PD-pulse characteristics in rotating machine insulation

Joachim Holbøll, Mogens Henriksen, A Jensen, F. Sørensen

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    In this paper results are presented from investigations on partial discharges (PD) in insulation systems, resembling the stator insulation in high voltage rotating machines. A model, simulating a stator winding in a slot, has been developed, consisting of simple rotating machine insulation test bars with epoxy/mica insulation, mounted between steel sheets forming a dot, in order to investigate the fundamental behaviour of PD in insulation defects in epoxy/mica insulation and the characteristics of the resulting electrical pulses. Stator slot couplers (SSC) were used to detect pulses coming from artificial defects implemented in the model as well as from the existing voids in the test bars' insulation. Some characteristic pulse shapes were found, which could be related partly to the defect type. The high frequency detection method, with directional couplers, made it possible to localize the defects thereby determining the pulse distortion in the chosen geometry. The influence of some parameters was investigated, such as the voltage applied, the location of the defect with respect to the sensor and the orientation of the defect in the slot. This information is essential for PD-detection systems where the noise/signal separation is based on the pulse shape, such as the SSC-technology used in the present investigations
    Original languageEnglish
    Title of host publicationConference Record of the IEEE International Symposium on Electrical Insulation
    Publication date1994
    ISBN (Print)07-80-31942-7
    Publication statusPublished - 1994
    Event1994 IEEE International Symposium on Electrical Insulation - Pittsburgh, PA, United States
    Duration: 5 Jun 19948 Jun 1994


    Conference1994 IEEE International Symposium on Electrical Insulation
    Country/TerritoryUnited States
    CityPittsburgh, PA
    Internet address

    Bibliographical note

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