Hindered phenolic antioxidant grafting on tailoring the DC electrical characteristics of polypropylene cable insulation  

作　　者：Boxue Du Guoning Sun Heyu Wang Zhonglei Li 

机构地区：[1]The Key Laboratory of Smart Grid of Ministry of Education,School of Electrical and Information Engineering,Tianjin University,Tianjin,China

出　　处：《High Voltage》2024年第5期971-980,共10页高电压（英文）

基　　金：National Natural Science Foundation of China,Grant/Award Numbers:52077148,U1966203;Key Science and Technology Program of Yunnan Province,China,Grant/Award Number:202202AC080002。

摘　　要：The authors focus on the impact of melt-free radical grafting with hindered phenolic antioxidants(AO3052)on the electrical properties of polypropylene(PP)for DC cable insulation.The DC conductivity,space charge distribution and breakdown characteristic tests of grafting-modified PP are performed by comparing unmodified PP.The results demonstrate that the grafting of antioxidants can effectively suppress space charge injection,owing to the deeper trap sites at the grafting molecule.The breakdown strength of the grafted PP is significantly enhanced from 30°C to 90°C and especially achieves a 5.3%-6.7%increase after the same DC-prestressed time at 90°C.The surface electrostatic potential and molecular orbitals of the grafted PP are calculated.Simulation shows that the antioxidant introduces multi-level local state traps that can effectively trap the injected space charge,thus decreasing the destruction of molecular chains by electrons and increasing the breakdown strength level.In conclusion,antioxidant grafting modification can improve the breakdown characteristics with or without DC prestress,and thus it appears to be promising in the application of PP-insulated cables.

关 键 词：GRAFTING INSULATION PHENOLIC 

分 类 号：TM246[一般工业技术—材料科学与工程]