Transposition Tower

Transposition Tower

Transposition towers are specially used for transpose the conductors of three-phase line . Transposition arrangement also called as span transposition. These type of towers are widely used in long transmission line. These types of towers are much less use in recently. Major idea behind transposition is the change the three-phase according to determined arrangement to obtain better performance in Transmission line.   There are several types of transpositions arrangements use in electrical transmission industry. On span transposition is one of the transposition arrangement which use to carried out near a tension tower due to greater ground clearance available near the tower than in the mid span of the tower.

The tower selection of transmission lines in mountainous areas is often limited by steep terrain. Conventional technology will lead to construction difficulties and safety risks caused by exposed foundation, as well as serious damage to the original landform. The route length of transmission lines will increase and the project investment will increase by adopting the method of rerouting.The ability of transmission towers to adapt to steep terrain in mountainous areas can be improved at no additional cost by designing a transposed tower for use in single-loop linear towers of 220V transmission lines.   Under the condition that the orientation of the tower head remains unchanged, a transfer layer is set at the connection between the tower head and the tower body to realize a certain rotation Angle of the tower body relative to the tower head, so as to improve the configuration of the difference between the tower legs and make the originally limited tower position meet the conditions of tower erection. For steep slope terrain, the use of transposition tower technology, the tower can adapt to the slope increased from 30° to 40°, improve the adaptability to the terrain, reduce the mountain opening, at the same time make it possible to optimize the route, and then reduce the length of the path, reduce the number of towers. Compared with the conventional tower, the weight of the 220 k V single loop transposed tower is increased by about 3.5%, but the overall project investment in the section is reduced by about 30.8%. At the same time, it improves the effect of environmental protection and soil and water conservation, and ensures the advanced nature and economy of the transposed tower design technology.

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