高电压技术2024，Vol.50Issue(11)：5058-5066,中插14,10.DOI:10.13336/j.1003-6520.hve.20231094
考虑扭绞的三芯海底电缆温度稳态分布数值求解方法
Numerical Solution Method for Temperature Steady-state Distribution in Three-core Subma-rine Cables with Twisted Structure
摘要
Abstract
The three-core submarine cable is an important device connecting offshore wind farms with land power grids,and its normal operation is of great significance to economic development.The relationship model between conductor temperature and fiber temperature is the theoretical basis of temperature distributed sensing,and the influence of twisting of optical fiber and cable on the relationship between conductor and optical fiber temperature is rarely taken into account in previous studies.Based on the finite element method,the electrothermal flow coupling model of three-core composite optical fiber submarine cable considering twisting is constructed,the relationship between conductor temperature and op-tical fiber temperature is obtained,and the effects of pitch,seawater temperature,seawater surface heat transfer coefficient and different cable sizes on the conductor and fiber temperatures under the buried and laying environment are analyzed.The simulation results show that,under the buried conditions,when the twisting is not considered,the conductor rises by 1.03℃,and the fiber rises by 1.00℃;moreover,when the twisting is considered,the conductor temperature and the fi-ber temperature are higher than those without considering the twisting;meanwhile,with the increase of the pitch,the twisting angle becomes smaller,and the temperature decreases;under the same conductor temperature,the larger the pitch is,the lower the fiber temperature will be.The flow of seawater during laying has a significantly stronger heat dissipation effect on the cable than that when buried.The larger the convective heat transfer coefficient is,the lower the temperature of the conductor and optical fiber will be.Under the same conductor temperature,a larger conductor cross-sectional area leads to higher fiber optic temperatures.关键词
复合光纤海缆/扭绞/电热耦合/热传导/热对流Key words
composite optical fiber submarine cable/twisting/electrothermal coupling/heat conduction/thermal con-vection引用本文复制引用
黎云博,王航,廖雁群,南保峰,肖集雄,杨帅..考虑扭绞的三芯海底电缆温度稳态分布数值求解方法[J].高电压技术,2024,50(11):5058-5066,中插14,10.基金项目
南方电网公司科技项目(030400KK52220021(GDKJXM20220747)).Project supported by Science and Technology Project of China Southern Power Grid(030400KK52220021(GDKJXM20220747)). （030400KK52220021(GDKJXM20220747）
