摘要
高压直流电缆系统是实现远距离、大容量输电及海上新能源接入的关键电力设备之一。文中以500 kV直流电缆接头为研究对象,研究了附件用硅橡胶材料(SIR)的电导率特性对接头电场、电荷分布的影响,结果表明,增大硅橡胶材料的电导率常数和场强依赖系数,减少材料的活化能,能改善接头内部电场畸变,减少空间电荷的集聚。并以双组份加成型液体硅橡胶(LSR)和碳酸铜钙纳米纤维(CCTO)制备了接头增强绝缘材料,测试了其电导率特性,研究了不同电导率参数下的电场分布特点。最后,根据试验仿真结果,试制了500 kV直流电缆接头样机,通过了例行试验。文中的研究成果为500 kV乃至640 k V直流电缆附件材料的开发奠定了理论依据。
HVDC cable system is one of the key power equipment for long-distance and large-capacity transmission as well as offshore new energy access.The 500 kV DC cable joint is taken as the research object in this paper,the influence of the conductivity characteristics of the silicon rubber material(SIR)for accessory on the electric field and charge distribution of the joint is researched.The results show that increasing the conductivity constant and field strength dependence coefficient of the silicon rubber material and reducing the activation energy of the material can improve the electric field distortion inside the joint and reduce the accumulation of space charge.The joint reinforced insulation material is prepared by the addition of two component liquid silicone rubber(LSR)and copper and calcium carbonate nanofibers(CCTO).The conductivity characteristics of the joint reinforced insulation material are tested and the electric field distribution characteristics under different conductivity parameters are researched.Finally,according to the test simulation results,the 500 kV DC cable joint prototype is trial-made and passed the routine test.The research results in this paper lay a theoretical basis for the development of 500 kV and even 640 kV DC cable accessory material.
作者
王昱力
黄凯文
王格
赵鹏
WANG Yuli;HUANG Kaiwen;WANG Ge;ZHAO Peng(Wuhan Branch of China Electric Power Research Institute Co.,Ltd.,Wuhan 430074,China)
出处
《高压电器》
CAS
CSCD
北大核心
2023年第9期258-267,共10页
High Voltage Apparatus
关键词
直流电缆
电导率
硅橡胶
匹配性
DC cable
conductivity
silicone rubber
matching
