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首页> 外文期刊>Electronics >Characteristic Impedance Analysis of Medium-Voltage Underground Cables with Grounded Shields and Armors for Power Line Communication
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Characteristic Impedance Analysis of Medium-Voltage Underground Cables with Grounded Shields and Armors for Power Line Communication

机译：电力线通信用带屏蔽层和铠装的中压地下电缆的特性阻抗分析

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The characteristic impedance of a power line is an important parameter in power line communication (PLC) technologies. This parameter is helpful for understanding power line impedance characteristics and achieving impedance matching. In this study, we focused on the characteristic impedance matrices (CIMs) of the medium-voltage (MV) cables. The calculation and characteristics of the CIMs were investigated with special consideration of the grounded shields and armors, which are often neglected in current research. The calculation results were validated through the experimental measurements. The results show that the MV underground cables with multiple grounding points have forward and backward CIMs, which are generally not equal unless the whole cable structure is longitudinally symmetrical. Then, the resonance phenomenon in the CIMs was analyzed. We found that the grounding of the shields and armors not only affected their own characteristic impedances but also those of the cores, and the resonance present in the CIMs should be of concern in the impedance matching of the PLC systems. Finally, the effects of the grounding resistances, cable lengths, grounding point numbers, and cable branch numbers on the CIMs of the MV underground cables were discussed through control experiments.
机译：电力线的特性阻抗是电力线通信（PLC）技术中的重要参数。此参数有助于理解电源线阻抗特性并实现阻抗匹配。在这项研究中，我们集中于中压（MV）电缆的特征阻抗矩阵（CIM）。对CIM的计算和特性进行了研究，并特别考虑了接地屏蔽和铠装，这些在当前的研究中经常被忽略。通过实验测量验证了计算结果。结果表明，具有多个接地点的中压地下电缆具有前后CIM，除非整个电缆结构是纵向对称的，否则它们通常不相等。然后，分析了CIM中的共振现象。我们发现，屏蔽和铠装的接地不仅会影响其自身的特征阻抗，而且还会影响铁芯的特征阻抗，并且CIM中存在的谐振应该与PLC系统的阻抗匹配相关。最后，通过控制实验，探讨了接地电阻，电缆长度，接地点数和电缆分支数对中压地下电缆CIM的影响。

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