摘要
电场、温度场及空间电荷分布是高压直流(HVDC)交联聚乙烯(XLPE)电缆中间接头设计优化的重要参数。为此,利用COMSOL仿真软件计算了组合预制式、整体预制式2种电缆中间接头的电场分布、温度场分布、以及空间电荷分布,并分析了不同类型电缆中间接头各自的特点,提出了选型建议;针对2种类型的电缆中间接头,研究了材料参数、结构尺寸等因素对其性能的影响。结果表明:相较于整体预制式电缆中间接头,组合预制式电缆中间接头拥有更好的应用前景;通过对材料参数以及尺寸的研究发现,当使用硅橡胶(SR)作为电缆附件主要绝缘材料且硅橡胶电导率与电缆本体绝缘XLPE电导率的比值k约为10时,绝缘界面上的电场、温度场和空间电荷分布最优;优化应力锥曲线曲率半径、压接管厚度、内屏蔽层厚度等尺寸均能改善电场分布,且尺寸变化所达到的优化效果不如材料改性的优化效果显著,但却更具针对性。因此高压直流电缆中间接头的设计应以材料研制为主,以尺寸修正为辅。
Electric field, temperature field, and space charge distribution are important parameters for the optimal design of high voltage direct current （HVDC） cross-linked polyethylene （XLPE） cable intermediate joint. Consequently, we cal- culated the electric field, temperature field and space charge distribution of the composite prefabricated and integral prefabricated cable intermediate joint with the COMSOL simulation soitware, analyzed the structure properties of differ- ent cable intermediate joints, and put forward the type selection advice. Moreover, we investigated the material parameters and the size which affected the performance of the two types of cable intermediate joint. The results show that the integral prefabricated cable intermediate joint has better application foreground than the composite prefabricated cable intermediate joint. Through the research of material parameters and the size, it is found that the distribution of the electric field strength, the temperature, and the space charge on the insulation interface is relatively optimal when SR is the main insulation material in cable accessory and the conductivity ratio k between silicone rubber （SR） and XLPE is 10. Optimi- zation of stress cone curve radius of curvature, crimp thickness, inner shield thickness and other dimensions can improve the electric field distribution. However, the effect of size amendment is not as remarkable as that of material modification, but more targeted. As a result, design of high-voltage DC cable intermediate joint should be given priority to the devel- opment of the material and supplemented by size correction.
出处
《高电压技术》
EI
CAS
CSCD
北大核心
2017年第11期3591-3598,共8页
High Voltage Engineering
基金
国家电网公司科技项目(521340140098)
福建省自然科学基金(2015J01651)~~
关键词
有限元法
高压直流
整体预制式
组合预制式
电缆中间接头
电场
空间电荷
finite element method
high voltage direct current
integral prefabricated
composite prefabricated
cable in- termediate joint
electric field
space charge
