Space electromagnetic interference analysis of secondary equipment signal cable

In the field of high-voltage transmission and distribution, secondary equipments are influenced by electromagnetic coupling effect generated primary circuit, which causes strong interference to signal cable. this paper, an equivalent circuit model is established for cables in different forms, namely conventional cable, coaxial cable twisted pair based on line theory. Based model, responses these three kinds under impact spatial plane wave analysed frequency domain. Different impedance characteristics at near-end far-end, layouts, injection directions considered analysis. The response subjected obtained By comparing conditions, measures supress from obtained. It can be used guide selection cabling equipment power system.