电磁脉冲对线缆的耦合仿真研究
发布时间：2019-02-16 22:38
【摘要】：系统互连线缆的广泛存在,会产生电磁场到线缆的耦合问题。一旦线缆遭到电磁脉冲辐照,电磁能量通过线缆进入系统,会对敏感的电子器件造成毁伤。因此敏感的电子系统需要电磁加固才能保证即使受到脉冲干扰仍能正常工作。电磁加固设计必须要以耦合量及耦合规律作为依据。本文以电磁场理论、传输线方程为理论基础,细致地讨论了单线回路、多线回路及屏蔽线缆的建模与计算问题,给出了不同算例,为工程中电磁加固设计提供参考。本文研究电磁脉冲对线缆的耦合仿真,所取得的主要成果为:1.本文根据单线回路的传输线方程分别研究了线缆长度、高度、入射角及线径对耦合量的影响。对以往的结论进行修正后得到:其他条件不变时,线缆长度在0.1m~6m范围内,耦合量随线长增加而增加;线缆高度在0.25m~8m区间时,耦合电流随高度的增大而增大。同时,本文研究了高空核电磁脉冲E2、E3阶段对线缆的耦合量,得到结论:对高空核电磁脉冲E1阶段的防护设计就能将E2、E3阶段的防护考虑在内。2.本文提出了一种计算同轴线芯线耦合量的方法。此方法根据屏蔽层内外回路的特点,建立耦合方程。经过合理简化,将内回路的非齐次方程组转变成常系数方程组,并逐步推导,最终得到计算公式。依据具体同轴线参数对其计算,得到了1MHz时同轴线芯线上的耦合电流分布,并分别计算了芯线终端位置的时频域耦合电流曲线及屏蔽层屏蔽效能。通过CST软件仿真验证了方法的合理性。此方法为工程中计算同轴线芯线的耦合量提供了一种途径。3.本文通过对USB总线的分析,抽象出广义电路耦合模型。通过CST软件仿真,得到了此模型在无屏蔽层和有屏蔽层时的耦合量,并得到结论:在差分线和参考地线构成的多导体回路中,参考地线上的耦合电流高于差分线上电流,参考地线在防护设计时应该重点考虑;线缆屏蔽层可使芯线上的耦合电流显著降低,达到设备所能耐受或保护的量级。
[Abstract]:The widespread existence of system interconnection cable will lead to the coupling problem between electromagnetic field and cable. Once the cable is irradiated by electromagnetic pulse, the electromagnetic energy enters the system through the cable, which will damage the sensitive electronic device. Therefore, sensitive electronic systems require electromagnetic reinforcement to ensure that they work properly even when they are disturbed by pulses. Electromagnetic reinforcement design must be based on coupling quantity and coupling law. Based on the theory of electromagnetic field and transmission line equation, this paper discusses in detail the modeling and calculation of single loop, multi-wire loop and shielded cable, and gives different calculation examples, which provides a reference for the design of electromagnetic reinforcement in engineering. In this paper, the coupling simulation of electromagnetic pulse to cable is studied. The main results are as follows: 1. The effects of cable length, height, incident angle and diameter on the coupling are studied based on the transmission line equations of the single loop. After revising the previous conclusions, it is concluded that when other conditions are invariant, the cable length is in the range of 0.1m~6m, and the coupling amount increases with the increase of the wire length, and the coupling current increases with the increase of the height of the cable when the cable height is in the 0.25m~8m region. At the same time, the coupling capacity of E2E3 phase to cable is studied in this paper. It is concluded that the protection design of E2E3 stage can take the protection of E2E3 into account. 2. In this paper, a method for calculating coaxial core coupling is presented. According to the characteristics of the inner and outer circuits of the shielding layer, the coupling equation is established. After reasonable simplification, the inhomogeneous equations in the inner loop are transformed into the constant coefficient equations, and then the formulas are derived step by step. According to the specific coaxial parameters, the coupling current distribution on the coaxial core line of 1MHz is obtained, and the time-frequency coupling current curve of the core terminal position and shielding effectiveness of the shield layer are calculated respectively. The rationality of the method is verified by CST software simulation. This method provides a way to calculate the coupling quantity of coaxial core line in engineering. Based on the analysis of USB bus, the generalized circuit coupling model is abstracted in this paper. Through CST software simulation, the coupling amount of the model is obtained in the case of unshielded and shielded layers, and it is concluded that the coupling current on the reference ground wire is higher than that on the differential line in the multi-conductor loop composed of the difference wire and the reference ground wire, and the coupling current on the reference ground wire is higher than that on the differential line. The reference ground wire should be considered in the protection design. The cable shielding layer can significantly reduce the coupling current on the core wire, reaching the order of magnitude that the equipment can withstand or protect.
【学位授予单位】：西安电子科技大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TN811
本文编号：2424911
[Abstract]:The widespread existence of system interconnection cable will lead to the coupling problem between electromagnetic field and cable. Once the cable is irradiated by electromagnetic pulse, the electromagnetic energy enters the system through the cable, which will damage the sensitive electronic device. Therefore, sensitive electronic systems require electromagnetic reinforcement to ensure that they work properly even when they are disturbed by pulses. Electromagnetic reinforcement design must be based on coupling quantity and coupling law. Based on the theory of electromagnetic field and transmission line equation, this paper discusses in detail the modeling and calculation of single loop, multi-wire loop and shielded cable, and gives different calculation examples, which provides a reference for the design of electromagnetic reinforcement in engineering. In this paper, the coupling simulation of electromagnetic pulse to cable is studied. The main results are as follows: 1. The effects of cable length, height, incident angle and diameter on the coupling are studied based on the transmission line equations of the single loop. After revising the previous conclusions, it is concluded that when other conditions are invariant, the cable length is in the range of 0.1m~6m, and the coupling amount increases with the increase of the wire length, and the coupling current increases with the increase of the height of the cable when the cable height is in the 0.25m~8m region. At the same time, the coupling capacity of E2E3 phase to cable is studied in this paper. It is concluded that the protection design of E2E3 stage can take the protection of E2E3 into account. 2. In this paper, a method for calculating coaxial core coupling is presented. According to the characteristics of the inner and outer circuits of the shielding layer, the coupling equation is established. After reasonable simplification, the inhomogeneous equations in the inner loop are transformed into the constant coefficient equations, and then the formulas are derived step by step. According to the specific coaxial parameters, the coupling current distribution on the coaxial core line of 1MHz is obtained, and the time-frequency coupling current curve of the core terminal position and shielding effectiveness of the shield layer are calculated respectively. The rationality of the method is verified by CST software simulation. This method provides a way to calculate the coupling quantity of coaxial core line in engineering. Based on the analysis of USB bus, the generalized circuit coupling model is abstracted in this paper. Through CST software simulation, the coupling amount of the model is obtained in the case of unshielded and shielded layers, and it is concluded that the coupling current on the reference ground wire is higher than that on the differential line in the multi-conductor loop composed of the difference wire and the reference ground wire, and the coupling current on the reference ground wire is higher than that on the differential line. The reference ground wire should be considered in the protection design. The cable shielding layer can significantly reduce the coupling current on the core wire, reaching the order of magnitude that the equipment can withstand or protect.
【学位授予单位】：西安电子科技大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TN811
【参考文献】
相关期刊论文 前1条
1 王一哲;王泽忠;柳华;徐迪;李云伟;;瞬态电磁场对屏蔽电缆的耦合机理[J];高电压技术;2009年08期
，本文编号：2424911
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