海底交流电缆半导电屏蔽层/绝缘层性能对比研究  

Comparison and Study on Properties of Semi-conductive Shielding Layer and Insulation Layer for Submarine AC Cable

作　　者：李国倡 李雪静 刘明月 魏艳慧 雷清泉[1] 周自强 胡列翔 王少华 LI Guochang;LI Xuejing;LIU Mingyue;WEI Yanhui;LEI Qingquan;ZHOU Ziqiang;HU Liexiang;WANG Shaohua(Institute of Advanced Electrical Materials,Qingdao University of Science and Technology,Shandong Qingdao 266042,China;State Grid Zhejiang Electric Power Research Institute,Hangzhou 310014,China;State Grid Zhejiang Electric Power Co.,Ltd.,Hangzhou 310007,China)

机构地区：[1]青岛科技大学先进电工材料研究院,山东青岛266042 [2]国网浙江省电力有限公司电力科学研究院,杭州310014 [3]国网浙江省电力有限公司,杭州310007

出　　处：《高压电器》2022年第1期31-37,共7页High Voltage Apparatus

摘　　要：海底电缆输电在跨海域联网建设中发挥着重要作用。海缆电缆半导电屏蔽料的基本特性以及半导电层/绝缘层的电学、热学性能直接影响电缆的整体绝缘性能。文中从半导电料的基本理化性能出发,表征了海底电缆半导电屏蔽料的物理和化学性能,研究了半导电层/绝缘层的热学性能和击穿特性。导热系数分析表明,海缆半导电层由于含有大量CB颗粒,导热系数整体较高,约为绝缘层的两倍,随着温度升高,二者的导热系数均呈现缓慢增加趋势,半导电层导热系数由25℃的0.68 W/(m·K)增加到80℃的0.83 W/(m·K)。热膨胀特性分析表明:随着温度升高,海缆绝缘层的热膨胀系数比半导电层高出1.5倍左右,总体上两种材料受温度影响,形变不大,90℃时相对形变量分别为2.47%和1.28%。海缆击穿试验表明:随着温度的升高,海缆绝缘层的击穿场强逐渐降低,由25℃的125.2 kV/mm下降至90℃的92.5 kV/mm,相比绝缘层而言,海缆半导电层/绝缘层复合结构击穿场强下降幅度不大,说明二者具有较好的匹配性,尤其是在高温下保持了良好的击穿性能。该工作对于海底电缆绝缘性能提升和击穿故障分析具有重要的参考意义。Power transmission by submarine cable plays an important role in the construction of cross-sea network.The basic characteristics of the semi-conductive shielding material and the electrical as well as thermal properties of the semi-conductive layer/insulating layer directly affect the overall insulation performance of the cable.In the paper,the physical and chemical properties of semi-conductive shielding material for submarine cables are characterized from the basic physical and chemical properties of the semi-conductive material,and the thermal properties and breakdown characteristics of the semi-conductive layer/insulating layer are studied.The thermal conductivity coefficient analysis shows that the thermal conductivity coefficient of the semi-conductive layer of submarine cable,due to a large of CB particle,is high and is about twice that of the insulation layer.With the increase of temperature,the thermal conductivity coefficient for both of them shows gradual increase trend.The thermal conductivity coefficient of the semi-conductive layer increases from 0.68 W/(m·K)at 25℃to 0.83 W/(m·K)at 80℃.The thermal expansion characteristic analysis shows that with the increase of temperature,the thermal expansion coefficient of the insulation layer of the submarine cable is about 1.5 times higher than that of the semi-conductive layer.Generally,the deformation of above two kinds of materials is not significant due to influence of temperature and the relative deformation is 2.47%and 1.28%at 90℃respectively.The breakdown test of the submarine cable shows that with the increase of temperature,the breakdown field strength of insulation layer of submarine cable decreases gradually from 125.2 kV/mm at 25℃down to 92.5 kV/mm at 90℃.Compared to the insulation layer,the breakdown field strength drop of semi conductive layer/insulation composite structure is not evident,indicating that both of them have good compatibility and maintain excellent breakdown performance in high temperature in particular.This work has im

关 键 词：海底电缆 半导电屏蔽层 绝缘层 热学性能 击穿性能 

分 类 号：TM75[电气工程—电力系统及自动化] P756.1[天文地球—海洋科学]