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Subject: search.filters.subject.Impregnated pressboard

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    Frequency Domain Spectroscopy of Pressboard Impregnated with Natural Ester under Thermal Stress
    (2022-01-01)
    Chumpiboon, K.
    ;
    Vittayakorn, W.
    ;
    Kittikhuntharadol, Y.
    ;
    Maneerot, S.
    ;
    Pattanadech, N.
    One of the most popular insulating liquids is mineral oil, which is used in many high-voltage apparatuses, especially in transformers. For a few decades, the concept of the use of alternative insulating liquids has been presented. Natural ester is a vegetable-based insulating liquid. Pressboard is a type of electrical insulation paper made of cellulose. Frequency Domain Spectroscopy (FDS) has been used to assess the insulation characteristics such as oil-impregnated paper. In this paper, the FDS of pressboard impregnated with natural ester under thermal stress and pressboard impregnated with natural ester were studied. In the experiment, the pressboard test specimens were heated at 100 degrees Celsius in a vacuum oven for 48 hours to reduce the moisture. Then, the test specimens were impregnated with natural ester for 0, 8, 16, and 24 hours. After that, they were simulated with thermal stress by heating at 150 degrees Celsius in a vacuum oven for 0, 30, and 90 days. To analyze their dielectric integrity, FDS was performed by DIRANA. The test cell for solid insulation testing, according to JIS C2111 was prepared and used for the FDS experiment. The result shows that the characteristics of the natural ester-impregnated pressboard that had been subjected to thermal stress were slightly different when compared with the same impregnation time of the pressboard.
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    Ac and lightning impulse breakdown voltage of natural ester impregnated pressboards
    (2020-10-25)
    Siriworachanyadee, Jompatara
    ;
    Pattanadech, Norasage
    The paper represents AC and lightning impulse (positive and negative impulse) breakdown voltage characteristics of natural ester impregnated pressboards with different impregnation period. The pressboard specimen was prepared as a rectangular shape (the length and the width are 120 mm as well) and thickness dimension of the pressboard in the experiment was approximately 1.6 mm. The pressboards were dried up in the vacuum oven with temperature at 80°C for 12 hours under 200 mbar pressure. In addition, these pressboards were divided into 3-group according to the impregnation periods. The 1st group, the pressboards were impregnated with natural ester at 60°C for 8 hours under 200 mbar pressure. The 2nd and 3rd group, the pressboards were impregnated at 60°C for 16 and 24 hours, respectively, under 200 mbar pressure-controlled conditions. The plane-plane electrodes inserted with the specified number of the pressboard specimens were prepared. These electrodes were installed in the test cell filled with the natural ester. A 24 kV AC Voltage was applied to the test cell for 3 months. At the end of the first month, half of the pressboard samples was token from the test cells. Then, the AC breakdown voltage and impulse breakdown voltage characteristics of the impregnated pressboard were investigated in accordance with IEC 60243-1 and IEC 60243-3, respectively. At the end of the third month, another half of the pressboard samples was token from the test cells to perform AC and lightning impulse breakdown voltage test also. From the test results, all pressboards which are impregnated for a long period provided higher AC breakdown voltage than the pressboard which are impregnated for a short period. In the other hand, the impulse breakdown voltage values of each condition are not very different. Obviously, the period for impregnation significantly affects the AC breakdown characteristic of the natural ester impregnated pressboard. On the otherwise, it is not affecting the impulse breakdown characteristic of the natural ester impregnated pressboard.
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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.
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    Dielectric properties of mineral oil compared with natural ester
    (2017-11-29)
    Jariyanurat, K.
    ;
    Nimsanong, P.
    ;
    Chaisiri, P.
    ;
    Maneerot, S.
    ;
    Kitcharoen, P.
    In this paper, dielectric properties of the mineral oil, ELECTROL A, and the natural ester, FR3, are comparatively investigated. AC breakdown voltages, dielectric dissipation factor, relative permittivity, partial discharge inception voltage and partial discharge of the mineral oil and of the natural ester are tested. In order to verify the capability in practical use of the mineral oil and the natural ester for transformer insulation systems, the impregnation of such liquids with pressboard insulation is performed. The impregnated pressboards are tested in the laboratory to measure the AC breakdown voltages. It is found that the natural ester shows superior dielectric properties to the mineral oil except the dielectric dissipation factor.