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 ...
