Role of the voltage zero-crossing in the growth of water trees - Effect of superposition method of a high-frequency voltage and a low-frequency voltage

Yoshimichi Ohki, H. Ishikawa, G. Morita, T. Konishi, Y. Nakamichi, M. Tanimoto

    Research output: Chapter in Book/Report/Conference proceedingConference contribution

    5 Citations (Scopus)

    Abstract

    The authors have examined the effects of superposition of a low-frequency ac voltage and a high-frequency ac voltage on the growth of water trees in polyethylene, and have made it clear that the number of voltage zero-crossings is a decisive factor of water tree growth. In the present research, a short-duration high-frequency (2 kHz) voltage was superposed repeatedly onto a continuously applied low-frequency (0.5, 1.0, 3.0 or 5.0 Hz) voltage in synchronous with the low-frequency voltage either at its positive and negative maxima or at each zero-crossing point. By applying such superposed voltages to a low-density polyethylene sheet with a water needle electrode and a counter plane electrode, the length of a grown water tree was evaluated. As a result, it has become clear that the water tree length is longer when the high-frequency voltage is superposed at each zero-crossing point of the low-frequency voltage. This result supports the above-mentioned assumption that the number of voltage zero-crossings plays a significant role in the growth of water trees.

    Original languageEnglish
    Title of host publicationProceedings of 2008 International Conference on Condition Monitoring and Diagnosis, CMD 2008
    Pages328-331
    Number of pages4
    DOIs
    Publication statusPublished - 2007
    Event2008 International Conference on Condition Monitoring and Diagnosis, CMD 2008 - Beijing
    Duration: 2008 Apr 212008 Apr 24

    Other

    Other2008 International Conference on Condition Monitoring and Diagnosis, CMD 2008
    CityBeijing
    Period08/4/2108/4/24

    Fingerprint

    Electric potential
    Water
    Electrodes
    Low density polyethylenes
    Needles
    Polyethylenes

    Keywords

    • Aging
    • Cable insulation
    • Fault diagnosis
    • Insulation
    • Insulation life
    • Power cables
    • Space charge
    • Trees (insulation)

    ASJC Scopus subject areas

    • Industrial and Manufacturing Engineering
    • Safety, Risk, Reliability and Quality

    Cite this

    Ohki, Y., Ishikawa, H., Morita, G., Konishi, T., Nakamichi, Y., & Tanimoto, M. (2007). Role of the voltage zero-crossing in the growth of water trees - Effect of superposition method of a high-frequency voltage and a low-frequency voltage. In Proceedings of 2008 International Conference on Condition Monitoring and Diagnosis, CMD 2008 (pp. 328-331). [4580294] https://doi.org/10.1109/CMD.2008.4580294

    Role of the voltage zero-crossing in the growth of water trees - Effect of superposition method of a high-frequency voltage and a low-frequency voltage. / Ohki, Yoshimichi; Ishikawa, H.; Morita, G.; Konishi, T.; Nakamichi, Y.; Tanimoto, M.

    Proceedings of 2008 International Conference on Condition Monitoring and Diagnosis, CMD 2008. 2007. p. 328-331 4580294.

    Research output: Chapter in Book/Report/Conference proceedingConference contribution

    Ohki, Y, Ishikawa, H, Morita, G, Konishi, T, Nakamichi, Y & Tanimoto, M 2007, Role of the voltage zero-crossing in the growth of water trees - Effect of superposition method of a high-frequency voltage and a low-frequency voltage. in Proceedings of 2008 International Conference on Condition Monitoring and Diagnosis, CMD 2008., 4580294, pp. 328-331, 2008 International Conference on Condition Monitoring and Diagnosis, CMD 2008, Beijing, 08/4/21. https://doi.org/10.1109/CMD.2008.4580294
    Ohki Y, Ishikawa H, Morita G, Konishi T, Nakamichi Y, Tanimoto M. Role of the voltage zero-crossing in the growth of water trees - Effect of superposition method of a high-frequency voltage and a low-frequency voltage. In Proceedings of 2008 International Conference on Condition Monitoring and Diagnosis, CMD 2008. 2007. p. 328-331. 4580294 https://doi.org/10.1109/CMD.2008.4580294
    Ohki, Yoshimichi ; Ishikawa, H. ; Morita, G. ; Konishi, T. ; Nakamichi, Y. ; Tanimoto, M. / Role of the voltage zero-crossing in the growth of water trees - Effect of superposition method of a high-frequency voltage and a low-frequency voltage. Proceedings of 2008 International Conference on Condition Monitoring and Diagnosis, CMD 2008. 2007. pp. 328-331
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    AB - The authors have examined the effects of superposition of a low-frequency ac voltage and a high-frequency ac voltage on the growth of water trees in polyethylene, and have made it clear that the number of voltage zero-crossings is a decisive factor of water tree growth. In the present research, a short-duration high-frequency (2 kHz) voltage was superposed repeatedly onto a continuously applied low-frequency (0.5, 1.0, 3.0 or 5.0 Hz) voltage in synchronous with the low-frequency voltage either at its positive and negative maxima or at each zero-crossing point. By applying such superposed voltages to a low-density polyethylene sheet with a water needle electrode and a counter plane electrode, the length of a grown water tree was evaluated. As a result, it has become clear that the water tree length is longer when the high-frequency voltage is superposed at each zero-crossing point of the low-frequency voltage. This result supports the above-mentioned assumption that the number of voltage zero-crossings plays a significant role in the growth of water trees.

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