抑制VFTO对智能组件传导干扰的EMI滤波器研究

Research on EMI Filter to Suppress VFTO Conducted Interference on Smart Components

GIS变电站内开关操作会产生高达数百兆赫兹的特快速暂态过电压(VFTO),通过对变电站智能组件的仿真,并采取在智能组件端口处加装EMI滤波器的办法来抑制VFTO的干扰。通过对EMI滤波器插入损耗、共模参数、差模参数的计算与仿真分析,得到符合要求的EMI滤波器电容、电感参数,并通过ATP-EMTP仿真模型验证该EMI滤波器能有效抑制进入智能组件的VFTO传导干扰。

The switching operation in the GIS substation will generate up to several megahertz very fast transient overvohage （VFTO）, Through the simulation of substation intelligent component, and take the method of installing the EMI filter at the ports of the smart component to suppress the interference of VFTO. Through the calculation and simulation analysis on insertion loss, common mode and differential mode parameters of EMI filter, capacitance and inductance parameters which can meet the requirement are obtained, and it is verified that the EMI filter can effectively restrain into intelligent component VFTO conducted interference by ATP - EMTP simulation model.