This article presents the induced overvoltage caused by nearby artificial-triggered lightning at different observation points on 10 kV distribution lines in the Conghua area of Guangzhou during the summer of 2018. The induced overvoltage waveforms measured at different observation points on the transmission lines feature obvious distribution regularity. Three-phase overvoltage has similar waveform characteristics, the induced overvoltage of each observation point starts from the slow rise of negative polarity, which can reach a negative peak after tens of microseconds, then polarity reversal occurs within 2–10 μ s, and bipolar periodic attenuation oscillation begins after reaching the positive peak, and finally falls to 0 level. According to the characteristics of the waveform, the induced overvoltage waveform can be divided into three parts: the negative peak rising process, the polarity conversion process, and the attenuation oscillation process. With the increase of the distance from the observation point to the lightning channel, the negative peak value increases gradually, and the increase slows down near the end of the line; the time of polarity conversion increases gradually, and the peak-to-peak value decreases gradually, but there is a recovery to some overvoltage at both ends of the line. The attenuation oscillation at different observation points lasts for a period of about 16 μ s, which is independent of the location of the observation points. However, the farther away from the trigger point, the longer the oscillation lasts.

中文翻译：

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10 kV配电线路40 m处人为触发雷感应过电压分布特征

本文介绍了2018年夏季广州从化地区10 kV配电线路不同观测点附近人为雷电引起的感应过电压。输电线路不同观测点测得的感应过电压波形具有明显的分布特征。规律性。三相过电压具有相似的波形特征，各观测点的感应过电压从负极性缓慢上升开始，数十微秒后可达到负峰值，然后在2～10秒内发生极性反转。μ s，达到正峰值后开始双极性周期性衰减振荡，最后降至0电平。根据波形特点，感应过电压波形可分为负峰值上升过程、极性转换过程和衰减振荡过程三个部分。随着观测点距闪电通道距离的增加，负峰值逐渐增大，且在接近线端处增大减慢；极性转换时间逐渐增加，峰峰值逐渐减小，但线路两端有一定的过电压恢复。不同观测点的衰减振荡持续时间约为16μ s，与观测点的位置无关。然而，距离触发点越远，振荡持续的时间越长。