同轴电缆感性脉冲电流注入试验仿真方法

Simulation methods for inductive pulsed current injection on the coaxial cable

为开展同轴电缆感性脉冲电流注入试验的量化分析及设计,利用Spice建模的方法求解电缆屏蔽层的耦合电流,给出了脉冲电流注入仿真中转移阻抗适用的测试方法以及屏蔽层与芯线间耦合的计算方程,建立了同轴电缆感性脉冲电流注入的Spice+Matlab联合仿真方法;另外,基于响应等效原理解决了负值电感的Spice电路表征问题,建立了转移阻抗实测值的拟合电路模型,继而在完成屏蔽层与芯线间耦合的集总近似电路建模的基础上,实现了同轴电缆感性脉冲电流注入的全Spice电路仿真。经数值和实验验证,上述两种方法一致性较好,且均具有较高的仿真精度和良好的时域收敛性,可以用于同轴电缆感性脉冲电流注入试验的设计、分析、效果预估等工作。

This paper aims at a quantitative analysis and the design of the inductive PCI(Pulsed Current Injection)on coaxial cables.First the induced current on the cable shield is derived by Spice circuit modeling.And the reasonable measurement method and coupling equations between the shield and inner conductor are proposed under the specific boundary conditions decided by the PCI.Then a Spice+Matlab simulation method for the inductive PCI on coaxial cables is developed.Furthermore,the negative inductor and the fitting circuit model of transfer impedance are expressed in Spice based on the principle of circuit equivalent response.Then the lumped approximate model of the coupling circuit between the shield and inner conductor is developed by subdividing the cable into several electrical small subsections.Finally a complete Spice model for the PCI on coaxial cables is constructed.By numerical and experimental validation,the two aforesaid methods have an appreciable agreement and show a high simulation precision and convergence in the time domain.Both of them will be very helpful to analysis and design of the PCI on coaxial cables.