Mechanical engineering and transport

Power Accumulator for Stabilizing the Pressing Pressure of Powerful Turbogenerator Stator Core with a Fiber-Optic Force Meter in the Clamping Prisms

Authors

A. S. Levytskyi
Institute of Electrodynamics of the National Academy of Sciences of Ukraine, Kyiv
Ye. O. Zaitsev
Institute of Electrodynamics of the National Academy of Sciences of Ukraine, Kyiv
N. L. Sorokina
Institute of Electrodynamics of the National Academy of Sciences of Ukraine, Kyiv
DOI https://doi.org/10.31649/1997-9266-2023-169-4-61-67

Keywords

powerful turbogenerator stator cores compression pressure power accumulator block of plate springs fiber optic sensor with Bragg gratings forces in clamping prisms

Abstract

The paper describes the advantages and features of using power accumulators (PA) for powerful turbogenerators (TG), in which plate spring blocks are used to restore and stabilize the compression pressure of the stator core. Groups of PA are installed under the clamping nuts or instead of them on the threaded ends of the clamping prisms of the core. Measuring the forces of the clamping prisms in PA makes it possible to estimate the current state of the compression pressure in the core. To measure forces at clamping prisms the construction of PA with a fiber optic sensor based on Bragg gratings is proposed. The use of an optical sensor, which is a Bragg grating, ensures the efficiency of measuring forces in the clamping prism and compression pressure. Moreover, the proposed measuring transducers have immunity to influence of powerful electromagnetic fields, which occur during the operation of powerful generators. According to the given design parameters of the PA and mechanical characteristics of the plate spring block, a fiber optic force measurement sensor was developed and its characteristics were determined. The forces in the prisms is measured using a dielectric tubular force-receiving element and a ring measuring elastic element connected to it by light tension. Structural diagram of fiber-optic system with Bragg gratings for measuring forces in N clamping prisms of a powerful TG is proposed. The method of monitoring the state of the TG stator core using the PA system with a fiber-optic sensor, based on Bragg gratings is described. The processing of the measurement results in the clamping prisms is carried out , using a fiber-optic sensor, based on Bragg gratings, located in the PA , using an interrogator and a personal computer. The use of the device in the stabilization system makes it possible to increase the reliability and efficiency of monitoring the actual technical condition of the core, as well as more reliably to diagnose its defects with their subsequent elimination, both during its operation and during preventive and repair measures. The use of the developed information and measurement tools will ultimately increase the reliability of TG and its durability.

300 146

How to Cite

[1]
“Power Accumulator for Stabilizing the Pressing Pressure of Powerful Turbogenerator Stator Core with a Fiber-Optic Force Meter in the Clamping Prisms”, Вісник ВПІ, no. 4, pp. 61–67, Aug. 2023, doi: 10.31649/1997-9266-2023-169-4-61-67.

Author Biographies

A. S. Levytskyi, Institute of Electrodynamics of the National Academy of Sciences of Ukraine, Kyiv

Dr. Sc. (Eng.), Senior Researcher, Leading Scientist of the Department of Theoretical Electrical Engineering and Diagnostics of Electrical Equipment

Ye. O. Zaitsev, Institute of Electrodynamics of the National Academy of Sciences of Ukraine, Kyiv

Dr. Sc. (Eng.), Senior Researcher, Head of the Department of Theoretical Electrical Engineering and Diagnostics of Electrical Equipment

N. L. Sorokina, Institute of Electrodynamics of the National Academy of Sciences of Ukraine, Kyiv

Senior Engineer of the Department of Theoretical Electrical Engineering and Diagnostics of Electrical Equipment

