柔性接触压力下接触网导线的温度场仿真

Simulation of temperature field of contact wire under flexible contact pressure conditions

为减小弓网系统温度分布对摩擦副电接触性能的影响,利用COMSOL Multiphysic软件建立了弓网系统温度场仿真模型,通过温升实验验证了模型的有效性.对柔性接触压力下接触网导线的热时间常数和稳态温升进行了仿真计算.随着滑动速度的增加,热时间常数逐渐减小,稳态温升呈现先减小后增加的变化趋势.随着接触电流的增加,热时间常数保持不变,稳态温升变化较小.相比于刚性接触压力,当滑动速度和接触电流恒定时,柔性接触压力下的热时间常数更小、稳态温升更低.

To reduce the influence of temperature distribution of pantograph-catenary system on the electrical contact characteristics, a temperature field simulation model was established with COMSOL Multiphysics software. The validity of the model was verified with lots of temperature experiments. And both thermal time constant and stable temperature rise of contact wire were simulated under flexible contact pressure conditions. The thermal time constant decreases gradually and the stable temperature rise firstly decreases then increases with the increase of sliding speed. The thermal time constant keeps constant and stable temperature rise changes slightly with the increase of contact current. When sliding speed and contact current keep constant, both the thermal time constant and stable temperature rise under flexible contact pressure conditions are smaller than that of under rigid contact pressure conditions.