Analysis and cost-Effective Design of Transmission Line Tower Structure

Transmission towers are very important components of power transmission systems, as they support overhead conductors and maintain safe clearance from the ground. These towers are subjected to various types of loads such as dead load, live load, and wind load, which significantly affect their structural behaviour. In the present study, the analysis and design of 220kV and 132kV transmission towers are carried out using STAAD Pro software. The towers are modelled as three-dimensional steel lattice structures, and the loads are applied as per relevant Indian Standard codes such as IS 802 and IS 875 (Part 3). Different load combinations are considered to identify the most critical loading condition. The analysis results include parameters such as displacement, support reactions, and bending moments. It is observed that the 220kV tower shows higher displacement and reaction values compared to the 132kV tower due to its greater height and exposure to wind load. The design of both towers is performed as per IS 802, and all members are found to be safe under the applied loads. The steel take-off is also calculated, which shows that the 220kV tower requires more steel than the 132kV tower, making it less economical. The study concludes that while 220kV towers are suitable for long-distance transmission, 132kV towers are more stable and cost-effective for medium-range applications.