基于流体多组分传输的气体绝缘母线温度场数值计算与分析

Thermal Field Calculation and Analysis of Gas Insulated Busbars Based on Fluid Multiple Species Transport

气体绝缘母线的工作状态与其散热性能以及温升直接相关。建立了有限元模型计算母线导体焦耳热损耗以及外壳涡流损耗,根据流体力学理论,采用流体多组分传输模型计算母线流场与温度场分布。利用单元映射方法实现涡流场、流场以及温度场的间接耦合,综合考虑母线与其内部绝缘气温度变化特性。针对分相封闭母线及共相封闭母线两种不同母线结构稳态与瞬态温度场进行数值计算,分析了母线与气体及外部空气边界的对流与辐射换热效应、流体物性参数随温度变化特性。针对分相封闭母线及共相封闭母线两种不同母线结构稳态与瞬态温度场进行数值计算,分析了母线与气体交界面对流与辐射换热量的比例关系、传热系数分布以及母线温升随电力负荷与时间的变化过程。通过对比计算结果与传统工程算法、单组分分析方法以及实验结果,验证了该模型的正确性。

The operation status of gas insulated busbars（GIBs） is relative to the heat dissipation ability and temperature rise property.Finite element method（FEM） was employed to calculate the joule losses in the conductors and eddy current loss in the tank.According to the fluid dynamic theories,the fluid multiple species transport model was used to investigate the fluid field and the thermal field distribution of the GIBs.Eddy current field results were indirectly coupled with fluid and thermal fields by the element mapping method.In addition to convection and radiation effects at the fluid-solid interfaces,the temperature dependent characteristics of fluid parameters were considered.Steady state and transient state thermal fields of isolated phase GIB and three phase in one tank type GIB were analyzed.Heat dissipation proportions by convection and radiation at the fluid-solid interfaces,heat transfer coefficient distribution and temperature change with load currents and time were investigated.The model is validated by comparison with the traditional engineering algorithm,the single species model and experimental results.