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A Statistical Identification Approach by the Boundary Field Changes
Abstract:In working mode some unexpected changes could be arise in inner structure of electromagnetic device. They influence modification in electromagnetic field propagation map. The field values at an observed boundary are also changed. The development of the process has to be watched because the arising structural changes would provoke the device to be gone out later. The probabilistic assessment of the state is possible to be made. The numerical assessment points if the resulting changes have only accidental character or they are due to the essential inner structural disturbances. The presented application example is referring to the 200MW turbine-generator. A part of the stator core end teeth zone is simulated broken. Quasi three-dimensional electromagnetic and temperature field are solved applying FEM. The stator core state diagnosis is proposed to be solved as an identification problem on the basis of a statistical criterion.
Digital Object Identifier (DOI): doi.org/10.5281/zenodo.1060279Procedia APA BibTeX Chicago EndNote Harvard JSON MLA RIS XML ISO 690 PDF Downloads 988
 H. Karmakersi, "An experimental study of electromagnetic field distribution in large machines", Int. conf. on the evolution and modern aspects of synchronous machines, Zurich, Suitzerland, Aug. 1991, pp. 522-524.
 Silva, V., G. Meunier and A. Foggia, "A 3D finite-element computation of eddy currents and losses in the stator end laminations of large synchronous machines", IEEE Trans. Magn., vol. 32, No. 3, 1996, pp.1569-1572.
 Mecrow, B., G. Jack and C. Cross, "Electromagnetic design of turbogenerator stator end regions", IEE Proceedings, Part C, vol. 136, No. 6, 1989, pp.146-149.
 Schastlivyi, G.,G..Fedorenko and V..Vigovskyi,"Turbo and hydro generators under variable regimes", Kiev, Naukova dumka, in Russian, 1985.
 Stancheva, R., "Statistical analysis application for the solution of some inverse problems in electrical devices", 5th International Conference on Applied Electromagnetics PES 2001, Nish, Yugoslavia, 2001, pp.143- 146.
 Stancheva, R. and I. Iatcheva, "Numerical determination of operating chart of large turbine generator", Int. Conf.on Electr. Machines ICEM-2002, Book of Abstr., Full text on CD, Brugge-Belgium, 2002, pp. 329.
 Stancheva, R. and I. Iatcheva, "Investigation of the electromagnetic field in the turbine-generator end region considering the anisotropy". Electrical Engineering and Electronic, 1-2, Bulgaria, 1995, pp.6-11.
 Stancheva, R. and I. Iatcheva, "Turbogenerator stator core faults diagnosis on load, International Agean conference on electrical machines and Power electronics, ACEMP 2004, Istanbul, Turkey, 2004, pp. 30-35.
 Smirnov, N., I. Dunin-Barkovski. Course of Probability and Mathematical Statistics, Science, M., in Russian, 1969.