ABSTRACT
It is well known that partial discharge (PD) events produce electromagnetic radiation with frequencies from dc to sometimes hundreds of megahertz. In addition, in complex structures such as statoi windings, the initial pulses are significantly distorted and attenuated as they propagate through a winding. The detection of the PD pulses needs to account for these effects, In particular, the bandwidth of the detection system will influence the sensitivity of the PD measurement, as well as to what portions of the winding PD can be detected. This paper summarizes over 20 years of research into these effects in stator windings, and discusses the implications for off-line and on-line PD testing, and the calibration of the PD quantities into apparent charge.
