Partial discharge measurements on individual stator coils and bars

In 2014 the second edition of IEEE Std 1434 Guide for the Measurement of Partial Discharges in AC Electric Machinery was approved. This guide includes possible on-line and off-line PD measurements on complete stator windings as well as on individual stator coils and bars. It was agreed that further work would be initiated with the objective of developing a recommended practice for PD measurements on coils and bars that might ultimately result in the establishment of pass/fail criteria. This paper reviews some of the alternative methods that are being considered.