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epri 93 - experience with on-line partial discharge testing of motors ...

epri 93 - experience with on-line partial discharge testing of motors ...

Case Study 6 - Old 450

Case Study 6 - Old 450 MVA Turbine Generator At the Florida Power & Light Riviera plant, the 350 MVA turbine generator is of the same vintage and manufacturer as the unit in Case Study 5. Six SSCs were installed and some of the data is plotted in Figure 9. The PD activity is over 30 times higher on this generator than the worst phase in the similar Turkey Point generator. At the time of the SSC installation loose wedges, loose windings, and greasing were present indicating relative movement. The endwinding was then cleaned and the wedges tightened. However, the high PD activity indicates that problems may still be present. Further investigation of this winding, including trending of the PD activity over time, is planned. As is consistent ong>withong> PDA results on hydrogenerators ong>withong> slot discharge, the positive PD is more than two times higher than the negative PD. 14

Figure 9 PD activity ong>withong> the Riviera unit operating at 365 MW. 15

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