connected to a continuous monitor measure the partial discharges on the Hydro Generator. The continuous instrument detected high magnitudes of positive and negative partial discharge activity. The hump of high partial discharge magnitude for Phase C of the machine is shown in the 2D plot in Figure 1 below: Figure 1: 2D PD Plot Showing Hump at High Magnitudes – Phase CCorrective Maintenance Prior to Machine Failure Maintenance activities were planned and implemented prior to
