气体绝缘输电线路温升特性有限元分析

摘要

由于气体绝缘输电线路（ Gas⁃Insulated transmission Lines， GIL）的载流能力与温度相关，本文提出了一种基于有限元分析的GIL温升计算方法。为了研究GIL的负荷电流、气体压强、绝缘气体类型以及导体直径四种参数对GIL温升的影响，建立了二维电磁场分析模型，根据流体力学理论，建立了温度场分析数学模型，并给出了模型求解域及边界条件。利用有限元法迭代求解数学模型，获得了在不同参数下的GIL稳态温度场分布，并探讨不同参数对GIL温度变化的成因、变化趋势以及影响，为GIL的参数优化提供了参考。对比实验数据与模型的仿真结果，验证了模型的有效性。%As the current carrying capacity of gas⁃insulated transmission lines is related with temperature, a calcu⁃lation method of temperature rise based on finite element analysis is proposed. In order to study the effect on the temperature distribution of GIL by various parameters which are load current, gas pressure, gas type and diameter of the conductor, this article establishes a two⁃dimensional electromagnetic field analysis model. According to the fluid dynamics theory, mathematical model of temperature field analysis is given, as well as the solution domain and the boundary conditions of this model. Using the finite element method solving the given model, temperature distri⁃bution of GIL can be obtained about different parameters. Under the various circumstances of the load current, gas pressure, gas type and diameter of the conductor, this paper also analyzes the causes and the impacts on tempera⁃ture rise of GIL. The result provides a reference design for parameter optimization. Comparing experimental data and simulation results verifies the validity of the model.