动车组数字设备的弓网电弧电磁干扰分析

Analysis of electromagnetic interference on EMUs digital equipment caused by pantograph-catenary arc

弓网离线电弧是典型的电磁暂态现象,其引起的电磁发射,会对车载数字设备产生干扰,严重时可引发控制设备的误动作而危及运输安全。为探究有效的干扰抑制措施,提出了将轨道沿线测试与车内测试相结合,并将测试结果引入分析模型的电磁干扰分析方法。该方法首先通过沿线定点测试掌握噪声信号特性,然后通过车内实测获取干扰峰值场强,并结合异模干扰模型,计算得出受害设备端口的干扰电平。最后,根据测试结果和理论分析,给出了最严酷干扰时(150 MHz),干扰电平的幅值分布特性,一定程度上有助于干扰抑制措施的建立。

The pantograph-catenary＇ s disconnection can cause arc and arise electromagnetic emission,which will cause interference to EMUs digital equipment.The control may become disabled,thus the safety of transportation will be endangered.In search of effective measures for disturbance repressed,the method combined track and vehicle test together with analysis model is then proposed.That is noise characteristics are acquired at first through track test,the peak value of electric field intensity is measured as well by testing on the EMUs.Then,with differential mode,the amplitude of interference level is calculated.Finally,based on measurement and analysis,the interference amplitude level distribution on the most severe situation（150 MHz） is given,which can help,to some extent,the establishment of interference suppression measures.