Dielectric windows for UHF partial discharge detection

M.D. Judd, O. Farish, J.S. Pearson, B.F. Hampton

Research output: Contribution to journalArticle

84 Citations (Scopus)

Abstract

Increasing the permittivity of the propagation medium inside a hollow tube lowers its cut-off frequency, allowing it to transmit a wider range of signal frequencies. This principle is applied to the design of dielectric windows that can be used to facilitate partial discharge (PD) detection at ultra high frequency (UHF) in a HV metalclad plant such as gas-insulated substation (GIS), power transformers and circuit breakers. External UHF couplers mounted on such windows can be removed or replaced without compromising the integrity of the insulation system. By increasing the signal power level incident on a window-mounted external UHF coupler, higher sensitivity to PD can be achieved. The problem is analyzed using waveguide theory and, using GIS as an example, improvements of andap;6 dB are demonstrated by means of coupler sensitivity measurements and experiments using PD sources.
Original languageEnglish
Pages (from-to)953-958
Number of pages5
JournalIEEE Transactions on Dielectrics and Electrical Insulation
Volume8
Issue number6
DOIs
Publication statusPublished - 2001

Keywords

  • UHF measurement
  • gas insulated substations
  • insulation testing
  • dielectricity
  • electrical insulation

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