三芯海底电缆中复合光纤与导体温度关系建模  

Modeling of Temperature Relation between Optical Fiber and Conductor in 3-Core Submarine Power Cable

作　　者：吕安强[1] 寇欣[1] 尹成群[1] 李永倩[1] Lv Anqiang;Kou Xin;Yin Chengqun;Li Yongqian(Department of Electronic and Communication Engineering North China Electric Power University Baoding 071003 China)

机构地区：[1]华北电力大学电子与通信工程系,保定071003

出　　处：《电工技术学报》2016年第18期59-65,共7页Transactions of China Electrotechnical Society

基　　金：国家自然科学基金(51407074;61377088);河北省自然科学基金(E2015502053);中央高校基本科研业务费专项基金(2015ZD21)资助项目

摘　　要：三芯光纤复合海底电缆中光纤以内填充层热阻的准确计算是建立光纤与导体温度关系的关键和难点。本文在建立三芯海缆热路模型的基础上,根据虚拟热源和镜像法,利用光纤温度计算出填充层外径处温度,进而计算出铠装层外径处温度;根据傅氏传热学原理计算出光纤处等温面至铠装层外径处等温面的热阻;利用形状因子法计算出填充层内径至铠装层外径的总热阻,再减去光纤处等温面至铠装层外径处等温面的热阻,得到光纤以内填充层的热阻;根据热路模型建立了光纤与导体的温度关系方程,并用有限元求解结果验证了方程的正确性。结果表明,三芯海缆的光纤与导体温度呈线性关系,导体温度每上升1.15℃,光纤温度上升1℃;相同导体温度下,环境温度每上升7.7℃,光纤温度上升1℃。根据光纤温度和环境温度可计算出导体温度,作为三芯海缆导体温度监测和载流量计算的理论依据。It is difficult to calculate the thermal resistant of filling layer within optical fiber in3-core optical composite submarine power cable. The temperature relationship between optical fiberand conductor can not be established until the above problem is resolved. In this paper, the temperatureat external diameter of filling layer was calculated using virtual thermal source and image method,based on the established thermal circuit of 3-core submarine power cable. Then the temperature atexternal diameter of armor layer was calculated. The thermal resistant between optical fiber andexternal diameter of armor layer was calculated according to Fourier heat transfer theory. Thesummation of thermal resistant between inner diameter of filling layer and external diameter of armorlayer was acquired by shape factor method. Finally, the thermal resistant of filling layer within opticalfiber was obtained, as the difference between the above summation and the thermal resistant. Thetemperature relationship equation between optical fiber and conductor was accordingly establishedbased on thermal circuit. It is indicated the relationship between the temperatures of optical fiber andconductor in 3-core submarine power cable is linear. The temperature of optical fiber will rise 1℃ ifthe temperature of conductor rises 1.15℃. The temperature of optical fiber will rise 1℃ if the ambient temperature rises 7.7℃ with constant temperature of conductor. The temperature of conductor can becalculated according to temperatures of optical fiber and environment, which can be regarded as thetheoretical basis for monitoring the temperature of conductor and calculating current-carrying capacityfor 3-core submarine power cables.

关 键 词：三芯海底电缆 热路 填充层热阻 光纤温度 导体温度 环境温度 

分 类 号：TM247[一般工业技术—材料科学与工程] TN818[电气工程—电工理论与新技术]