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首页> 外文期刊>Electric power systems research >Full-wave black-box transmission line tower model for the assessment of lightning backflashover
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Full-wave black-box transmission line tower model for the assessment of lightning backflashover

机译：全波黑匣子传输线塔模型，用于评估闪电反向射击

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摘要

In order to calculate the overvoltages across the insulator strings of overhead lines, electromagnetic transient (EMT)-type simulators require a model of the tower and its grounding system. In this paper, an electromagnetic field simulation model based on the solution of the full-wave frequency-domain Maxwell's equations is established to obtain an EMT-compatible black-box representation of the transmission line tower for time-domain simulations. Details of the system, such as the grounding system consisting of counterpoise electrodes, shield wires, phase conductors, and tower cross arms and slant elements are considered in the simulation model. The frequency dependence of soil electrical parameters is included as well. The input data to the frequency-domain simulation model consists of the topology of the tower structure, grounding system, and the parameters of the surrounding medium. As a case study, the developed simulation model is applied to obtain the black-box representation (macromodel) of a 400kV double circuit tower, where the lightning current injected at the tower top is the input, and the output is the induced voltage across the insulator strings. The critical current leading to the flashover of the insulator strings is calculated according to various existing flashover models and two different first stroke lightning current waveforms. Finally, a probabilistic analysis is performed to obtain the percentage of downward negative first strokes leading to a backflashover.
机译：为了计算跨越线的绝缘体串的过电压，电磁瞬态（EMT）型模拟器需要塔架及其接地系统的模型。在本文中，建立了基于全波频域麦克斯韦方程式的解决方案的电磁场仿真模型，以获得用于时域模拟的传输线塔的EMT兼容的黑盒表示。在模拟模型中考虑了系统的细节，例如由对电极，屏蔽线，相导体和塔交叉臂和倾斜元件组成的接地系统。还包括土壤电气参数的频率依赖性。频域仿真模型的输入数据包括塔架结构，接地系统和周围介质参数的拓扑组成。作为案例研究，应用了开发的仿真模型以获得400kV双电路塔的黑盒表示（Macromodel），其中注入在塔顶的雷电是输入，输出是辐射电压绝缘体字符串。导致绝缘体串的闪光灯的临界电流根据各种现有的闪络模型和两个不同的第一笔划闪电电流波形来计算。最后，进行概率分析以获得导致反向射流的向下负第一笔划的百分比。

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