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Distribution Transformers Relocation to Enhance their Utilization Factor in Electricity Distribution Networks-Definition, Advantages, Disadvantages, Operation, and Planning Considerations

Azimi Hosseini, Kamyar | 2022

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 54781 (05)
  4. University: Sharif University of Technology
  5. Department: Electrical Engineering
  6. Advisor(s): Vakilian, Mehdi; Hajipour, Ehsan
  7. Abstract:
  8. The short-term expansion planning of the private utilities, as well as the emerging technologies such as photovoltaic panels (PVs), plug-in hybrid electric vehicles (PHEVs), cryptocurrency mining, and storage elements spread, make the long-term load estimation of distribution transformers (DTs) noticeably imprecise. In response, the number of overload and underload transformers is growing in recent years. The utilities normally analyze the loading of their DTs annually to determine the DTs, which should be replaced. The simplest, but expensive way is to substitute them with the newly purchased DTs. However, financial profit motivates the utilities to relocate in-service undersized and oversized DTs with each other. In this thesis the relocation concept is investigated in the three point of views as follows:In the first chapter, an optimal plan to replace or relocate a large number of DTs in minimum time and cost is proposed;Second chapter proposes a relocation-based strategy using a mixed integer linear programming (MILP) formulation, in which the total transportation costs of these DTs relocations, as an objective function, is minimized;And finally the third chapter presents the outcome of a study on how the planned DTs relocation can save asset managers against their huge DTs replacement costs developed due to the highly overloaded DTs failures in a utility, and how it will improve the overall reliability of the DTs
  9. Keywords:
  10. Asset Management ; Reliability ; Maintenance ; Linear Programming ; Distribution Transformer ; Distribution Transformer Replacement ; Photovoltaic Panels

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