Abstract
Cross-linked polyethylene polymer insulation is widely used as a raw material for insulation of cables. Polyethylene with added peroxide and silane is mostly used. Here, the mechanism of the change of the dielectric loss angle tangent was studied in the case of applying different voltages (in the range of 2-12 kV) to polyethylene samples with added silane and peroxide subjected to heat aging. Combined, i.e., the effect of both thermal aging and applied voltage on the tangent of the dielectric loss angle was investigated during measurements in the frequency range of 50-400 Hz. In the obtained results, it was observed that the value of the dielectric loss angle exceeds the effect of voltage, and the reasons for this increase are mentioned in the article. When we increase the aging period, peaks in the dielectric losses also appeared in the last periods. Also, in the article, the structural change of the insulation was studied by means of Fourier transform infrared spectra (FTIR).
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