Commenced in January 2007
Paper Count: 31105
Improvement of Stator Slot Structure based on Insulation Stresses Analysis in HV Generator
Abstract:High voltage generators are being subject to higher voltage rating and are being designed to operate in harsh conditions. Stator windings are the main component of generators in which Electrical, magnetical and thermal stresses remain major failures for insulation degradation accelerated aging. A large number of generators failed due to stator winding problems, mainly insulation deterioration. Insulation degradation assessment plays vital role in the asset life management. Mostly the stator failure is catastrophic causing significant damage to the plant. Other than generation loss, stator failure involves heavy repair or replacement cost. Electro thermal analysis is the main characteristic for improvement design of stator slot-s insulation. Dielectric parameters such as insulation thickness, spacing, material types, geometry of winding and slot are major design consideration. A very powerful method available to analyze electro thermal performance is Finite Element Method (FEM) which is used in this paper. The analysis of various stator coil and slot configurations are used to design the better dielectric system to reduce electrical and thermal stresses in order to increase the power of generator in the same volume of core. This paper describes the process used to perform classical design and improvement analysis of stator slot-s insulation.
Digital Object Identifier (DOI): doi.org/10.5281/zenodo.1080804Procedia APA BibTeX Chicago EndNote Harvard JSON MLA RIS XML ISO 690 PDF Downloads 1521
 F. Tim Emery and Dennis Pavlik, "Electrostatic field analysis of high voltage generator stator insulation systems" 2000 conference on electrical insulation and dielectric phenomena, IEEE.
 Muhammad Arshad, Abdul Khaliq and Syed M. Islam, "Turbo generator stator winding condition assessment",2004 international conference on power system technology, POWERCON 2004, Singapore, 21-24 November 2004.
 Sang Bin Lee, Jinkyu Yang, Karim Younsi and Raj Mohan Bharadwaj, ÔÇÿAn On-Line groundwall and phase to phase insulation quality assessment technique for AC machine stator winding-, IEEE Transactions on Industry Application, vol. 42 no.4, July/August 2006.
 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.
 ÔÇöÔÇö, "Report of large motor reliability survey of industrial and commercial installations: Part II," IEEE Trans. Ind. Appl., vol. IA-21, no. 4, pp. 865-872, 1985.
 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.
 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.
 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.
 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.
 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.
 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.
 Diako Azizi, Ahmad Gholami, Abolfazl Vahedi, ÔÇÿÔÇÿAnalysis of the deterioration effects of stator insulation on the its electro-thermal property--, International Journal of Energy and Power Engineering., vol. 2, no. 3, 2009.