High PD Activity in Unit 3 Noxon Rapids Became Low After Rewinding
High PD Activity in Unit 3 Noxon Rapids Became Low After Rewinding
3 PagesHigh PD Activity in Unit 3 Noxon Rapids Became Low After Rewinding Company: Avista Utilities Machine Description: Hydraulic Generator, 108 MW, 13.8 kV Installed in 1959 and rewound in 1975, 1983 and 2004 Two Bus Couplers per phase High Partial Discharge Activity in Unit 3 Noxon Rapids Became Low After Rewinding In 1998, partial discharge measuring equipment was installed as part of the control/monitoring systems upgrade. This consisted of two capacitive couplers on each phase connected to a HydroTrac continuous on-line monitoring system. When commissiong the system, engineers from Iris remarked that Unit 3 had some of highest partial discharge activity they had ever seen. Avista used data supplied by the partial discharge equipment to track stator winding condition. Partial discharge remai
