Experimental Investigation of the Effect of Transient Overvoltages on XLPE-insulated HVDC Cables
نویسندگان
چکیده
HVDC cables are subject to several types of impulses superimposed on the rated DC voltage during their service lifetime. Temporary Overvoltages (TOVs) and Superimposed Switching (SSIs) considered some most challenging due relatively long impulse duration. This paper aims at investigating experimentally effect TOVs SSIs XLPE insulation for extruded cables. 0.15-mm-thick DC-XLPE specimens, aged by applying SSIs, characterized using dielectric analyzer Fourier Transform InfraRed spectroscopy (FTIR) detect aging effects insulation. Results show an increase in imaginary part permittivity, ε", accompanied with appearance additional dipolar polarization losses peaks. The amplitude frequency aforementioned peaks vary number applied SSIs. An electrical conductivity is also noticed aging. FTIR results absorbance specimens likely intramolecular bonds rupture formation products. In summary, cause a noticeable reduction insulating properties specimens. higher peak transient, greater effect.
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ژورنال
عنوان ژورنال: IEEE Transactions on Dielectrics and Electrical Insulation
سال: 2023
ISSN: ['1070-9878', '1558-4135']
DOI: https://doi.org/10.1109/tdei.2023.3264959