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The National Academy of Sciences of Ukraine

The Institute of Electrodynamics

About Institute



K.A. Kuchynskyi1*, V.A. Kramarskyi1, D.I. Hvalin2**, V.A. Mystetskyi1
1- Institute of Electrodynamics of the National Academy of Sciences of Ukraine,
pr. Peremohy, 56, Kyiv, 03057, Ukraine,
2- Institute for Safety of Problems of Nuclear Power Plants of the National Academy of Sciences of Ukraine,
Lysogirska str., 12, Kyiv, 03028, Ukraine,
e-mail: This e-mail address is being protected from spambots. You need JavaScript enabled to view it

With the help of mathematical simulation of mechanical processes in the stator core fastening system of a powerful turbogenerator end zone obtained appropriateness of basic parameters changes at the break of clamp prisms heads of the stator core. It is determined that the sudden break of one or more clamp prisms leads to longitudinal oscillation of their other working heads and stiff connected with them press plate, accordingly. Although such oscillation is insignificant but propagates along the entire surface of the press plate with a maximum value in the break zone and subsequent decrease with distance from this zone and therefore can be detected with the help of existing vibration sensors by installing them on the press plate. It is possible to use a limited number of sensors due to the propagation of vibration along the entire surface of the plate. But because the vibration changes are insignificant, in this case, there is a complexity of control that requires the use of high-sensitivity sensors and great informative computing equipment. According to the sensors indices, it is possible to determine the number of breaks for clamp prisms heads of the stator core and the number of them working heads, accordingly. Besides, this effect can be used to diagnose the un-compression of the stator core tooth zone. Since one of the important ways to improve the control and diagnostics of turbogenerators is the detection, the presence of such knowledge will allow making the optimal decision for further measures. References 8, figures 8, tables 2.
Key words: turbogenerator, mathematical simulation, end zone, stator core, fastening system, mechanical damage, diagnostics.

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2. Yoshihiko I., K. Takahashi. Finite element modeling of turbine generator stator end windings for vibration analysis. .Electr. Power Appl. 2016. Vol. 10. Iss. 2. Pp. 75–81. DOI:
3. Kuznecov D. V. Development of methods for processes research in the stator cores fastening units to a turbogenerators housings and improvement in their diagnostics under operation conditions: abstract of thesis. Ph.D. Moscow. 2009. 25 p. (Rus.)
4. Mistetskyi V. A. A mathematical model and methods of calculation for efforts in coupling prisms of a turbogenerator stator core at the presence of defects on basis the method of absolutely solid body. Pratsi Instytutu elektrodynamiky NAN Ukrainy. 2013. No 34. Pp. 34–41 (Rus.)
5. Postnikov I. M., Stanislavskyi L. Ya., Schastlivyi G. G. (1971). Electromagnetic and thermal processes in the end parts of powerful turbogenerators. Kiev: Naukova dumka, 360 p. (Rus.)
6. Firsanov E. P. Research of thermo-mechanical processes in the one-dimensional system of rectilinear mechanically connected bars. URL: http://www/ (Rus.)
7. Fesik S. P. Handbook of materials resistance: Kiev: Budivelnik, 1982, 280 p. (Rus.)
8. Titko O. I., V. A. Mystetckyi. The analysis for effect of destroyed pins quantity of a turbogenerator stator on the mechanical characteristics of coupling prisms . Pratsi Instytutu elektrodynamiky NAN Ukrainy. 2015. No 40. Pp. 85–90 (Ukr.)

Received 27.06.2020