Partial Discharge Measurements in Synchronous Generators

This chapter addresses the subject of PD measurements in synchronous generators. We begin by presenting the PD types generally found in that kind of generators as well as the common stator isolation faults. Then, an overview on methods and systems for PD measurement is given. Next, measurements in the field, performed in hydroelectric power plants, are presented and discussed. We also detail a complex study on PD monitoring, carried out during commissioning tests of a new hydrogenerator, i.e., our PD measurements ran parallel the first machine excitation, synchronism procedures, and operating range and heating tests. The study is concluded with PD measurements performed after 2 months of commercial operation of the machine.