高电压技术2017，Vol.43Issue(11)：3576-3582,7.DOI:10.13336/j.1003-6520.hve.20171031012
交流XLPE电缆改为直流运行时空间电荷积累特性仿真
Simulation on the Characteristics of Space Charge Accumulation When Converting the AC XLPE Cable to DC Operation
摘要
Abstract
Converting the existing cable lines from AC to DC operation,can make full use of the existing transmission corridor and maximize the transmission capacity of the original AC transmission lines.In order to investigate the characteristics of space charge accumulation and electric field distribution in the AC XLPE cable under DC voltage,the COMSOL Multi-physics software was used to simulate the thermodynamic temperature distribution at temperature difference of 45 ℃ and 25 ℃.The electric field distribution and the characteristics of space charge accumulation,based on the mathematical model of conductivity under DC voltage in the 66 kV AC XLPE power cable,were also simulated.The simulation results indicate that the temperature difference in the cable has a remarkable influence on the accumulation of space charge and the distribution of electric field.The reversal phenomenon will occur in the cable insulation and the maximum electric field will appear outside the insulation when stressing time is 8 hours and space charge density is 0.15 C/m3 at temperature difference of 45 ℃.The maximum electric field will be 6.71 MV/m,which is relatively safe for the actual operation of the AC cable.The simulation results have laid a foundation for converting the existing 66 kV AC cable lines from AC to DC operation.关键词
增容改造/空间电荷/电场强度/温差/COMSOL/交流XLPEKey words
uprating renovation/space charge/electric field intensity/temperature difference/COMSOL/AC XLPE引用本文复制引用
刘士利,李丛健,沈方,王春生,蔡国伟,宋卓然..交流XLPE电缆改为直流运行时空间电荷积累特性仿真[J].高电压技术,2017,43(11):3576-3582,7.基金项目
国家电网公司科技项目(5222JJ14002).Project supported by Science and Technology Project of SGCC (5222JJ14002). （5222JJ14002）
