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Statistical analysis on measured lightning overvoltage surges in a 110 kV air-insulated substation

机译：110 kV空气绝缘变电站雷电过电压实测值的统计分析

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The wide variety of lightning stroke characteristics and the modifying effects of power system components result in a diversity of intrusive lightning voltage waveshapes that stress transformers. These are not the traditional standard lightning impulses with a waveshape of 1.2/50 μs. Therefore the applicability of the standard lightning impulse voltage to power transformer testing has been questioned, and the overvoltage used in the test on transformers should be in accordance with the lightning overvoltage measured in the field. In this study, a lightning overvoltage monitoring system was installed in a 110 kV air-insulated substation, and the lightning overvoltages from 2007 to 2012 have been measured. Analysis was conducted on the measured data, which indicated that bidirectional oscillatory lightning waveforms rose up in the measured overvoltages. Using the energy method, the bidirectional oscillatory lightning waveform was reformulated into double exponential waveform, and the characteristic parameters, such as peak amplitude, front time and tail time, of the measured data were statistically analysed.
机译：雷击特性的多种多样以及电力系统组件的修改效果导致对变压器施加压力的侵入性雷电波形的多样性。这些不是波形为1.2 / 50μs的传统标准雷电脉冲。因此，人们质疑标准雷电冲击电压在电力变压器测试中的适用性，在变压器测试中使用的过电压应与现场测得的雷电过电压相符。在这项研究中，在110 kV空气绝缘变电站中安装了雷电过电压监控系统，并测量了2007年至2012年的雷电过电压。对测得的数据进行了分析，表明双向振荡雷电波形在测得的过电压中上升。使用能量法，将双向振荡雷电波形重构为双指数波形，并统计分析了所测数据的特征参数，如峰幅度，前时间和后时间。

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