Browsing by Author "T. O. Akinbulire"

Now showing 1 - 2 of 2
  • Thumbnail Image
    Item
    Development of an improved Earthing Method for Power and Distribution Transformers Substations.
    (University of Nigeria Press Ltd, University of Nigeria, Nsuka, 2018-07-01) L. M. Adesina; T. O. Akinbulire
    BSTRACT Engineers and planners have realized that equipment grounding is a necessary part of installation process in Electrical power substations. Over years, grounding or earthing has been carried out primarily through preparation of Earth Mat which is interconnected with several Earth-rods buried around the equipment under consideration. This approach takes several efforts to have an acceptable and reliable result. However, this paper presents a more flexible, economical and results oriented approach. A flow chart which describes the procedures of carrying out the proposed method of earthing is developed. This was applied to two case studies: a proposed Power transformer substation and distribution Transformer substation located within the same geographical domain. On the two cases, the measured earth resistances are presented and discussed. The results from the case study indicates that the earth resistance values obtained from this new approach are reliable and in compliance with IEEE Standards 80,142, 81 and 1100.
  • Thumbnail Image
    Item
    Work Specification for the Construction of 33kV Overhead lines across a Lagoon using Equal Level Dead – End Lattice Tower Supports.
    (University of Nigeria Press Ltd, University of Nigeria, Nsuka, Nigeria., 2018-01-01) L. M. Adesina; T. O. Akinbulire
    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 damage power system equipment with attendant loss of revenue to utility company. This paper presents a case study of 33kV overhead line construction crossing a 200m wide ‘Lagoon’ which requires minimum sag-tension design and estimation of Dead-End Lattice Tower 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.