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A comparison of the various standardized methods of partial discharge detection and measurement on electrical components, apparatus and cables indicates that, for the most part, the methods are more concerned with the detection of the presence of partial discharges rather than the determination of arbitrary discharge energy thresholds that may induce degradation and eventual breakdown of electrical insulating systems. Particular attention is given to IEEE and IEC partial discharge measurement standards and their relation and similarity to the ASTM standard. The ASTM test method is shown to constitute the basis for most other standards and existing measurement techniques, with the exception of those on rotating machines and compressed gas cables where higher frequency methods are utilized. A discussion is presented on certain advanced topics, dealing with partial discharge pulse-height and discharge epoch distribution analysis and the associated digital measurement techniques, none of which have yet attained any standardization status. In addition, a number of partial discharge site location techniques, which may have some potential for standardization, are described.
Partial discharge detection, measurement, apparent charge transfer, standard measurement procedures, partial discharge site location, pulse-height analysis, discharge pattern recognition
Institut de recherche d'Hydro-Québec, Varennes, Québec