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Lightning performance of transmission lines based upon real return-stroke current waveforms and statistical variation of characteristic parameters

机译：基于实际回程电流波形和特征参数的统计变化的输电线路闪电性能

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摘要

This paper presents investigative studies concerning the lightning performance of 500 kV transmission lines considering the characteristic parameters of first stroke current observed in measurement data along with its statistical variation. Therefore, advanced electromagnetic models were applied during the development of computational models, thus allowing a realistic representation of the first stroke current waveform. Lightning performance studies were conducted applying two of the most commonly used return-stroke current models, besides the first stroke current model recommended by CIGRE. The aim therefore is to identify which of these present the most accurate results, when compared to the use of real return-stroke current waveforms. The volt-time characteristics produced by each of the return stroke current waveforms were evaluated using both the leader progression model (LPM) and volt-time curve. The breakdown process modelled through LPM is able to represent accurately the physical process established along the perimeter of the insulator strings, during a backflashover event. Analysis of leader length and velocity can reveal the influence of particular characteristics of lightning overvoltage waveform across the insulators produced by different return-stroke current waveforms in the assessment of the lightning performance of a transmission line. The computational modelling developed herein, allows identifying the critical current, the amplitude of the overvoltage that produces the backflashover, and the instant of time that breakdown occurs. The proposed modelling also makes it possible to determine in which insulator string and tower the backflash happens. (C) 2016 Elsevier B.V. All rights reserved.
机译：本文针对500 kV输电线路的雷电性能进行了研究，其中考虑了在测量数据中观察到的第一冲程电流的特征参数及其统计变化。因此，在计算模型的开发过程中应用了先进的电磁模型，从而可以真实表示第一冲程电流波形。除CIGRE推荐的第一个冲程电流模型外，还使用两个最常用的返回冲程电流模型进行了闪电性能研究。因此，与使用实际的返回冲程电流波形进行比较时，目的是确定其中哪一个呈现最准确的结果。使用领导者级进模型（LPM）和伏特时间曲线评估了每个回程电流波形产生的伏特时间特性。通过LPM建模的击穿过程能够准确表示在回闪事件期间沿着绝缘子串周长建立的物理过程。引线长度和速度的分析可以揭示在评估传输线雷电性能时，不同回程电流波形所产生的绝缘子上雷电过电压波形的特定特性的影响。本文开发的计算模型可以识别临界电流，产生反闪的过电压幅度以及发生击穿的时间。所提出的模型还使得可以确定在哪个绝缘子串和塔中发生反闪。 （C）2016 Elsevier B.V.保留所有权利。

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