Improved Insulation Properties of Polypropylenes in HVDC Cables Using Aqueous Suspension Grafting |
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| Authors: | Yiyi Zhang Keshuo Shi Chunyan Zang Wenchang Wei Chuanhui Xu Junwei Zha |
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| Affiliation: | 1.Guangxi Key Laboratory of Intelligent Control and Maintenance of Power Equipment, Guangxi University, Nanning 530004, China;2.College of Electical and Electronics Engineering, Huazhong University of Science and Technology, Wuhan 430074, China;3.School of Chemistry and Chemical Engineering, Guangxi University, Nanning 530004, China;4.School of Chemistry and Biological Engineering, University of Science and Technology Beijing, Beijing 100083, China |
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| Abstract: | Owing to its lack of crosslinking, polypropylene (PP) is considered an environmentally friendly alternative to crosslinked polyethylene as high-voltage direct current (HVDC) cable insulation. However, pure PP can accumulate space charges under a HVDC, and thus must be modified for use as an insulating material for HVDC cables. In this study, 4-methylstyrene is grafted onto PP using an aqueous suspension grafting method to improve its properties. The effects of the swelling time, reaction time, and 4-methylphenylene concentration on the reaction were investigated. The optimum process conditions were determined, including an optimum grafting ratio of 0.97%. The volume resistivity, ability to suppress space-charge accumulation, and DC breakdown strength of modified PP were also studied. Modified PP with a grafting ratio of 0.88% showed optimal space-charge suppression and the highest volume resistivity and breakdown strength. The work will facilitate the design and development of more efficient insulation materials for HVDC cables. |
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| Keywords: | aqueous suspension grafting polypropylene HVDC cable insulation DC breakdown strength space-charge suppression 4-methylphenylene |
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