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    Item type:Publication,
    The Bandwidth Verification of on-site UHF Sensor for Partial Discharge Measurement
    (2022-01-01)
    Thungsook, Kittisak
    ;
    Promwong, Sathaporn
    ;
    Pattanadech, Norasage
    Partial discharge is the main problem that can lead to insulation failure or breakdown of high voltage equipment. An important and widely accepted process that can determine or ascertain partial discharge (PD) phenomena is the ultra-high frequency (UHF) method applied for monitoring HV apparatus and appraisal. This research explains the bandwidth verification of the on-site UHF sensor for partial discharge measurement. The researchers used a vector network analyzer for measuring the reflection coefficient (s11) of the UHF antenna compared to the voltage of the incident wave. In this research, 16 UHF sensors were used in the experiment. The reflection coefficient value and relevant parameters of high-frequency signals detected indicate the sensitivity and bandwidth of the antenna applied for PD detection in HV equipment. The reflection coefficient will be used as a criterion for selecting a UHF sensor type for partial discharge measurement.
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    A reflectometer using antenna mixers
    (2016-03-07)
    Inrun, R.
    ;
    Vichianchai, R.
    ;
    Leekul, P.
    ;
    Kittiyanpunya, C.
    ;
    Krairiksh, M.
    This paper presents a sensor for monitoring moisture content of paper. The reflection coefficient of paper at various moisture contents are measured and used for determining humidity of paper. The resultant IF output of 50 MHz from the reflectometer operating at the frequency of 2.40 GHz and 2.45 GHz shows an obvious difference in reflection coefficient for dry and wet paper depicting the feasibility to design a moisture content sensor.