Analysis and Design of A Lattice Transmission Line Tower with Vertical and Horizontal Configuration of Cross-Arms

Tower constitutes a very vital component of transmission lines. A single transmission line consists of many transmission towers. So, material saving in a single tower will lead to a considerable effect to the final cost of the project. The transmission line towers constitute about 28 to 42 percent of the cost of a transmission line. Therefore optimization in design of towers can bring about significant economy in the cost of transmission lines. Moreover, the increasing demand of electrical energy can also be met economically by developing different light weight configurations of transmission line towers. In this work, an attempt is made to make the transmission line more cost effective by changing the geometry (shape) of lattice transmission tower. To meet this objective a 132kV double circuit self-supporting angle tower is taken with vertical and horizontal configuration of cross-arms. A three-dimensional analysis of each of these different configuration towers has been carried out using STAAD.Pro.V8i software. Each of these tower members are then designed as an angle sections. It is to be noted that for optimizing any member section, the entire wind load computations have to be repeated thus the analysis and design process too simultaneously. Then, these two configurations of lattice tower are designed and compared.