Characteristics of Ground Wire Voltages Along Transmission Line Under Lightning Strikes

Harvesting power from ground wires is a promising solution for the power supply problem of online monitoring device on the overhead transmission lines. Nevertheless, this method is more likely to suffer lightning overvoltage or overcurrent due to the position of power harvesting device. In order to promote the reliability of harvesting power from ground wires, this paper studies the ground wire voltages under different lightning strike situations with different ground wire connection methods. Meanwhile, the influence of lightning current waveform, span and tower impulse resistance is also studied in this paper. The results of this paper can guide the design of overvoltage protection module of the power harvesting device on the ground wire.