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为得到快沿电磁脉冲对传输线的耦合规律,建立了无损和有损传输线的集总参数电路仿真模型,并利用其他方法和试验结果对其进行了验证。以一端接频变负载的无损三导体传输线为代表,建立了其无损集总参数电路模型,并利用状态变量法验证了模型的正确性。仿真发现:迭代线段长度越短,仿真结果越接近实际值,仿真时间越长;在迭代线段长度相同的情况下,传输线越长,仿真时间越长,2者基本成线性关系。以端接电阻、电容和瞬态抑制二极管的低损4芯电缆为代表,建立了其有损集总参数电路模型,并利用试验验证了模型的正确性。同时发现:负载上的响应与芯线排布、负载类型等有关。研究结果说明采用集总参数电路模型可以分析传输线对快沿电磁脉冲的串扰耦合问题,同时便于解决频变和非线性负载的响应,对多芯互联系统的电磁脉冲防护设计具有指导意义。
In order to get fast coupling rule of electromagnetic pulse to transmission line, a lumped parameter circuit simulation model of lossless and lossy transmission line was established and validated by other methods and test results. The non-destructive three-conductor transmission line with frequency-variable load at one end is used as a representative to establish its non-destructive lumped parameter circuit model. The state-variable method is used to verify the correctness of the model. The simulation results show that the shorter the length of the iteration line, the closer the simulation results are to the actual value and the longer the simulation time. In the case of the same length of the iteration line, the longer the transmission line and the longer the simulation time, the two are basically linear. The low-loss 4-core cable with termination resistor, capacitor and transient suppression diode is taken as representative, the circuit model of lossy lumped parameter is established, and the correctness of the model is verified by experiments. Also found that: the response on the load and the core arrangement, the type of load and so on. The results show that the lumped parameter circuit model can be used to analyze the crosstalk coupling of the transmission line to the fast electromagnetic pulse and to solve the response of the frequency-dependent and nonlinear loads. It is instructive for the design of electromagnetic pulse protection in multi-core interconnected systems.