摘要
交直流绝缘层中本构方程的相似性决定了直流交联聚乙烯(XLPE)电缆附件与交流XLPE电缆附件的结构和设计原理的相似性。但是两种电场下本征参数性质的不同又使得直流XLPE电缆附件的设计不同于交流XLPE电缆附件的设计。为合理设计直流XLPE电缆接头,借鉴交流XLPE电缆接头设计的经验,给出了详细的设计直流XLPE电缆接头结构的方法。在直流XLPE电缆接头的设计中,界面空间电荷的抑制是接头设计成功的保证;而对界面空间电荷的抑制就需要界面两侧绝缘的介电常数和电导率的合理配合。最后,以30 kV直流XLPE电缆中间接头的设计为例,通过仿真计算得出,在高压屏蔽层端部附近界面上的允许切向电场强度取为1.5 kV/mm时,EPDM与XLPE在设计电场下符合应力锥优化设计要求的电导率比值范围可取为(0.5,5),在此范围之外的电导率比值的材料是不可以用来设计直流XLPE电缆中间接头的。
The similarity of constitutional equation in alternating current （AC） and direct current （DC） insulation suggests the similarity of structure and design principle for DC and AC cross linked polyethylene （XLPE） aceesso ties. However, the characteristics of intrinsic parameter in the two kinds of electric field are different, which makes the design of DC XLPE accessories be different from AC XLPE accessories. Drawing lessons from AC XLPE accessories, we propose a detailed design method for the structure of DC XLPE accessories. In designing DC XLPE joints, the suppression of interfaeial space charge is the most important, which depends on the reasonable permittivity and conductivity coordination of the two insulations. Finally, by taking the joint＇s design of 30 kV DC XLPE cable as an example, the conductivity ratio which meets the design requirements for optimization of stress cone is proposed from the result of simulation.
出处
《高电压技术》
EI
CAS
CSCD
北大核心
2009年第12期3159-3163,共5页
High Voltage Engineering
基金
国家自然科学基金(50677038)~~
关键词
中间接头
本构方程
界面空间电荷
电导率
参数配合
应力锥
joints
constitutional equation
interfaeial space charge
conductivity
parameter coordination
stress cone
