温度对海底电缆半导电屏蔽层电学-热学性能的影响研究  

Effects of Temperature on Electrical and Thermal Properties of Semi-conductive Shielding Layer for Submarine Cable

作　　者：陈哲 沈海军 李国倡 王少华 李乃一 魏艳慧 雷清泉[3] CHEN Zhe;SHEN Haijun;LI Guochang;WANG Shaohua;LI Naiyi;WEI Yanhui;LEI Qingquan(State Grid Zhejiang Electric Power Co.,Ltd.,Hangzhou 310007,China;Construction Branch of State Grid Zhejiang Electric Power Co.,Ltd.,Hangzhou 310020,China;Institute of Advanced Electrical Materials,Qingdao University of Science and Technology,Qingdao 266042,China;State Grid Zhejiang Electric Power Research Institute,Hangzhou 310014,China)

机构地区：[1]国网浙江省电力有限公司,浙江杭州310007 [2]国网浙江省电力有限公司建设分公司,浙江杭州310020 [3]青岛科技大学先进电工材料研究院,山东青岛266042 [4]国网浙江省电力有限公司电力科学研究院,浙江杭州310014

出　　处：《绝缘材料》2020年第11期32-37,共6页Insulating Materials

摘　　要：海底电缆被广泛应用在跨海联网输电工程,环境温度会改变半导电屏蔽层的电学性能和热学性能,进而影响海缆整体绝缘性能。从海底电缆半导电层的基本性能出发,研究了温度对其电学-热学性能的影响。热学性能分析表明,随着温度的升高,试样的导热系数整体呈先上升再下降的趋势,在80℃附近达到峰值,最大值为0.83 W/(m·K),比室温下高出约1.5倍;当温度超过80℃时,由于EVA的作用,海缆半导电层的导热系数显著下降。热膨胀系数分析表明,随着温度的升高,试样的热膨胀系数先上升后下降,由25℃的1.36×10^-4/K增加至70℃的2.07×10^-4/K;当温度超过70℃时,热膨胀系数开始趋于缓慢下降,100℃时,热膨胀系数降低至1.88×10^-4/K。电学性能分析表明,随着温度的升高,试样的电阻率整体呈上升趋势,在80℃之前电阻率相对较低,当温度高于80℃时,半导电层表现出较明显的正温度系数效应。随着温度的升高,半导电层/绝缘层复合试样的交流电气强度呈现下降趋势,由25℃的104.5 kV/mm降低至90℃的90.8 kV/mm。总体上在温度作用下海缆半导电层和绝缘层具有较好的匹配特性。Submarine cable has been widely used in cross-sea interconnection transmission project.The environment temperature will change the electrical and thermal properties of semi-conductive shielding layer,and then affect the overall insulating properties of submarine cable.The influences of temperature on the electrical and thermal properties of semi-conductive layer in submarine cable was studied.The thermal property analysis results show that with the increase of temperature,the thermal conductivity of the sample increases at first and then decreases,and reaches peak value near 80℃.The maximum value is 0.83 W/(m·K),which is 1.5 times more than that of the sample at room temperature.When the temperature exceeds 80℃,the thermal conductivity decreases significantly due to the effect of EVA.The thermal expansion coefficient analysis shows that with the increase of temperature,the thermal expansion coefficient of the sample increases at first and then decreases,it increases from 1.36×10^-4/K at 25℃to 2.07×10^-4/K at 70℃.When the temperature exceeds 70℃,it begins to decrease slowly,and decreases to 1.88×10^-4/K at 100℃.The electrical property analysis results show that with the increase of temperature,the resistivity of the sample increases on the whole,and it is relatively low before 80℃.When the temperature exceeds 80℃,the semi-conductive composite shows significant positive temperature coefficient effect.With the increase of temperature,the AC breakdown strength of the semi-conductive layer/insulating layer composite structure decreases,and decreases from 104.5 kV/mm at 25℃to 90.8 kV/mm at 90℃.In general,the semi-conductive layer and insulation layer of submarine cable have good matching characteristics under the effect of temperature.

关 键 词：海底电缆 半导电屏蔽层 温度 电学性能 热学性能 

分 类 号：TM215[一般工业技术—材料科学与工程]