Sensors for measurement of moisture diffusion in power cables with oil-impregnated paper

Zachary M. Thomas, Markus Zahn, Wuqiang Yang

    Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review


    Some old power cables use oil-impregnated paper as the insulation material, which is enclosed by a layer of lead sheath. As cracks can form on the sheath of aged cables, the oil-impregnated paper can be exposed to the environmental conditions, and ambient moisture can diffuse into the paper through the cracks, causing a reduced breakdown voltage. To understand this diffusion phenomenon, multi-wavelength dielectrometry sensors have been used to measure permittivity and conductivity, aiming to obtain information on the moisture content. Different electrode-grouping strategies have been suggested to obtain more detailed information. Effectively, an electrode-grouping approach forms a type of electrical capacitance tomography sensor. This paper presents different sensor designs together with a capacitance measuring circuit. Some analytical results are also presented. © 2007 IOP Publishing Ltd.
    Original languageEnglish
    Title of host publicationJournal of Physics: Conference Series|J. Phys. Conf. Ser.
    PublisherIOP Publishing Ltd
    Publication statusPublished - 1 Sept 2007
    EventSensors and their Applications XIV - Liverpool, UK
    Duration: 11 Sept 200713 Sept 2007


    ConferenceSensors and their Applications XIV
    CityLiverpool, UK


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