Research on Effect of Shield Wire for 10 kV Distribution Lines via Triggered Lightning

This article studies the performance of lightning-induced overvoltage (LIV) on a 1513-meter-length overhead distribution line in the absence or presence of shield wire, via a rocket-triggered lightning observational experiment. The variation of overvoltage at the pole nearest to the lightning channel are analyzed. It’s found that whether the shield wire is installed or not has little influence on the waveform characteristics of the induced overvoltage, but mainly affects the voltage amplitude. The shield wire primarily reduces the positive peak value and peak-to-peak value but has little influence on the negative peak value. The impact of shield wire on amplitude is analyzed by using the ratio of the average statistical data under the condition with or without shield wire. For peak-to-peak value, the closer to the shield wire, the smaller the ratio is, the ratio of phase A is about 0.78, while the ratio of phase C is about 0.88.