Transformers Improvement and Environment Conservation by Using Synthetic Esters in Egypt

Ali A. Radwan, Ahmed A. Zaki Diab, Abo-Hashima M. Elsayed, Yehya S. Mohamed, Hassan Haes Alhelou and Pierluigi Siano
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Ali A. Radwan: Electrical Engineering Department, Faculty of Engineering, Minia University, Minia 61517, Egypt
Ahmed A. Zaki Diab: Electrical Engineering Department, Faculty of Engineering, Minia University, Minia 61517, Egypt
Abo-Hashima M. Elsayed: Electrical Engineering Department, Faculty of Engineering, Minia University, Minia 61517, Egypt
Yehya S. Mohamed: Electrical Engineering Department, Faculty of Engineering, Minia University, Minia 61517, Egypt
Hassan Haes Alhelou: School of Electrical and Electronic Engineering, University College Dublin, Dublin 4, Ireland
Pierluigi Siano: Department of Management and Innovation Systems, University of Salerno, 84084 Salerno, Italy

Energies, 2021, vol. 14, issue 7, 1-15

Abstract: Distribution transformer (DT) is a crucial component in power systems as it exchanges energies between different voltage levels or between utility grid and DC microgrids. Nevertheless, the operation of an oil-immersed DT is limited by the thermal and electrical capabilities of the internal insulating liquid. This paper aims to raise the efficiency of distribution transformers and preserve the environment by using a biodegradable insulating liquid instead of the conventional mineral insulating oil (MIO). This work examines the Egyptian case, where a real distribution network located in middle Egypt is selected as a pilot project. Study and analysis of the status que of the insulation system inside DTs are done with the aid of fault-tree analysis. The deficiency of the insulation system is confirmed by conducting an electronic survey of 100 expert participants. The most appropriate solution among three different alternatives is confirmed using the weighting and ranking method. The best choice suitable for the selected area is the substitution of MIO by synthetic ester (SE). The technical and environmental advantages achieved by the presented solution are discussed. The feasibility studies have proven that the solution is positively acceptable in all aspects. An execution plan is established for the application of proposed solution on the selected Egyptian distribution network.

Keywords: distribution transformers; mineral insulating oil; synthetic ester; natural ester; dry transformers; weighting and ranking; environment conservation; fault-tree; root-cause analysis; retrofilling (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2021
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