弓网系统电磁作用力的研究

Study on Electromagnetic Force of Pantograph-catenary System

接触压力是弓网系统动态性能的核心指标，弓网之间保持相对恒定的接触压力是保证弓网持续稳定受流的关键。本文基于毕奥-萨法尔定律建立弓网系统电磁力理论计算模型，分析载流接触网导线周围的感应磁场作用、受电弓上感应磁场力的变化规律及其影响因素，主要包括接触网拉出值、由车轨振动造成的弓网垂向间距、牵引电流等因素的影响。计算结果表明：牵引供电电流对弓网系统电磁力的影响比较明显，故障时的电磁力最大值瞬间可高达弓网正常接触压力的30％～50％。

As the core index of the dynamic performance of pantograph-catenary system ,the contact force be-tween pantograph and catenary being kept relatively invariable is the key to ensure continuously steady dynamic current-collection. In this paper ,on the basis of the Biot-Savart theorem ,the theoretical calculation model of the magnetic field of pantograph-catenary system was established. The induced magnetic field around the cur-rent-carrying contact wires was calculated. The changing law of electromagnetic forces on pantographs and the influencing factors of catenary staggering values ,vertical spacing between pantograph and catenary caursed by vehicle-track vibration and traction currents were analyzed. The results show that traction currents have obvi-ous effects on the electromagnetic contact forces of the pantograph-catenary system and in case of any failure the peak instant electromagnetic force may reach as high as 30%～50% of the normal contact force.