Separation of sources in radiofrequency measurements of partial discharges using time-power ratio maps Articles uri icon

publication date

  • September 2015

start page

  • 389

end page

  • 397

volume

  • 58

international standard serial number (ISSN)

  • 0019-0578

electronic international standard serial number (EISSN)

  • 1879-2022

abstract

  • Partial discharges measurement is one of the most useful tools for condition monitoring of high-voltage (HV) equipment. These phenomena can be measured on-line in radiofrequency (RF) with sensors such as the Vivaldi antenna, used in this paper, which improves the signal-to-noise ratio by rejecting FM and low-frequency TV bands. Additionally, the power ratios (PR), a signal-processing technique based on the power distribution of the incoming signals in frequency bands, are used to characterize different sources of PD and electromagnetic noise (EMN). The calculation of the time length of the pulses is introduced to separate signals where the PR alone do not give a conclusive solution. Thus, if several EM sources could be previously calibrated, it is possible to detect pulses corresponding to PD activity. (C) 2015 ISA. Published by Elsevier Ltd. All rights reserved.

keywords

  • classification