辅助设备共模阻抗特性对电磁钳注入试验的影响研究  

Study on Influence of Common Mode Impedance Characteristics of Auxiliary Equipment on Electromagnetic Clamp Injection Test

作　　者：范季陶 李萌 李天石 FAN Jitao;LI Meng;LI Tianshi

机构地区：[1]中国铁道科学研究院集团有限公司通信信号研究所,北京100081

出　　处：《铁道通信信号》2025年第4期45-49,共5页Railway Signalling & Communication

基　　金：中国铁道科学研究院集团有限公司通信信号研究所科研课题(2022HT05)。

摘　　要：在电磁兼容检测中,射频场感应的传导骚扰抗扰度试验经常会出现被测设备功能的非预期下降,故该测试项目被设备厂商和实验室检测人员广泛重视。而铁路通信信号产品端口类型复杂多样,常规端口类型的耦合/去耦网络无法满足该试验项目的干扰信号注入要求,为此需更多使用电磁钳耦合的注入方式。由于电磁钳通常只提供耦合功能,需利用辅助设备来满足共模阻抗要求和实现去耦功能,若辅助设备不满足共模阻抗要求时,还需要研究辅助设备侧对试验结果的影响。通过搭建2种试验电路,即高于标准阻抗值且对地开路和低于标准阻抗值且对地短路,模拟现实中不同共模阻抗的辅助设备,研究共模阻抗变化对试验结果的影响。总结出对应的测试规则:在使用电磁钳进行试验时,辅助设备侧应尽可能按照共模阻抗的要求进行配置,才能保证试验的复现性和准确性。In the process of electromagnetic compatibility testing,the conducted interference immunity test of RF field induction often causes an unexpected decline in the function of the tested equipment,so this test item is widely paid attention to by equipment manufacturers and laboratory testers,and the complex and diverse port types of railway communication and signal products,the coupling/decoupling network of conventional port types cannot meet the requirements of interference signal injection for this test item,so it is necessary to use electromagnetic clamp coupling injection method more frequently.Electromagnetic clamp usually only has coupling functions,and auxiliary devices are required to achieve common mode impedance and decoupling functions.When common mode impedance requirements are not met,it is necessary to study the influence of auxiliary equipment on the test results.Two kinds of test circuits with higher than the standard impedance and open to the ground,and lower than the standard impedance and short to the ground are built to simulate auxiliary devices with different common mode impedance in reality,and the influence of common mode impedance changes on the test results is studied.The corresponding test rules are summarized:when the electromagnetic clamp is used for testing,the auxiliary equipment side should be configured as far as possible according to the requirements of common mode impedance,so as to ensure the repeatability and accuracy of the test.

关 键 词：电磁兼容 传导骚扰抗扰度 电磁钳 共模阻抗 辅助设备 

分 类 号：U284.91[交通运输工程—交通信息工程及控制]