基于ANSYS电气设备接头的电热耦合场分析

Analysis of Electro-Thermal Coupling Field of Electrical Equipment Contact Based on ANSYS

因电气设备电接触不良而导致设备局部放热,是导致电网事故的主要原因之一。基于霍姆电接触理论,利用ANSYS软件建立更为直观的球面导体接触模型。该模型充分考虑了电气设备连接处实际接触散热情况,利用有限元法对接头进行电热耦合场分析。仿真结果表明了在同种材料和不同材料接触时,最高温度均发生在接触斑点处;但当不同材料接触时,上下接头的温度场分布不一样,接头最终温度受材料的电阻系数、导热系数等因素影响,电阻系数越大,导热系数越小,最终接头的温度越高,如果电流过大,一般这种材料先发生软化或熔化。

That the bad contact of electrical equipment leads to the equipment local heating is the main cause of power network accidents.Based on Holm's contact theory,the software ANSYS was used to build a more intuitive spherical conductor contact model.Thismodel sufficiently considered the actual contact heat dissipation of the electrical equipment junction and used the finite element method toanalyze the electro-thermal coupling.The simulation result shows that the highest temperature occurs at the contact spot whether the contactsurfaces have the same materials or not.However,when the different materials contact,the upper and lower joints of the temperaturefield distribution are different,and the final temperature of the contact will be affected by resistance coefficient and heat conductivity coefficientetc.The bigger the resistance coefficient,the smaller the heat conductivity coefficient and the higher the final contact temperature.If overcurrent occurs,the material will soften or melt firstly.