变电站电磁骚扰耦合路径分析

Coupling Path Analysis of Electromagnetic Disturbances in a Substation

为研究变电站中电磁骚扰的传播,列举了变电站中常见的电磁骚扰源,通过引入电磁拓扑的概念,给出变电站中电磁骚扰源与二次回路的耦合对应关系,建立了变电站中电磁骚扰耦合的树状图。讨论树状图中分析模型的选择及电磁干扰的抑制的结果表明,应根据骚扰信号的频率确定模型类型(如集总参数、分布参数、传输线、天线模型等),采取屏蔽、接地等抑制措施时应处理好骚扰信号的返回路径。电磁拓扑法为分析多种骚扰与敏感电路的耦合关系,进而探讨干扰抑制提供了研究途径。

In order to study transmission of electromagnetic disturbances in a substation, usual electromagnetic disturbance sources are presented. The concept of electromagnetic topology is brought into substation electromagnetic interference analysis and the coupling relationship between electromagnetic disturbance sources and secondary circuit is then given. The tree figure of electromagnetic disturbance coupling in a substation is established. Selection of analysis models in the tree figure and suppression of electromagnetic interferences are further discussed. Model type, such as lumped model, distributed model, transmission line model and antenna model, should be determined by frequencies of electromagnetic disturbance signals. Return paths of electromagnetic disturbance signals need to be handled carefully when measures of shielding and grounding etc. are taken.