Development Of Thermal And Structural
Design Technology For A Hermetically Sealed
Oil Transformer
Author(s)
S. Lee, J. Y. Lee, J. C. Yun, J. Y. Park & J. H. Woo
Abstract
The hermetically sealed oil transformer is designed by applying the expanding
function of the tank due to the volume change of the insulation oil according to
the temperature rise. When insulation oil expands, increase in the volume of
corrugated-fin prevents pressure rise of the transformer. The purpose of this
study is to analyze the thermal and structural stability of the transformer to deal
with the pressure variation due to the temperature change. For the wind turbine
transformer, the vegetable oil transformer has advantages of excellent
biodegradation and fire-resistant properties, such as an exceptionally high fire
point. Therefore, the design technology of the transformer to deal with the
pressure variation has been investigated by fluid structure interaction
simulations. The amount of expanded oil inside the corrugated-fin has been
estimated for operating load cases, and the design of the corrugated-fin to control
the variations of the inside oil pressure has been proposed. Additionally, the
structural integrity of a hermetically sealed transformer has been evaluated by
both numerical and experimental methods. Hydraulic and thermal tests for the
transformer have been performed, and measured values are compared with the
analyses results.
Keywords: hermetically sealed transformer, vegetable oil, corrugated-fin, oil
expansion calculation.
Keywords
hermetically sealed transformer, vegetable oil, corrugated-fin, oil
expansion calculation
Related Book
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