正负极性雷电电流对避雷器的影响

Y. Trotsenko, Volodymyr Brzhezitskyy, O. Yandulskyy, Artem Nesterko, M. Dixit
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引用次数: 0

摘要

目的。利用真实雷电电流波形图并考虑雷电极性的避雷器模型的研究得到了进一步的发展。方法。电路仿真方法的电气方案模式,免费软件数字化的位图图形图像的雷电电流示波器,并将其转换成一个阵列的点。结果。研究了用于10kv电网的标称放电电流为10ka的典型避雷器的模型。采用IEEE工作组提出的一个著名的动态(频率相关)模型来模拟避雷器。对在专用塔上记录的真实雷电电流的正负极性示波图进行了数字化处理。利用自由电路仿真程序,确定了不同波形、不同极性的雷击电流流过避雷器时,避雷器端子处的剩余电压,以及相同振幅为10ka的雷击电流流过避雷器时避雷器应吸收的能量。人们已经发现,正雷击比负雷击潜在地更危险。结果表明,在正雷击电流结束前,避雷器所吸收的能量要比同幅的负雷击电流结束前多十倍以上。在改进架空电力线的防雷和保护变电站电气设备的高压绝缘免遭雷击过电压的任务中,所提出的方法得到了进一步的发展。创意。该方法考虑了雷电电流的正负极性脉冲之间的差异,这是用简化表达式近似雷电电流所不能达到的。实用价值。该方法考虑了雷电电流曲线的实际特征,提高了研究的准确性和可视化程度。参考文献20,图12。
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EFFECT OF LIGHTNING CURRENTS OF NEGATIVE AND POSITIVE POLARITY ON SURGE ARRESTER
Purpose. The study of surge arrester models using oscillograms of real lightning currents and taking into account the polarity of lightning has been further developed. Methodology. Methods of circuit simulation for electrical scheme modes, free software for digitizing a bitmap graphic image of a lightning current oscillogram and converting it into an array of points are used. Results. A studying the model of a typical surge arrester with a nominal discharge current of 10 kA, intended for use in a 10 kV network was carried out. A well-known dynamic (frequency-dependent) model proposed by the IEEE working group was used to simulate the surge arrester. Oscillograms of real lightning currents of negative and positive polarity which were recorded on special towers were digitized. Using a free circuit simulation program, the residual voltage at the terminals of the surge arrester was determined and the energy that the surge arrester should absorb in the event that lightning currents of different waveforms and polarities flow through it, but with the same amplitude of 10 kA. It has been found that positive lightning strikes are potentially more dangerous than negative lightning strikes. It was shown that before the ending of the positive lightning current, the surge arrester have to absorb more than ten times more energy than before the ending of the negative lightning current of the same amplitude. Further development of the proposed approach is seen in its use for the tasks of improving the lightning protection of overhead power lines and protecting the high-voltage insulation of electrical equipment of substations from lightning overvoltage. Originality. The approach takes into account the differences between impulses of lightning currents of negative and positive polarity, which cannot be achieved when using the approximation of lightning currents by simplified expressions. Practical value. The use of the proposed approach improves the accuracy and visualization of research, since it takes into account the actual features of the lightning current curve. References 20, figures 12.
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