Design Parameters Specification for the Construction of 33kV Overhead Lines across Lagoon Using Transmission Towers
Overhead aluminium conductors used for both medium and high voltage installations are flexible and uniform in weight along their lengths. They often take the form of catenary changes with conductor temperature, ice and wind loading and time. Adequate vertical and horizontal clearance under all weather and electrical loading conditions are guaranteed by ensuring the breaking strength of the conductor is not exceeded. Thus, the behaviour of the conductor catenary under all conditions need to be incorporated into the transmission line in the constructional design regardless of the length of the transmission line. Overhead transmission lines constructed across water such as Lagoon are good illustration of the characteristics described above. Therefore, this research presents a case study of 33kV overhead line construction crossing 265 m wide ‘Lagoon’ which requires Sag parameter calculations. Detail description of the case study, specifications for Aluminium conductor steel reinforced (ACSR) type A1/S1A IEC 61089 standard and sag calculations with and without wind or ice weather conditions are presented. The design calculation for weight of a required Dead-End Lattice Tower via determination of weight of the individual 5 components of a Tower are also presented. The obtained results are presented and discussed. The Sag parameter results and that of Dead-end lattice tower and its components weights evaluated were applied to the proposed project. The method of this research work generated reliable results suggesting that it can be applied to any other Transmission tower successfully.
Dr. Lambe Mutalub Adesina
Department of Electrical and Computer Engineering, College of Engineering and Technology, Kwara State University, Malete, Ilorin, Nigeria.
Tolulope O. Akinbulire,
Department of Electrical and Electronics Engineering, Faculty of Engineering, University of Lagos, Akoka, Lagos, Nigeria.
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