改进的海底电缆终端电压计算方法  

Improved calculation method of submarine cable terminal voltage

作　　者：黄烜城 朱正鼎 储海军 孙凯 赵凯强[1] 潘文霞[2] HUANG Xuancheng;ZHU Zhengding;CHU Haijun;SUN Kai;ZHAO Kaiqiang;PAN Wenxia(Jiangsu Frontier Electric Technology Co.,Ltd.,Nanjing 211102,China;College of Energy and Electrical Engineering,Hohai University,Nanjing 210098,China)

机构地区：[1]江苏方天电力技术有限公司,江苏南京211102 [2]河海大学能源与电气学院,江苏南京210098

出　　处：《电力科学与技术学报》2020年第5期159-164,共6页Journal of Electric Power Science And Technology

基　　金：高等学校学科创新引智计划(B14022);国家自然科学基金(51377047)。

摘　　要：海底长电缆终端电压是实施耐压试验的重要参数,为了确保耐压试验接线方案的安全性、有效性,电缆终端电压的精确计算尤为关键。以江苏某风电厂220 kV海底电缆为例,首先建立分布参数模型,推导单相电缆沿线电压的计算公式。考虑铠装层以及另外两相电缆的影响,结合三相电缆不同层之间的电容等效模型,提出一种基于末端并联等效电容法的改进型海缆计算模型,该模型能够准确计算海缆终端电压。利用PSCAD/EMTDC软件的精确模型仿真结果对所提海底电缆耐压试验终端电压计算公式进行验证,证明所提海底电缆耐压试验终端电压计算公式准确、方便,对保证耐压试验接线方案的安全性具有重要意义。Submarine cable terminal voltage is an important parameter for the implementation of voltage withstand test.In order to assure the safety and effectiveness of the wiring test of the voltage withstand test,the accurate calculation of the cable terminal voltage is particularly critical.A 220 kV submarine cable of a wind power plant in Jiangsu is considered.Firstly,the distribution parameter model is established and the formula for calculating the voltage along the single-phase cable is deduced.Then,the influence of armor layer and other two-phase cables is considered.Combined with the equivalent model of capacitance between different layers of three-phase cable,an improved calculation model of submarine cable based on the end parallel equivalent capacitor method is proposed to improve the calculation model so that the terminal voltage can be accurately calculated.Besides,the practical calculation equation of the terminal voltage is also verified by the accurate simulation results of PSCAD/EMTDC software,validating that the calculation equation of the terminal voltage for the submarine cable withstand voltage test deduced is accurate and convenient.It is of great significance to ensure the safety of the withstand voltage test connection scheme.

关 键 词：海底电缆 耐压试验 分布参数 等效电容 终端电压 

分 类 号：TM863[电气工程—高电压与绝缘技术]