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ABSTRACT: In order to design the power apparatus such as bus bar or power
cable, the current carrying capacity (or ampacity) should be determined
exactly since it is limited by maximum operating temperature. The
temperature rise in the power apparatus is due to Joule's loss in the
current carrying conductor and due to the induced eddy current in the
tank. This paper presents a new technique that can be used to estimate
the temperature rise in the extra high voltage bus bar. In this paper,
the power losses are calculated from the magnetic field analysis for
various materials when ac current flows into the single- and three-phase
bus bar and are used as the input data to predict temperature rise for
the thermal analysis. However, it is not easy to apply the heat transfer
coefficient on the boundaries correctly, because the coefficient is not
a constant, but depends on temperature as well as model geometry, etc.
The heat transfer coefficient is calculated according to the model
geometry and varying temperature and is coupled with the finite element
method. The temperature distribution in the bus bar by proposed method
shows good agreement with the experimental data, compared to that of the
analytic method using fixed coefficient
IEEE Transactions on Magnetics 04/2002; · 1.36 Impact Factor
