Partial discharge monitoring for power transformers using UHF sensors Part 1: sensors and signal interpretation

M.D. Judd, Li Yang, I.B.B. Hunter

Research output: Contribution to journalArticle

272 Citations (Scopus)

Abstract

Determining whether power transformers are suffering from internal arcing or dangerous levels of partial discharge (PD) is important because failure without warning can result in damage to neighboring equipment, customer dissatisfaction, disruption to economic activity, and the imposition of regulatory fines. This paper provides an overview of the excitation of UHF signals by PD inside transformers. The use of externally mounted sensors has been outlined, and the structure of a dielectric window that can be constructed on an inspection hatch has been outlined. Attenuation of UHF signals propagating inside a transformer tank has been shown to be relatively low. A new approach to locating PD sources in three dimensions has been presented, based on using a numerical model of the transformer materials, which defines electromagnetic propagation velocities on a mesh of 5-cm sub-cells. The concepts of the propagation-velocity matrix (PVM) and the propagation-time matrix (PTM) were thereby introduced. Once the PD source has been located to a specific region of the transformer, the PVM might be used to index a database of physical descriptions of the transformer that could provide additional information to assist with diagnosis.
LanguageEnglish
Pages5-14
Number of pages9
JournalIEEE Electrical Insulation Magazine
Volume21
Issue number2
DOIs
Publication statusPublished - 2005

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Power transformers
Partial discharges
Monitoring
Sensors
Hatches
Numerical models
Inspection
Economics

Keywords

  • UHF detectors
  • condition monitoring
  • electromagnetic wave propagation
  • partial discharges
  • power transformers

Cite this

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Partial discharge monitoring for power transformers using UHF sensors Part 1: sensors and signal interpretation. / Judd, M.D.; Yang, Li; Hunter, I.B.B.

In: IEEE Electrical Insulation Magazine, Vol. 21, No. 2, 2005, p. 5-14.

Research output: Contribution to journalArticle

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