Work specification for the construction of 33kv overhead lines across a lagoon using equal level dead-end lattice tower supports
Bare overhead distribution conductors are typically flexible and uniform in weight along their lengths. This weight causes the span to form a catenary (sag) which changes with conductor temperature, ice, wind loading and time. This catenary is capable of tripping circuits because it often results to short circuit and da mage power system equipment with attendant loss of revenue to utility company. This paper presents a case study of 33kV overheadline construction crossing a 200m wide ‘Lagoon’ which requires minimum sag - tension design and estimation of Dead - End Lattice To wer weight specification that would determine weight of Tower foundation. These two parameters were obtained using the standard mathematical equations and the specifications for Aluminium Conductor Steel Reinforce (ACSR). The results of various Parameters evaluated in this research work are presented and discussed. The Sag and Tower weight results were applied to the proposed project which was successfully completed and commissioned.
Keywords : Aluminium Conductor, Catenary, Dead-End, Lattice Tower, Tripping Circuits, Parameters, Overhead Lines, Sag - Tension, Tower Weight, Tower Foundation, Steel Reinforce, Specifications.