References

K. Engvall, and G. Csaba, “Nordic nuclear power generator stator vibration,” Stockholm, Sweden: Energiforsk, 2019.
А. С. Левицький, Є. О. Зайцев, К. О. Кобзар, і В. О. Тітко, Методи та засоби контролю стану спресованості осердя статора потужних турбогенераторів, Київ, Україна: Наукова думка, 2023. https://doi.org/10.15407/978-966-00-1846-4 .
Ю. В. Зозулін, та ін., Створення нових типів та модернізація діючих турбогенераторів для теплових електричних станцій. Харків, Україна: ПФ «Колегіум», 2011.
J. A. Cook, and D. T. Allen, “Method and apparatus for measuring compressionstator core,” U.S. Patent 7.946,023 B2, 24.05.11.
M. Twerdochlib, D. Edward, and E. V. Diatzikis, “Bolt tightener device for tightening a through-bolt in a generator core,” U.S. Patent 9,016,991 B2, 28.04.2015.
T. Paspalovski, and V. Jovanovska, “Partial replacement of the active steel on the turbogenerator end zone,” Termotechnika, vol. 41(1), pp. 1-7, 2015. https://doi.org/10.5937/termoteh1501001P .
T. Paspalovski, N. Mojsoska, N. Jovanovski, V. Jovanovska, and Z. V. Sovreski, “Replacement (reconstruction) of the active steel end zone of the turbogenerator,” in 1-st Global. Conference Proceedings, 2013, pp. 659-663. https://doi.org/10.13140/RG.2.1.2948.3047 .
V. Jovanovska, and M. Arapcheska, “Increasing the power of the turbogenerator in the process of modernization in the mining and energy industry,” International Journal of Innovative Science, Engineering & Technology, vol. 2(2), pp. 162-166, 2015.
А. С. Левицький, «Контроль зусиль у стяжних призмах осердя статора потужних генераторів з використанням ємнісних сенсорів,» Праці Інституту електродинаміки Національної академії наук України, вип. 53, c. 80-89, 2019. https://doi.org/10.15407/publishing2019.53.080 .
L. K. Baxter, Capacitive Sensors: Design and Applications, New York: IEEE Press, 1997.
В. Ф. Пенской, А. Ю. Жуков, О. М. Мінко, і К.О. Кобзар, «Статор електричної машини,» Патент України на корисну модель № 66717, МПК H02K 1/16, 10.01.2012.
W. Jin, T. K. Y. Lee, S. L. Ho, H. L. Ho, K. T. Lau, L. M. Zhou, and Y. Zhou, “Structural strain and temperature measurements using fiber bragg grating sensors,” in Guided wave optical components and devices: basics, technology, and applications, Academic Press, pp. 389-400, 2006. https://doi.org/10.1016/B978-012088481-0/50026-7 .
А. C. Левицький, Є. О. Зайцев, і Н. Л. Сорокіна, «Розрахунок блока тарілчастих пружин у силовому акумуляторі стабілізації тиску пресування осердя статора потужного турбогенератора,» Праці Інституту електродинаміки Національної академії наук України, вип. 64, c. 81-86, 2023. https://doi.org/10.15407/publishing2023.64.081 .
Н. С. Ачеркана, Детали машин. Расчет и конструирование. М.: Машиностроение, 1968.
Guide to the measurement of force. London: The institute of measurement and control, 2013.
Э. Бауман, Измерение сил электрическими методами, М.: Мир, 1978.
А. С. Левицький, Є. О. Зайцев, і М. В. Панчик, «Виявлення дефектів складання осердя статора потужного турбогенератора,» Вісник Вінницького політехнічного інституту, № 3, с. 47-53, 2021. https://doi.org/10.31649/1997-9266-2021-156-3-47-53 .
I. Zaitsev, A. Levytskyi, M. Panchik, and V. Bereznychenko, “Fiber Bragg grating-based monitoring system for large generator core clamping fault diagnosis,” In modern electrical and energy system (MEES-2021). Conference Proceedings, 2021, pp. 1-4. https://doi.org/10.1109/MEES52427.2021.9598630 .
M. Kreuzer, Strain Measurement with fiber bragg grating sensors, 9 p. [Electronic resource]. Available: http://micronoptics.com/uploads/library/documents/FBGS_StrainMeasurement_mo.pdf .

Most read articles by the same author(s)