Abstract
Polypropylene (PP) receives significant interests because of environmental friendship and excellent insulation. The development of PP cables depends heavily on the semi-conductive shielding layers that match the PP insulation layers. In this paper, propylene–ethylene copolymer (POP) is used to toughen the PP-based shielding layer. The effects of POP content (40 parts, 50 parts and 60 parts) on the electrical and mechanical characteristics are investigated. Further, the interface matching characteristics and toughening mechanism of the shielding layer are explored. According to the experimental findings, owing to the growth in POP content, the distribution of carbon black (CB) particles becomes more uniform, and the surface roughness decreases from 52.7 nm to 14.7 nm. When the POP content is 60 parts, the charge injected into the insulation layer is the least, which is 0.643 × 10−7 C, and the maximum electric field distortion decreases to 11.4 kV/mm. All three POP content shielding layers maintain a low resistivity at high temperatures (110 ℃, 80 Ω·cm). Besides, as the POP content increases, the toughness of PP-based shielding layer is improved and the elongation at break of POP-60 semi-conductive shielding layer reaches 420%. This research paves a new way for the development of semi-conductive shielding layer of PP cables.
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Acknowledgements
This work was supported in part by the National Natural Science Foundation of China (Grant No. 52107154). Youth Innovation Technology Project of Higher School in Shandong Province (Grant No. 2021KJ023). State Grid Shandong Electric Power Company Science and Technology project (No. 52062621N003).
Funding
This work was supported in part by the National Natural Science Foundation of China (Grant No. 52107154). Youth Innovation Technology Project of Higher School in Shandong Province (Grant No. 2021KJ023). State Grid Shandong Electric Power Company Science and Technology project (No. 52062621N003).
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YW was involved in investigation, experiments, analysis. LL helped in data curation. TL contributed to IR experiment. XL was involved in investigation. YD helped in investigation. CH contributed to conceptualization, investigation, review. GL helped in conceptualization. Shengtao Li contributed to conceptualization.
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Wei, Y., Liu, L., Liu, T. et al. Electrical and mechanical properties of POP-toughening semi-conductive shielding layer for PP cables. Electr Eng 106, 315–322 (2024). https://doi.org/10.1007/s00202-023-01986-1
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DOI: https://doi.org/10.1007/s00202-023-01986-1