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Selection the Optimum Cooling Scheme for Generators based on the Electro-Thermal Analysis

Authors: Diako Azizi, Ahmad Gholami, Vahid Abbasi


Optimal selection of electrical insulations in electrical machinery insures reliability during operation. From the insulation studies of view for electrical machines, stator is the most important part. This fact reveals the requirement for inspection of the electrical machine insulation along with the electro-thermal stresses. In the first step of the study, a part of the whole structure of machine in which covers the general characteristics of the machine is chosen, then based on the electromagnetic analysis (finite element method), the machine operation is simulated. In the simulation results, the temperature distribution of the total structure is presented simultaneously by using electro-thermal analysis. The results of electro-thermal analysis can be used for designing an optimal cooling system. In order to design, review and comparing the cooling systems, four wiring structures in the slots of Stator are presented. The structures are compared to each other in terms of electrical, thermal distribution and remaining life of insulation by using Finite Element analysis. According to the steps of the study, an optimization algorithm has been presented for selection of appropriate structure.

Keywords: Finite Element Method, insulation, winding, Electrical field, field distribution, electro thermal

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[1] P. O-Donnell, "Report of large motor reliability survey of industrial and commercial installations: Part I," IEEE Trans. Ind. Appl., vol. IA- 21, no. 4, pp. 853-864, 1985.
[2] P. F. Albrecht, J. C. Appiarius, and D. K. Sharma, "Assessment of reliability of motors in utility applicationsÔÇöUpdated," IEEE Trans. Energy Convers., vol. EC-1, no. 1, pp. 39-46, Mar. 1986.
[3] Diako Azizi, Ahmad Gholami, Abolfazl Vahedi, ÔÇÿÔÇÿAnalysis of the deterioration effects of stator insulation on the its electro-thermal property--, International Journal of Electrical Power and Energy Systems Engineering., vol. 2, no. 3, 2009.
[4] G. C. Montanari and M. Cacciari, ÔÇÿÔÇÿA probabilistic insulation life model for combined thermal-electrical stresses--, IEEE Transactions on Electrical Insulation vol. EI-20 no.3, June 1985.
[5] G. J. Anders, SM J. Endrenyi, F G.L. Ford, M G.C. Stone, SM, ÔÇÿÔÇÿA probabilistic model for evaluating the remaining life of electrical insulation in rotating machines--, lEEE Transactions on Energy Conversion, vol. 5, no. 4, December 1990.
[6] S.B.Pandey, ÔÇÿÔÇÿEstimation for a life model of transformer insulation under combined electrical & thermal stress--, IEEE Transaction on reliability. vol.41, no.3, 1992 September.
[7] H.S.Endicott, B.D.Hatch, R.G.Sohmer, ÔÇÿÔÇÿApplication of eyring model to capacitor aging data--, IEEE Trans. Component parts, vol 12, 1965 Mar, pp 34-41.
[8] T.S.Ramu, ÔÇÿÔÇÿOn the estimation of life power apparatus insulation under combined electrical and thermal stress-, IEEE Trans. Electrical insulation, vol EI-20, 1985 Feb, pp 70-78.