Abstract: In the case of compact towers for extra-high voltage (EHV) transmission lines, their structural dimensions are highly compact, and the operation window dimensions are relatively small. Consequently, when conducting equal-potential operations on such towers, there is an issue of inability to ensure the safety distance for operations, which poses a substantial safety hazard. For live-line maintenance on 500 kV AC double-circuit lines on the same tower, the techniques for entering and exiting the equal-potential state are intricate and require a significant amount of human resources. When it is necessary to enter the equal-potential state for all three phases to address defects, it is not only time-consuming but also laborious. This paper presents a novel technique for entering and exiting the equal-potential state. A flight path for an unmanned aerial vehicle (UAV) to throw a rope for double-circuit lines on the same tower is designed. This enables the separate entry and exit of the equal-potential state for each of the three phases by using an electric lifting device after a single rope throw. Through the coordinated use of various tools and equipment, such as UAVs, electric lifting devices, special insulating anti-friction devices, insulating traction ropes, special insulating climbing ropes for lifting devices, and personal backup safety ropes, an operation model is achieved in which the equal-potential operations for the three phases of the line can be completed with just one UAV rope throw.