±525 kV直流海底电缆绝缘厚度设计与校核  

Insulation thickness design and verification of±525 kV DC submarine cable

作　　者：康鑫 赵远涛 夏峰 阮武 马修水 侯帅 KANG Xin;ZHAO Yuantao;XIA Feng;RUAN Wu;MA Xiushui;HOU Shuai(School of Information Science and Engineering,Zhejiang Sci-Tech University,Hangzhou 310018,China;Ningbo Oriental Cable Co.,Ltd.,Ningbo 315801,China;School of Information Science and Engineering,Ningbo Tech University,Ningbo 315042,China;Southern Power Grid Scientific Research Institute Co.,Ltd.,Guangzhou 510663,China)

机构地区：[1]浙江理工大学信息科学与工程学院,浙江杭州310018 [2]宁波东方电缆股份有限公司,浙江宁波315801 [3]宁波理工学院信息科学与工程学院,浙江宁波315042 [4]南方电网科学研究院有限责任公司,广东广州510663

出　　处：《绝缘材料》2024年第8期100-107,共8页Insulating Materials

摘　　要：本文以±525 kV柔性直流输电工程中的直流海底电缆为研究对象,开展了直流耐压试验、冲击耐压试验、梯度耐压试验,分析了绝缘材料的击穿场强、老化寿命指数、Bahder系数等关键参数,设计并计算了不同耐压条件下±525 kV直流电缆的绝缘厚度。基于直流电缆的电场分布和温度分布,对绝缘设计厚度进行校核。结果表明:直流电缆中电场分布的畸变程度主要由绝缘层温差决定,绝缘层温差主要由电缆导体通过的电流大小决定。综合考虑研究结果以及电缆长期安全可靠性,建议±525 kV直流电缆绝缘厚度设计按28 mm选取。Taking the DC submarine cable in±525 kV DC transmission project as the research object,we conducted DC voltage withstand test,impact voltage withstand test,and gradient voltage withstand test.The breakdown strength,ageing life index,Bahder's coefficient and other key parameters of the insulation material were analyzed.The insulation thickness of the±525 kV DC cable under different voltage withstand condition was designed and calculated.The insulation design thickness was calibrated on the basis of the electric field distribution and temperature distribution of DC cable.The results show that the distortion degree of electric field distribution in DC cables is mainly determined by the temperature difference of insulation layer,and the insulation temperature difference is mainly determined by the magnitude of current passing through the cable conductor.Taking into account the research results and the long-term safety and reliability of cable,it is recommended that the insulation thickness of ±525 kV DC cables is designed to be 28 mm.

关 键 词：±525 kV直流海底电缆 绝缘厚度 电场分布 温度分布 

分 类 号：TM247[一般工业技术—材料科学与工程]