Trend of Qm Percentile Rankings 1997-2021 – Paper

Published Jul 11th, 2022 IRMC 2022 - Vicki Warren

It has long been known that comparing the partial discharge results obtained  from a single machine is a valuable tool enabling companies to observe the gradual deterioration of a machine stator winding and thus plan appropriate maintenance for the machine [1]. In 1998, at the annual Iris Rotating Machines Conference (IRMC), a paper was presented that compared thousands of partial discharge (PD) test results to establish the criteria for comparing results from different machines and the expected PD levels [2]. At subsequent annual Iris conferences, using similar analytical procedures, papers were presented that supported and expanded upon the previous criteria [6 – 21]. This paper presents the trends and averages of all of these papers.


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