Power Research

Veerendra Kumar Shukla ¹, M. Selvaraj ¹

Affiliations
1 Mechanical Engineering Division, CPRI, Bangalore – 560080, Karnataka, IN

Abstract

For transmission of electricity from power generation plant to substations, 4-legged lattice towers and monopoles are widely used, but the monopoles are much costlier than 4-legged lattice towers. To avoid the use of monopoles, in the present work, an approach has been adopted to use a special lattice type structure with eight legs. A 220kV multi-circuit suspension tower with 0 to 2^o deviation has been considered for present study. The detail explanations, like, tower geometry, load calculations, analysis and design of the proposed structure has been covered in the paper. It has been observed that land requirement can be considerably minimized by use of the proposed 8-legged tower. The cost of the 8-legged tower is slightly higher than a 4-legged tower but much lesser than that of monopoles as the total weight of steel required is very less as compared to monopole. The results obtained from the study of the proposed tower have been compared with 4-legged tower and monopole. This paper discusses the feasibility of using the transmission line tower with 8-legs. The paper also discusses a comparative study of cost, right of way, height and base width of 4-legged tower and monopole with proposed 8-legged tower.

Keywords

Compact Lattice Tower, Land Cost, Monopole, Right of Way, 8-legged Tower

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M. Selvaraj ¹, Veerendra Kumar Shukla ¹

Affiliations
1 Mechanical Engineering Division, Central Power Research Institute (CPRI), Bangalore – 560080, Karnataka, IN

Abstract

Towers are the most important component of the overhead power transmission line system. When failure occurs, direct and indirect losses are very high; hence accurate prediction of tower failure becomes very important for the reliability and safety of the transmission system. One cannot accurately predict the behavior of tower after practical loading conditions, so testing of tower for various loading conditions before installing in field becomes very important. The present paper discusses the structural behavior of towers during full scale testing carried out at Central Power Research Institute, Bangalore, India. Although, the towers were safe for various loading conditions based on the design/analysis, during full scale testing, different types of premature failures were observed. Necessary modifications in towers have been carried out and these towers were retested successfully. The details of remedial measures/strengthening of members carried out during testing are brought out in this paper.

Keywords

Broken Wire Condition, Normal Condition, Redundant Members, Transmission Line Towers.

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