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Access type: UnknownAuthor: search.filters.author.Hengcharoensuk, Tassana

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    Investigation of Very Low Frequency Dissipation Factor of the Contaminated Underground Cable Joints
    (2020-10-25)
    Suksawat, Dusit
    ;
    Hengcharoensuk, Tassana
    ;
    Nupinit, Thanapon
    ;
    Chusang, Kittidech
    ;
    Ravangvong, Tanachot
    This paper presents the characteristics of the contaminated underground cable joints tested by a very low frequency voltage source. The underground cable system used in the experiment was comprised of a 12/20(24) kV underground cable with a cross-section area of 240 mm2, and the length of 6 m. Four different case studies were simulated on the cable joint, i.e., a healthy heat shrink cable joint (case 1), a cable joint with an incision on XLPE surface(case 2), a cable joint contaminated with 20-micron iron powder on XLPE surface(case 3), and a cable joint contaminated with 20-micron copper powder on XLPE surface(case 4). The dielectric dissipation factor, also known as tan δ at very low frequency (0.1Hz) of such underground cable systems, was examined at 0.5 U0, 1 U0, and 1.5 U0, respectively. The very low frequency(VLF) test voltage was applied to the cable specimen, according to IEEE 400.2(2013). The test voltage was recorded and analyzed. It was found that the cable joint contaminated with 20-micron iron powder on XLPE surface had a maximum tan δ. The tan δ value decreased respectively for the cable joint with an incision on XLPE surface and the cable joint contaminated with 20-micron copper powder on XLPE surface. The healthy heat shrink cable joint showed the lowest tan δ. It was clearly shown that the contaminated cable joint caused higher very low frequency tan δ compared with the healthy cable joint.
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    Dissolved gas analysis caused by electrical breakdown of liquid impregnated pressboards
    (2019-07-01)
    Pattanadech, Norasage
    ;
    Luk-In, Kanchanaporn
    ;
    Samerpak, Chantapapa
    ;
    Chumninuan, Nattakrit
    ;
    Piyapatamin, Nadpakul
    The aim of this paper is to analyze the dissolved gases in dielectric liquid caused by electrical breakdown of liquid-impregnated pressboards. The pressboards were prepared with dimension of 100 x 100 x 3.2 mm (W x L x H). First of all, each liquid insulation, mineral oil and natural ester (FR3), was heated at 60°C with 200 mbar for 12 hours. Second, pressboards were heated at 80°C with 200 mbar for 12 hours. Then the heated pressboards were impregnated with the dielectric liquid at 60°C with 200 mbar for 12 hours. The impregnated pressboards were divided into three groups. The first group was tested with AC voltage. The second and third group was tested with positive and negative lightning impulse voltages respectively. From the test results, the type and quantity of generated gases caused by breakdown phenomena is dependent on the type and the number of breakdowns.