Influence of Leakage Magnetic Fields on Partial Discharge Activity in Power Transformers Articles uri icon

publication date

  • December 2010

start page

  • 1724

end page

  • 1730

issue

  • 6

volume

  • 17

international standard serial number (ISSN)

  • 1070-9878

electronic international standard serial number (EISSN)

  • 1558-4135

abstract

  • Partial discharges are a clear ageing agent on insulating materials used in high voltage electrical machines. For this reason, there is increasing interest in measuring this phenomenon in an effort to
    forecast unexpected failures in electrical equipment. Despite the fact
    that normalized tests have been carried out for years, the effect of
    leakage magnetic fluxes in transformers and rotating machines stator
    windings has not yet been considered. The authors show that common stray
    fluxes in typical high voltage machines modify partial discharge
    activity, so the interaction between ionization processes and magnetic
    fields is analysed. This might have a clear effect on the results
    extracted from on-line and off-line partial discharge measurements.