高压直流电缆用LDPE/EPDM复合绝缘材料的性能研究  

Study on Properties of LDPE/EPDM Composite Insulation Materials for HVDC Cables

作　　者：朱海超[1] ZHU Hai-chao(State Grid Nanjing Power Supply Company,Nanjing 210013,Jiangsu,China)

机构地区：[1]国网南京供电公司,江苏南京210013

出　　处：《合成材料老化与应用》2021年第4期89-92,101,共5页Synthetic Materials Aging and Application

摘　　要：为改性高压直流电缆与复合介质之间的空间电荷积聚,规避绝缘击穿的问题,采用开炼式熔融共混法和热压成型方法制备LDPE/EPDM复合绝缘材料,探究表层分子结构改性对LDPE/EPDM界面电荷性能的调控机理及规律。结果表明,经过表层分子改性的LDPE/EPDM电荷积聚性能有明显改善,但是受改性时间和试样匹配的影响,其呈现先上升后下降的趋势,存在既定的临界值,由此引致的电场畸变性存在显著差异。该结论对于LDPE/EPDM复合绝缘材料性能的优化设计具有指引作用。In order to improve the space charge accumulation between high voltage DC cable and composite medium and avoid insulation breakdown,LDPE/EPDM composite insulation materials were prepared by open melt blending method and hot pressing method,and the regulation mechanism and law of surface molecular structure modification on LDPE/EPDM interface charge performance were explored.The results show that the charge accumulation performance of LDPE/EPDM modified by surface molecules is obviously improved.However,affected by the modification time and sample matching,the charge accumulation performance of LDPE/EPDM composites increases first and then decreases,and there is a certain critical value.The electric field distortion caused by this phenomenon is significantly different.This conclusion has a guiding role in the optimization design of LDPE/EPDM composite insulation materials.

关 键 词：高压直流电缆 电荷性能 双层介质界面 LDPE/EPDM 

分 类 号：TM247[一般工业技术—材料科学与工程]