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Cooling system optimization and expected lifetime of large power transformers
Gradnik, Timotej ; Končan-Gradnik, Maja
The paper presents the most recent results of an experimental research in the area of ageing processes taking place in large power transformers paper in oil insulation. It explains the effect of the ...transformer oil and winding temperatures on the achievement of the expected transformer lifetime. These results and findings of two research studies made at the EIMV in 2004/2005, assessing ageing and cooling system state of large 400kV and 220kV transmittion transformers, provided the basis for highlighting the occurrence of unexpected early ageing of particular large transformers that were installed in the Slovenian power grid around 1980. Issues of teperature measurements and transformer cooling system control, associated with oil-forced type of transformer cooling system (OFAF), are discussed in detail.The paper also discusses the effect of cooling optimization in order to have transformer residual life-time extended and its life-cycle cost minimized.
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