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The National Academy of Sciences of Ukraine

The Institute of Electrodynamics

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A.S. Levytskyi, A.I. Novik, Ye.O. Zaitsev
Institute of Electrodynamics of the National Academy of Sciences of Ukraine,
Peremohy, 56, Kyiv-57, 03680, Ukraine,
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This paper present the method of considerable reduction of measuring error of efforts in the turbogenerator tightening prisms with the use of resilient element and capacity sensor with variable gap is considered. The error, which was as result of arising up from out-of-parallelism of flat sensor circular electrodes, is analyzed. Correlations of sizes external and internal electrodes at that basic constituent of error of transformation "microdisplacement – reciprocal of electric capacity" transforms into an infinitesimal are found. The ratio of size of the external and internal ring electrodes at that basic constituent of error of transformation "microdisplacement – reciprocal of electric capacity "transforms into an infinitesimal are found. The use of concept "Coefficient of defect" for simplification of determination and size estimation out-of-parallelism of electrodes regardless of their geometrical sizes is proposed. Efficiency of the proposed method of correction depending on the coefficient of circular electrodes defect is analysed. It is shown that the relative error of measuring at the large angles of defect diminishes in several times, and at small - in several hundred one times. References 7, figure 1, table 1.
Key words: turbogenerator, stator core, tightening prism, effort, capacity sensor, out-of-parallelism of electrodes, error.

1. Grinevich F.B., Lezhoev R.S. Error compensation caused by non-parallelism of the electrodes of a capacitive sensor. Tekhnicheskaya elektrodinamika. 1988. No 5. P. 68-71. (Rus)
2. Levytskyi A.S., Fedorenko G.M., Gruboi O.P. Control of a state of powerful hydro- and turbine generators with the help of capacitive measuring instruments of the parameters of mechanical defects. Kyiv: Instytut elektrodynamiky NAN Ukrainy, 2011. 242 p. (Ukr)
3. Tytko O.I., Mystetskyi V.A. Mathematical model, methods, and results of the effort calculation in the coupling prisms of the stator core of turbogenerator in -the presence of defects based on the three-moment method. Pratsi Instytutu elektrodynamiky NAN Ukrainy. 2014. No 39. P. 38–44. (Ukr)
4. Fomin B.P., Tsykhanovych B.G., Viro G.M. Technology of a large electrical engineering. Turbogenerators. Leningrad: Energoizdat, 1981. 392 p. (Rus)
5. Shtorgin A.V. Technical and scientific measures to reduce a damage to stators of heavy turbogenerators caused by vibration in the end zones: Diss. ... candidate of technical sciences: 05.11.05. Kiev, 2015. 161 p. (Rus)
6. Heerens W.C. Multi-terminal capacitor sensors. Journal of Physics E. Scientific Instruments. Vol. 15. 1982. P. 137-141. DOI:
7. Polyanin A.D., Manzhirov A.V. Handbook of mathematics for engineers and scientists. Boca Raton, FL: Taylor & Francis Group, LLC. 2007. 1543. Avaible at: Handbook_of_Mathematics_for_Engineers_and_Scientists.pdf (accessed 24.05.2017).