Influence of Cooling Management to Transformer Efficiency and Ageing

Zarko Janic (), Nebojsa Gavrilov and Ivica Roketinec
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Zarko Janic: Končar Power Transformers, A Joint Venture of Siemens Energy and Končar, J. Mokrovića 12, HR-10090 Zagreb, Croatia
Nebojsa Gavrilov: Končar Power Transformers, A Joint Venture of Siemens Energy and Končar, J. Mokrovića 12, HR-10090 Zagreb, Croatia
Ivica Roketinec: Končar Power Transformers, A Joint Venture of Siemens Energy and Končar, J. Mokrovića 12, HR-10090 Zagreb, Croatia

Energies, 2023, vol. 16, issue 12, 1-15

Abstract: Transformer efficiency is a key concern for both transformer operators and regulators, particularly with regards to new transformers. Cooling is a critical factor in preventing overheating and controlling the ageing of transformer insulation. This paper aims to analyse how different cooling setups can influence efficiency. Transformer losses depend on the winding temperature, which is affected by load, ambient temperature, and cooling power. In this study, we will take all of these factors into consideration to examine their impact on transformer losses. Using a 520 MVA transformer as an example, we will calculate the loss levels under different realistic ambient temperature and load profiles. We will also apply different cooling system settings to determine the optimization possibilities. Our calculations will consider different turn-on temperatures of the fans and cooling stages and will use steady state calculations over a period of 12 months. Additionally, a novel approach to control cooling by using the loading of the transformer is present, as are the possibilities of using variable speed fans. Finally, we will estimate the influence of cooling settings on transformer ageing by examining their impact on temperature.

Keywords: transformer; loss; efficiency; cooling (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: 2023
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (3)

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