摘要
为研究高压直流电缆附件用三元乙丙橡胶(EPDM)与交联聚乙烯(XLPE)电气性能的匹配关系,本文制备了3种高压直流电缆用EPDM材料,测试XLPE和EPDM的电导率和电气强度,以及XLPE/EPDM双层介质的空间电荷和电气强度。结果表明:EPDM-1#电导率低于XLPE,EPDM-2#电导率与XLPE相当,EPDM-3#电导率高于XLPE。当EPDM电导率低于XLPE时,界面电荷为正极性;当EPDM电导率近似等于XLPE时,鲜有界面电荷积累;当EPDM电导率高于XLPE时,界面电荷为负极性。XLPE/EPDM双层介质的电气强度取决于其自身电导率和电气强度,若要达到更好的匹配效果,要求双层介质内部的电场强度之比等于二者的电导率之比。
In order to study the electrical performance matching relationship between EPDM and XLPE for HVDC cable accessories,three kinds of EPDM materials for HVDC cable were prepared,and the electrical conductivity and electric strength of XLPE and EPDM,as well as the space charge and electric strength of XLPE/EPDM double layer medium were tested.The results show that the conductivity of EPDM-1#is lower than that of XLPE,the conductivity of EPDM-2#is equivalent to that of XLPE,and the conductivity of EPDM-3#is higher than that of XLPE.When the conductivity of EPDM is lower than that of XLPE,the interface charge is positive polarity.When the conductivity of EPDM is approximately equal to that of XLPE,there is few interface charges accumulated.When the conductivity of EPDM is higher than of XLPE,the interface charge is negative polarity.The electric strength of XLPE/EPDM double layer medium depends on its own conductivity and electric strength.To achieve a better matching effect,the ratio of electric field intensity inside the double layer medium should be equal to the ratio of conductivity of the two.
作者
刘淑军
吴启仁
李栋
朱智恩
吕鹏远
胡德芳
刘宇
陈露露
LIU Shujun;WU Qiren;LI Dong;ZHU Zhien;LÜPengyuan;HU Defang;LIU Yu;CHEN Lulu(China Three Gorges New Energy(Group)Co.,Ltd.,Beijing 101199,China;State Grid Electric Power Research Institute Co.,Ltd.,Nanjing 211106,China)
出处
《绝缘材料》
CAS
北大核心
2022年第12期75-79,共5页
Insulating Materials
基金
中国长江三峡集团有限公司科研项目(201903066)
中国三峡新能源(集团)股份有限公司科研项目(三峡新能源合字[2020]91号)。
