Development of a recommended practice for the Measurement of PD from stator coils and bars

During the recent revision of IEEE 1434 Guide for the Measurement of Partial Discharges in AC Electric Machinery it became apparent that there is interest in developing a recommended practice for the measurement of PD from individual stator coils and bars. This would include measurements in the low frequency bandwidth specified by IEC 60270 as well as other bandwidths. To facilitate the work sample stator coils and bars with known defects as well as ones in good condition are required. The samples should be of moderate size to assist in the shipment of the samples between various laboratories for round robin testing. The measurements should determine the effect of conditioning and should also include measurements of insulation power factor and tip-up according to IEEE 286.