Transposition tower is a facility in the field of electrical engineering transmission line engineering that allows wires to change their relative positions along the direction of the line. It achieves three-phase current balance by adjusting the spatial position exchange of wires, and its main functions include reducing the asymmetry of current and voltage in the power system, and limiting the electromagnetic interference of transmission lines on adjacent communication lines. The transposition methods include cyclic transposition, straight pole transposition, tension tower transposition, and suspended transposition. Among them, straight pole transposition is suitable for areas with ice thickness ≤ 10 millimeters,  while tension tower transposition is mostly used in heavy ice areas. According to the design specification GB50545-2010, lines with a length exceeding 100 kilometers in a neutral point directly grounded power grid should be swapped, and the swapping cycle length should not exceed 200 kilometers. The height of the transposition tower can reach 100 meters, and the conductor adopts an eight split structure. The transposition needs to be achieved through methods such as cross jumping of insulator strings or tower displacement. In construction applications, State Grid Corporation of China relocated 31 transposition towers in the frozen wetland of Daqing Reservoir in Daqing City,  Heilongjiang Province in 2017. Each tower is over 50 meters high and weighs more than 60 tons, and more than 400 people are deployed daily to complete the operation.