预处理温度对高压直流电缆附件绝缘材料空间电荷的影响  

Influence of Pretreating Temperature on Space Charge of Insulation Materials for Cable Accessories Used in HVDC Transmission Projects

作　　者：王俏华[1] 顾金[1] 吴建东[1] 尹毅[1] 

机构地区：[1]上海交通大学电子信息与电气工程学院,上海市闵行区200240

出　　处：《电网技术》2011年第1期122-126,共5页Power System Technology

基　　金：国家自然科学基金项目(50677038)~~

摘　　要：采用电声脉冲法(pulsed electro-acoustic method,PEA)研究了经过不同预处理温度处理后的高压直流电缆附件绝缘材料——硅橡胶(silicone rubber,SIR)及三元乙丙橡胶(ethylene propylene diene monomer,EPDM)绝缘层的空间电荷分布。为分析导致此空间电荷积累不同的原因,采用拉伸性能测试和动态热机械分析(dynamic thermal mechanical analysis,DMA)研究了高压直流电缆附件绝缘材料化学分子结构的变化。实验结果表明,SIR材料经过150℃预处理后,硫化更充分、交联密度增加,从而使得绝缘层中的空间电荷量减少,因此SIR的预处理以150℃为宜;EDPM材料经过150℃预处理后,综合表现为解聚反应,从而使得绝缘层中的空间电荷量增加,因此EDPM预处理温度以80℃为宜。Using pulsed electro-acoustic method （PEA）, the space charge distribution in the insulating layer made of silicone rubber （SIR） and ethylene propylene diene monomer （EPDM）, which are pretreated at different temperatures and used to the cable accessories for HVDC transmission projects, is researched. To analyze the reason leading to different accumulation of space charge, the change of chemical molecular structure of insulating material for cable accessories used in HVDC transmission is researched via tensile property tests and dynamic thermal mechanical analysis （DMA）. Results of verification experiments show that after pretreating SIR at the temperature of 150℃, the vulcanization SIR is more adequate and the crosslinking density increases, which makes the space charge in insulating layer decreased. Therefore it is suitable to perform pretreatment of SIR at the temperature of 150℃. After pretreating EPDM at the temperature of 150℃, the depolymerization reaction of EPDM is presented and it makes the space charge in insulating layer increased. Therefore it is suitable for EDPM to be pretreated at lower temperature, e.g., 80℃.

关 键 词：预处理温度 高压直流电缆 硅橡胶 三元乙丙橡胶 空间电荷 拉伸性能 动态热机械分析 

分 类 号：TM85[电气工程—高电压与绝缘技术]