Proceedings of 1998 International Symposium on Electrical Insulating Materials. 1998 Asian International Conference on Dielectr
DOI: 10.1109/iseim.1998.741785 View full text |Buy / Rent full text
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Abstract: This paper presents the results of test procedures aiming at electrical characterization of polymeric materials for DC-insulation application. Electrical life tests at room temperature and space-charge observations were performed on specimens of two materials, i.e. a reference XLPE and a XLPE-based compound, with the purpose to compare the behavior under both constant and periodically-inverted DC voltage. The compound differs from the base material for the introduction of additives having the purpose to modify… Show more

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“…The other life model parameter values are R=10 μm and U 0 =0.7 eV. The values of breakdown times (in hours) as a function of poling field, obtained for XLPE # 2 at room temperature (circles) [13], are compared in Figure 13 Finally, long-term life tests relevant to HVDC cables have been considered. These tests, characterized by a time length of about 260 days, were carried out at the Yokosuka research centre (Japan) by applying to full-size XLPE-insulated HVDC cables a full loading cycle, including several voltage and temperature levels (see [12] for details).…”
Section: Fitting Of the Model To Experimental Results Of Life Testsmentioning
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“…The other life model parameter values are R=10 μm and U 0 =0.7 eV. The values of breakdown times (in hours) as a function of poling field, obtained for XLPE # 2 at room temperature (circles) [13], are compared in Figure 13 Finally, long-term life tests relevant to HVDC cables have been considered. These tests, characterized by a time length of about 260 days, were carried out at the Yokosuka research centre (Japan) by applying to full-size XLPE-insulated HVDC cables a full loading cycle, including several voltage and temperature levels (see [12] for details).…”
Section: Fitting Of the Model To Experimental Results Of Life Testsmentioning
“…the electron-impact ionization coefficient of air, function -as illustrated by equations (13) and (14) of [1], after [2,3] -of the electric field inside the void, E V ), d is the height (along the direction of E) of the gasfilled cylindrical microvoid and R the radius of its circular basis, of surface S (see Figure 1 of [1]), d C is the critical size of the damaged zone (i.e. an extension along the field direction large enough for starting a rapid failure mechanism).…”
Section: Theoretical Modelmentioning