Pulse propagation in rotating machines and its relationship to partial discharge measurements

An investigation of the pulse propagation characteristics of motor stator windings is reported. The results indicate the effects of electrical and physical length and pulse risetime on the propagation characteristics. They explain the observed phenomena and place them in the context of partial discharge measurement techniques as used to assess the integrity of solid insulating systems of a high-voltage rotating plant. Such assessments can only be correct if the discharge measurements on which they are based are accurate. The results indicate that these measurements are often not as accurate as may be assumed