Development of UHF transformer probe sensors for on-line partial discharge measurement

Alistair Reid, Martin Judd, Carl Johnstone

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


    This paper reports on the design and testing of a new UHF transformer probe sensor which is robust in terms of its mechanical design as well as possessing high electrical sensitivity. Mechanical design and practical safety considerations relating to on-site installation are addressed. The frequency response of the probe has been compared to that of a commercially available sensor. Sensor response has been fully characterised in terms of sensitivity with respect to mounting depth relative to the transformer tank wall. This was achieved using a pulsed GTEM transient calibration cell with a specially designed transformer valve mounting plate. The new UHF probe sensor was found to achieve the minimum recommended sensitivity of 2 mm mean effective height at 0 mm insertion relative to the tank wall. The reference probe achieves the same sensitivity at a depth of 27 mm. This significant improvement in sensitivity should increase the signal-to-noise ratio of any recorded data and improve the detection rate of any incipient failures.
    Original languageEnglish
    Title of host publication2009 44th International Universities Power Engineering Conference (UPEC)
    Number of pages4
    ISBN (Electronic)978-0-947649-44-9
    ISBN (Print)978-1-4244-6823-2
    Publication statusPublished - Sep 2009


    • probes
    • partial discharge measurement
    • mechanical sensors
    • sensor phenomena and characterization
    • testing
    • robustness
    • safety
    • frequency response
    • pulse transformers
    • calibration


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