Frequency Dependent PD-pulse Distortion in Rotating Machines

Joachim T. Holbøll, Mogens Henriksen

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    In this contribution, the authors present results from investigations on the distortion of PD pulses in the stator winding of a 10 kV asynchronous motor. In order to determine the distortion of PD pulses from different, well defined parts in the winding, the following two techniques were used simultaneously: (a) ultra wide band detection in the frequency range of 20-400 MHz by means of stator slot couplers under the stator wedges, in order to localize and quantify the discharges; and (b) high frequency measurements in the frequency range of 1-100 MHz by means of high frequency current transformers at the machine terminals. The results show a variation of the attenuation of the discharge pulses inside the machine of about 20 dB highest for pulses from the far end, i.e. the neutral point. The capability of exact localization of the discharges in the winding gives a correct measure of the range of the current transformer based detection method, when being applied to rotating machines. The results are discussed with regard to the practical application of PD detection systems on rotating machines, particularly considering aspects of range and applicability of systems in the HF ranges
    Original languageEnglish
    Title of host publicationConference Record of The 1996 IEEE International Symposium on Electrical Insulation
    Place of PublicationPitscatasway
    Publication date1996
    ISBN (Print)0-7803-3531-7
    Publication statusPublished - 1996
    Event1996 IEEE International Symposium on Electrical Insulation - Montreal, Quebec, Canada
    Duration: 16 Jun 199619 Jun 1996


    Conference1996 IEEE International Symposium on Electrical Insulation
    CityMontreal, Quebec

    Bibliographical note

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