66 kV交联聚乙烯海底电缆绝缘厚度设计  

Insulation Thickness Design of 66 kV XLPE Submarine Cable

作　　者：王泽瑞 赵学童[1] 赵远涛 单潜瑜 杨丽君[1] 廖瑞金[1] WANG Zerui;ZHAO Xuetong;ZHAO Yuantao;SHAN Qianyu;YANG Lijun;LIAO Ruijin(State Key Laboratory of Power Transmission Equipment and System Security and New Technology,Chongqing University,Chongqing 400044,China;Ningbo Orient Wires&Cables Co.,Ltd.,Ningbo 315800,China)

机构地区：[1]重庆大学输配电装备及系统安全与新技术国家重点实验室,重庆400044 [2]宁波东方电缆股份有限公司,宁波315800

出　　处：《高电压技术》2023年第6期2634-2643,共10页High Voltage Engineering

摘　　要：随着国内外海上风电工程的快速发展,66 kV交联聚乙烯(XLPE)海底电缆以其较低的生产、运维成本受到各方青睐。然而,国内尚无针对66 kV XLPE海缆设计的结构标准。为规范66 kV XLPE海缆的技术要求,有必要对其绝缘厚度进行合理设计。为此选取了66 kV海缆用XLPE试样进行了工频击穿试验和冲击击穿试验,发现XLPE的击穿场强与其厚度的关系符合反幂定律。然后,基于步进应力试验计算得到30℃和90℃下XLPE的寿命指数n分别为13.9和15.1,并进一步通过冲击和交流耐压试验的结果,综合得到66 kV海缆的推荐绝缘厚度为8.9 mm。基于该方法得到的66 kV海缆绝缘厚度与传统依靠经验设计的绝缘厚度相比更薄,为轻型66 kV海缆的绝缘厚度设计提供了理论参考和试验依据。With the fast development of domestic and international offshore wind power,66 kV submarine cable shows considerable advantages for its low costs in the processes of power transmission,operation and maintenance on offshore wind farm systems.At present,there are no standards for the structure design of 66 kV submarine cable.In order to specify the technical requirements of 66 kV submarine cables,it is necessary to design a reasonable XLPE insulation thickness for the 66 kV submarine cable.In this work,AC breakdown test and impulse breakdown test are carried out for the 66 kV submarine cable insulation.It is found that the variation of the breakdown strength of XLPE samples with the thickness follows the inverse power law.Then,the submarine cable life indexes(n=13.9 and n=15.1)are obtained based on the step-stress test at 30℃and 90℃,respectively.Furthermore,the impulse and AC withstand strength of the 66 kV insulation are tested,and the insulation thickness of 8.9 mm are recommended.The insulation thickness of 66 kV submarine cable designed in this work is thinner compared with the conventional design scheme.The research can provide the theoretical reference and experimental gist for the light 66 kV submarine cable.

关 键 词：XLPE 步进应力 温度系数 厚度指数 海底电缆 

分 类 号：TM247[一般工业技术—材料科学与工程]