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首页> 外文期刊>Electric power systems research >Grounding systems under lightning surges with soil ionization for high voltage substations by using two layer capacitors (TLC) model
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Grounding systems under lightning surges with soil ionization for high voltage substations by using two layer capacitors (TLC) model

机译：使用两层电容器（TLC）模型的高压变电站的土壤电离雷电浪涌接地系统

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摘要

The grounding system behavior in the time domain for the high voltage substations is the key-parameter to ensure the system reliability during transient conditions. Many approaches are used to investigate the behavior of the grounding systems subjected to the lightning surges. These approaches aim to simplify the grounding systems by equivalent lumped circuit-parameters (RLC) or by using the electromagnetic field theory. The soil ionization phenomenon can effectively reduce the grounding electrode resistance because of changing the electrode equivalent radius located in the soils. Yet, most of these approaches have their relative assumptions with merits and demerits. The current work introduces a proposed model based on a developed grounding unit cell using the Two Layer Capacitors (TLC). The proposed cell is implemented as a unit cell to simulate the performance of the grounding system under lightning strikes with considering the soil ionization effects. Different developed models of the grounding-cells are used to simulate the behavior of the grounding system including the soil ionization process. Finite Difference Time Domain FDTD scheme is used to calculate the electromagnetic fields inside the different proposed unit cells during lightning surges. The application of the grounding unit cell is extended to be implemented for a typical high voltage substation of 500/220 kV. The grounding unit cells are presented as T neighboring sections to evaluate the overlapping between the different elementary electrodes and conductors of the complex grounding systems over the whole area of the substation. The circuit-model of the grounding unit cell is developed using EMTP-RV/MATLAB. Finally, the obtained results are compared with the similar results found in the literature with good consistency.
机译：高压变电站的时域接地系统行为是确保瞬态条件下系统可靠性的关键参数。许多方法用于调查遭受雷电冲击的接地系统的行为。这些方法旨在通过等效集总电路参数（RLC）或通过使用电磁场理论来简化接地系统。通过改变土壤中的电极当量半径，土壤电离现象可以有效降低接地电极的电阻。然而，这些方法中的大多数都有其相对假设，各有其优缺点。当前的工作介绍了一个建议的模型，该模型基于使用两层电容器（TLC）开发的接地单元电池。拟议中的单元被实现为一个单元，以模拟考虑土壤电离效应的雷击下的接地系统的性能。接地单元的不同开发模型用于模拟接地系统的行为，包括土壤电离过程。时域有限差分FDTD方案用于计算雷电浪涌期间不同建议的单位电池内部的电磁场。扩展了接地单元的应用范围，使其可用于典型的500/220 kV高压变电站。接地单元单元显示为T个相邻部分，以评估变电站整个区域中复杂接地系统的不同基本电极和导体之间的重叠。接地单元的电路模型是使用EMTP-RV / MATLAB开发的。最后，将获得的结果与文献中相似的结果进行比较，并具有良好的一致性。

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