【作者】 张博；

【导师】 杨仕友；

【作者基本信息】 浙江大学 ， 电工理论与新技术， 2017， 硕士

【摘要】 高压电缆运行时将在地下钢筋混凝土排管中产生铜耗和铁耗。而这些损耗,包括电缆本身的损耗,不仅浪费了电能,同时还将影响电缆和排管的温度场分布。为解决传输线电流在传统钢筋混凝土地下电缆排管中产生涡流损耗而造成的电能浪费问题,论文将有限元数值分析技术应用于地下复杂环境涡流—温度场的分析与计算。提出了地下电缆排管涡流—温度耦合场的三维有限元模型,兼顾求解速度和计算精度需求的剖分方法以及多物理耦合场的迭代求解方法。论文通过对几种典型钢筋混凝土结构地下电缆排管的涡流场与温度场的数值分析,得到了在不同工况下典型钢筋混凝土结构地下电缆排管中金属构件的涡流分布,整个场域的温度场分布和谐态工况下的电缆线芯温度。并据此提出了玻璃纤维筋(Glass Fiber Reinforced Polymer,GFRP)代替传统钢筋的解决方案,通过数值仿真计算了替换后电缆排管中温度场的分布,进而从技术角度论证方案的可行性。论文对比分析了以实际工程为依托的两种典型结构电缆排管的技术特点和经济性能。数值分析结果表明,基于玻璃纤维筋电缆排管的替代方案在降低涡流损耗的同时具有更好的经济效益。更多还原

【Abstract】 When a high voltage core cable operates,it will generate magnetic and Joule and magnetic losses in the steel reinforced concrete duct.These losses including that of the cable itself will influence the distribution of the temperature field.In order to solve the electric energy loss which is generated from the eddy current in traditional underground steel reinforced duct structures,a finite element model and method was proposed to analyze the eddy current field and temperature field in the complex underground environment and a scheme of using the Glass Fiber Reinforced Polymer(GFRP)instead of the steel in the underground duct was proposed.Moreover,the three-dimensional eddy current-temperature coupled field was computed by adopting a fast convergence,high accuracy mesh technique and an iteration solver for the coupled multi-physics field.The eddy current distribution of the metal component,the temperature field distribution of the whole model were obtained;also the temperature of the cable cores under a harmonic current condition was analyzed.By comparing the technical and economic performances of the traditional and proposed models,it was concluded that the scheme of using GFRP instead of steel can reduce the loss,and possess better economic performance at the same time.更多还原