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

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

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

6 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
PublisherIEEE Computer Society
Pages328-331
Number of pages4
ISBN (Print)9781424416219
DOIs
Publication statusPublished - 2008 Jan 1
Event2008 International Conference on Condition Monitoring and Diagnosis, CMD 2008 - Beijing, China
Duration: 2008 Apr 212008 Apr 24

Publication series

NameProceedings of 2008 International Conference on Condition Monitoring and Diagnosis, CMD 2008

Conference

Conference2008 International Conference on Condition Monitoring and Diagnosis, CMD 2008
CountryChina
CityBeijing
Period08/4/2108/4/24

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

Fingerprint Dive into the research topics of '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'. Together they form a unique fingerprint.

  • Cite this

    Ohki, Y., Ishikawa, H., Morita, G., Konishi, T., Nakamichi, Y., & Tanimoto, M. (2008). 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] (Proceedings of 2008 International Conference on Condition Monitoring and Diagnosis, CMD 2008). IEEE Computer Society. https://doi.org/10.1109/CMD.2008.4580294