{"references": ["S.L.M. Berleze, R. Robert, \"Skin and proximity effects in nonmagnetic\nconductors, \" IEEE Transactions on Education, vol. 46, No. 3, 2003, pp.\n368\u2013372.", "S.L. Ho, Y. Li, E.W.C. Lo, J.Y. Xu, X. Lin, \"Analyses of threedimensional\neddy current field and thermal problems in an isolated\nphase bus,\" IEEE Trans. Magn.vol. 39, 2003, pp, 1515-1518.", "W. Anbo, C. Degui, S. Member, W. Jianhua, C. Bin, G. Yingsan,\n\"Evaluation of Thermal Performance for Air-insulated Busbar Trunking\nSystem by Coupled Magneto-fluid-thermal Fields,\" Proc. Int. Conf.\nPower System Technology, 2002, pp. 2159-2163.", "M.A. Prsa, K.K. Kasas-Lazetic, N.D. Mucalica, \"Skin Effect and\nProximity Effect in a Real, High Voltage, Double Three-phase System,\"\nProc. IEEE EUROCON, 2011, pp. 1-4.", "T. Keikko, J. Kotiniitty, L. Korpinen, \"Calculations of Magnetic Fields\nfrom Indoor Distribution Substation Busbars,\" IEEE PES Summer\nPower Meeting 4, 2000, pp. 2309-2314.", "A. Ovcharov, A. Krumov, D. Todorov, Manual for laboratory exercises\non electrical part of stations and substations, Sofia, 2009. (In Bulgarian)", "QuickField 5.6 User's Guide."]}

The paper presents coupled electromagnetic and thermal field analysis of busbar system (of rectangular cross-section geometry) submitted to short circuit conditions. The laboratory model was validated against both analytical solution and experimental observations. The considered problem required the computation of the detailed distribution of the power losses and the heat transfer modes. In this electromagnetic and thermal analysis, different definitions of electric busbar heating were considered and compared. The busbar system is a three phase one and consists of aluminum, painted aluminum and copper busbar. The solution to the coupled field problem is obtained using the finite element method and the QuickField™ program. Experiments have been carried out using two different approaches and compared with computed results.