Live Line Repair of Ground Wire for UHV/EHV Transmission Line Based on Helicopter Winch Hanging Chair Method

UHV/EHV transmission lines have large transmission capacity and high requirements for stable operation of the lines. There are some problems such as high labor intensity and high safety risks when climbing the tower to repair the ground wire. In this paper, based on the helicopter winch hanging chair (HWHC) method, the linesman is suspended by a hanging chair to repair the GW when the line is energized. According to the characteristics of UHV/EHV transmission lines, the way of the helicopter to the liveline is optimized. In this way, the suspension system and GW maintenance equipment are developed, thus repairing the broken strand live GW on 500kV transmission lines. Practice has proved the safety, reliability and high efficiency of helicopter winch hanging chair method. This method will apply more to broken strand of GW, which strongly supports the safe and stable of the power grid.