Research On EMP Coupling Of Cable Bundle Terminated With Non-linear Loads

EMP coupling theory has always been one of the key issues in the field of electromagnetic compatibility,and the study of shielded cable EMP coupling is of great significance for evaluating the electromagnetic pulse protection capability of power system,communication system,space launch system,weapon position and other information infrastructure.The research is carried out around the nonlinear load EMP coupling of the cable bundles,and the main work is as follows:Aiming at the problem of low efficiency in long cable coupling calculation,the distributed source equivalent method is combined with the existing filter model.The solution process of EMP coupling of coaxial cable and shielded multi-core cable is deduced in detail.First,the transmission equation of the cable is established,the method of decoupling the core line is analyzed.Second,this paper introduces the treatment method of different transfer impedance and transfer guidance model in the decoupling case.Finally,the multi-conductor lumped excitation source equivalent method is given.The simulation experiment results show that the calculation results of the distributed source equivalent method are accurate and the calculation efficiency is high.In order to further improve the efficiency of cable EMP coupling calculation,the equivalent cable bundle method is summarized based on the lumped circuit method and the Distributed source equivalent method.Distribution source equivalent method and lumped circuit method are proposed for verification and analysis.Result shows that this method can not only be applied to frequency domain analysis,but also directly applied to time domain calculation,which not only simplifies the analysis step,but also improves the calculation efficiency.To realize the efficient analysis of the long cable bundle terminated with non-linear loads,combining equivalent cable bundle method with SPICE model method,we put forward a more reduced SPICE model.The ability of the model to handle nonlinear load is analyzed and verified through numerical experiments,and experiments show that the model has good analytical efficiency and convergence,and the transportability is good,which can be transplanted to other types of nonlinear load modeling for development and utilization.