基于电磁-热耦合场的输电线路高频激励融冰分析与计算

Analysis and calculation of high-frequency excitation de-icing for transmission lines based on electromagnetic and thermal coupling field

覆冰事故是影响架空输电线路安全运行的重要因素。根据架空输电线路高频激励融冰的原理分析,建立了输电线路电磁-温度场二维有限元分析模型,确定耦合场的边界条件,求解得到输电线路内部磁场分布情况。将得到的焦耳热和介质热作为热源直接转化到热场模型中计算分析,并采用有限元ANSYS软件仿真求解出覆冰输电线路温度随施加激励时间的分布情况。此外,基于此模型通过仿真分析得出不同的外界因素对高频激励融冰时间的影响规律。该研究成果为高频激励融冰技术应用于输电线路融冰提供一定的参考价值。

Ice accident is the important factor affecting the safe operation of transmission lines.According to the principle of high-frequency excitation de-icing of overhead transmission lines,a 2D finite element model considering the coupling of electromagnetic field and thermal field of transmission lines is established.Based on the corresponding coupling field boundary conditions,magnetic field and temperature field distributions of transmission lines are obtained and the Joule’s heat and Medium’s heat,as heat sources,calculated in thermal field analysis is coupled with temperature field.The finite element ANSYS software method is applied to calculate the distribution of the temperature of ice-covered transmission lines with the applied excitation time.Moreover,the influence of different external factors on the time of ice-melting with high-frequency excitation is investigated based on this simulation model.The research results provide a certain reference value for the application of high-frequency excitation deicing technology in transmission lines.