电压稳定剂对电缆附件三元乙丙橡胶本体与绝缘界面耐电性能影响  

Effects of Voltage Stabilizers on the Body and Interface Electrical Strengths of EPDM for Cable Accessory

作　　者：李春阳[1] 陈先胜 胡巍 孙煜煊 韩志东 赵洪[1] LI Chunyang;CHEN Xiansheng;HU Wei;SUN Yuxuan;HAN Zhidong;ZHAO Hong(Key Lab of Engineering Dielectrics and Their Application,Ministry of Education(Harbin University of Science and Technology),Harbin 150080,Heilongjiang Province,China;Nanchang Power Supply Company,State Grid Jiangxi Electric Power Co.,Ltd.,Nanchang 330069,Jiangxi Province,China)

机构地区：[1]工程电介质及其应用技术教育部重点实验室(哈尔滨理工大学),黑龙江省哈尔滨市150080 [2]国网江西省电力有限公司南昌供电分公司,江西省南昌市330069

出　　处：《中国电机工程学报》2023年第13期5281-5293,共13页Proceedings of the CSEE

基　　金：国家自然科学基金项目(52107015)。

摘　　要：三元乙丙橡胶(ethylene propylene diene monomer,EPDM)增强绝缘作为高压电缆附件中的关键部件,其电树枝化和绝缘界面沿面放电问题严重。为改善EPDM本体和绝缘界面的耐电性能,采用4种电压稳定剂对EPDM进行改性,系统地研究电压稳定剂对EPDM交流耐电树枝性能和交、直流击穿强度的影响,探究电压稳定剂的抗迁出性以及电压稳定剂对压力下EPDM直流击穿强度和沿面击穿电压的影响。结果表明,4种电压稳定剂均能提高EPDM的交流电树枝起始电压,并抑制电树枝生长;电压稳定剂对EPDM交流击穿强度改善的作用有限,但均能提高EPDM的直流击穿强度;该文所选电压稳定剂能参与交联反应并接枝在EPDM大分子上,因此具有良好的抗迁出性;随着外施压力的增大,EPDM直流击穿强度先增大、后减小,且高压力下电压稳定剂作用效果有所削弱。沿面击穿实验结果表明,4种电压稳定剂对于EPDM表面击穿电压有提高作用,且对EPDM-交联聚乙烯绝缘界面击穿电压的改善效果更加显著。The ethylene propylene diene monomer(EPDM)reinforced insulation is a key component of high-voltage cable accessories.The electrical treeing in the reinforced insulation and the surface discharge on the interface are serious.To improve the electrical strengths of EPDM body and its insulating interface,four voltage stabilizers are added into EPDM and their effects on the alternating current(AC)electrical tree resistance and AC and direct current(DC)breakdown strengths are systematically studied.The emigration resistance of voltage stabilizers and the influences of voltage stabilizers on the DC breakdown strength and surface breakdown voltage under pressure are investigated.The results indicate that the four voltage stabilizers all increase the electrical tree initiation voltage and inhibit electrical tree growth in EPDM.Voltage stabilizers have limited effects on improving AC breakdown strength,but all effectively improve the DC breakdown strength of EPDM.The voltage stabilizers are grafted to the macromolecules of EPDM during crosslinking reaction,thus having good resistance to emigration.With the increase of external pressure,the DC breakdown strength of EPDM firstly increases and then decreases,and the effects of voltage stabilizers is weakened under high pressure.The surface breakdown test results show that the four voltage stabilizers improve the surface breakdown voltage of EPDM,and for the EPDM-crosslinked polyethylene interface,the positive effect is more significant.

关 键 词：增强绝缘 三元乙丙橡胶 电树枝 电压稳定剂 绝缘界面 击穿强度 

分 类 号：TM85[电气工程—高电压与绝缘技术]