高电压技术2017，Vol.43Issue(11)：3504-3513,10.DOI:10.13336/j.1003-6520.hve.20171031003
双层绝缘结构高压直流电缆电场分布仿真
Simulation on Electric Field Distribution in HVDC Cable with Double-layered Insulation
摘要
Abstract
According to the design idea of oil-paper high-voltage alternating current (HVAC) cable with graded insulation,high-voltage direct-current (HVDC) cable with double-layered insulation is manufactured by different nonlinear dielectric materials,and this is a possible solution to improve the electric field distribution and reduce the thickness of insulation.In order to verify the feasibility of double-layered insulation design concept of HVDC cable in theory,we analyze the effects of layered radius on the steady and ransient electric field distribution in HVDC cable with double-layered insulation by using the software of COMSOL Multiphysics under different temperature gradients and voltage types.By the simulation analyses,we define a synthetical insulation utilization coefficient considering multiple factors of the steady and transient electric field and temperature gradient.The design principle for double-layered insulation is that the dielectrics with lower conductivity and higher permittivity are used for inner layer insulation,and the layered radius is designed with the maximum of synthetical insulation utilization coefficient.Finally,the rationality of the double-layered insulation design principle is verified.The simulation results show that HVDC cable in the presence of double-layered insulation can significantly improve the electric field distribution under high temperature gradient,compared with single-layered insulation cable.The higher temperature gradients become,the more significantly the effect improves.Transient electric field distribution under insulation layers in the process of the lightning impulse is mainly affected by the interface charge and space charge formed in DC steady state,and the interface charge and space charge formed in steady state are closely related to temperature in HVDC cable with double-layered insulation,thus the temperature is also one of impact factors of transient electric field distribution under insulation layers in the process of the lightning impulse.关键词
HVDC电缆/双层绝缘结构/绝缘利用系数/暂态电场/温度梯度Key words
HVDC cable/double-layered insulation structure/insulation utilization coefficient/transient electric field/temperature gradient引用本文复制引用
李忠华,陈漳..双层绝缘结构高压直流电缆电场分布仿真[J].高电压技术,2017,43(11):3504-3513,10.基金项目
国家重点基础研究发展计划(973计划)(2014CB239504).Project supported by National Basic Research Program of China(973 Program)(2014CB239504). （973计划）
