高压海底电缆电-热耦合仿真分析和电压极性反转的影响研究  

Simulation Analysis on Thermoelectric Coupling Characteristics of HV Submarine Cables and Study of Effect of Voltage Polarity Reversal

作　　者：王威望 汪朝辉 卜文 李盛涛[1] WANG Weiwang;WANG Zhaohui;BU Wen;LI Shengtao(State Key Laboratory of Electrical Insulation and Power Equipment,Xi an Jiaotong University,Xi an,Shaanxi 710049,China)

机构地区：[1]电力设备电气绝缘国家重点实验室(西安交通大学)

出　　处：《广东电力》2019年第12期43-50,共8页Guangdong Electric Power

基　　金：国家重点研发计划项目(2018YFB0904803);电力设备电气绝缘国家重点实验室创新基金项目(EIPE18306);西安交通大学基本科研业务费资助项目(xjj2018231)

摘　　要：高电压、温度的耦合作用以及运行电压极性反转,均会严重影响海底电缆的运行稳定性。为此,针对高压直流海缆电热耦合模型进行仿真计算;基于海缆载流导体和主绝缘材料电导率和温度、电场的定量依赖关系,构建海缆电热耦合的仿真模型,分别仿真研究运行稳态和暂态时载流导体电流对海缆温度和电场分布特性的影响规律;设置不同的极性反转时间,研究电压极性反转对海缆温度和电场分布的影响。稳态分析结果表明:稳态时海缆的温度分布、绝缘层温差和电场分布随载流导体电流的增大而增大;绝缘层电场分布随着电流的增大逐渐变平缓,电流大于900 A时出现电场翻转现象。暂态分析结果表明:电场的稳定时间小于温度场;极性反转会造成绝缘层最大电场突变,引发过电压;随着极性反转时间的增加,过渡过程中的电压变化率增大。Coupling effects of high voltage and temperature and polarity reversal of operating voltage seriously affect operation stability of the submarine cables.Therefore,this paper makes simulating calculation for the thermoelectric coupling model of the HVDC submarine cable.Based on quantitative relationships between the conductivity of the current-carrying conductor and the main insulation material and the temperature and electric field,it builds the thermoelectric coupling model for studying influence rules of the currents of current-carrying conductor on temperature and electric field distribution in steady-state operation and transient operation.By setting different polarity reversal time,it studies effect of voltage polarity reversal on temperature and electric field distribution of the submarine cable.The steady-state analysis result indicates temperature distribution,temperature difference of the insulating layer and electric field all increase with the increase of the conductor current.The electric field distribution of the insulating layer gradually becomes gentle with the increase of the current.The electric field reverses when the current is greater than 900 A.Transient analysis shows that the stability time of electric field is less than that of temperature field.In addition,with the increase of polarity reversal time,the voltage change rate increases in the transition process.

关 键 词：高压海底电缆 电热耦合 电导率 暂态分析 极性反转 

分 类 号：TM855[电气工程—高电压与绝缘技术] TM15