Investigation of Lateral Vibrations in Turbine-generator Unit 5 of the Inga 2 Hydroelectric Power Plant

André Mampuya Nzita; Edmond Phuku Phuati; Robert Muanda Ngimbi; Guyh Dituba Ngoma; Nathanaël Masiala Mavungu

doi:10.61927/igmin173

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Engineering Group Research Article Article ID: igmin173

Investigation of Lateral Vibrations in Turbine-generator Unit 5 of the Inga 2 Hydroelectric Power Plant

Energy Systems

André Mampuya Nzita ^* ¹ ,

Edmond Phuku Phuati ² ,

Robert Muanda Ngimbi ² ,

Guyh Dituba Ngoma ³ and

Nathanaël Masiala Mavungu ¹

Affiliation

President Joseph Kasa-Vubu University, Department of Electromechanical Engineering, Polytechnic Faculty, Boma, Kongo Central, DR Congo

University of Kinshasa, Department of Physics, Faculty of Science and Technology, Kinshasa, DR Congo

University of Quebec in Abitibi-Témiscamingue, School of Engineering, Rouyn-Noranda, Canada

President Joseph Kasa-Vubu University, Department of Electromechanical Engineering, Polytechnic Faculty, Boma, Kongo Central, DR Congo

DOI10.61927/igmin173 Fulltext HTML Fulltext PDF Cite this Article

Abstract

The article presents a case study on the Investigation of lateral vibrations in the turbine-generator unit 5 of the Inga 2 hydroelectric power plant in the Democratic Republic of the Congo. Lateral vibrations were experimentally determined using twelve proximity and eddy-current probes, positioned on each measurement plane. The results were analyzed using the Dasylab and R software. Hence, it was observed that the vibration amplitudes of the upper guide bearing, lower guide bearing, and pivot/rotor exceeded acceptable or critical limit values of the international vibration standard for a rotating speed between 100-250 rpm. These excesses can lead to rotor mass imbalances, the eccentricity of the rotor axis relative to the rotation axis of the shaft, and the deformation of the coupling shaft between the upper rotor shaft and the turbine rotor shaft. Subsequently, the means and the variances of the vibration amplitudes were evaluated and compared to the reference values of the international standard. The results of the compliance analysis revealed statistically significant differences between the measured amplitudes and the reference values. Thus, it indicates deviations from international specifications.

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References

Yan ZG, Cui T, Zhou LT, Zhi FL, Wang ZW. Study on safety operation for large hydroelectric generator unit. IOP conference series: earth and environmental science. 2022; 15:2-4, discussion 3-4. DOI: 10.1088/1755-1315/15/2/02202.
Saravanja D, Grbesic M. Vibration testing for assessing the hydro unit condition in different operating modes, Proceedings of the 31^st DAAAM international symposium. Published by DAAAM international. Vienne, Austria: 2020; 19-26, discussion 25. DOI: 10.2507/31st.daaam.proceedings.003.
Bawa MA, Tokan A, Salisu I. Investigation of frequent failure of Francis-hydraulic turbine guide-vane shear pin of shiroro hydro-electric power station. International journal of research publications, 2020; 57(1):44-46. DOI:10.47199/JRP100571720201326.
Shen A, Chen Y, Zhou J, Yang F, Hongliang S, Cai F. Hydraulic vibration and possible exciting sources analysis in a hydropower system. Applied science. 2021; 11: 5529-3. DOI: https://doi.org/10.3390/app11125529.
Bucur DM, Dunca G, Calinoiu C. Experimental vibration level analysis a Francis turbine. IOP conference series: earth and environmental science. 2012; 15:1-10. DOI: 10.1088/1315/15/6/062056.
Huang R, An J, Luo X, Ji B, Xu HY. Numerical simulation of pressure vibrations in a Francis turbine draft tube with air admission. Conference paper. 2014 August; 2-5. DOI: 10.1115/FEDSM2014-21444.
Zhou J, Chen Y. Discussion on stochastic analysis of hydraulic vibration in pressurized water diversion and hydropower systems. Water. 2018; 10:353-6. DOI:10.3390/w10040353.
Kim JW, Kwak WI, Choe BS, Kim HH, Suh SH, Lee YB. The rotordynamic analysis of the vibration considering the hydro-electric force supported by rolling elements in 500kW Francis turbine. Journal of mechanical science and technology. 2017; 31(11):5154-5159. DOI: 10,1007/sl2206-017-1009-0.
Lai XD, Liao GL, Zhu Y, Zhang X, Gou QQ, Zhang WB. Lateral vibration of hydro turbine-generator rotor with varying stiffness of guide bearings.IOP conference series: earth and environmental science. 2012; 15:1-15. DOI: 10.1088/1755-1315/15/4/042006.
Mohanta RS, Chelliah TR, Allamsetty S, Akula A, Ghosh R. Sources of vibration and their treatment in hydropower stations-a review. Engineering Science and Technology, an international journal. 2016; 1-10. DOI: http://dx.doi.org/10.1016/j.jestch.2016.11.004
Revue ACEC. The Inga II hydroelectric power plant. 1983; 1-32.
Zloto T, Pawel P, Prauzner T. Analysis of signals from inductive sensors by means of the Dasylab software. Anales UMCS informatica AX XII. 2012, 1:31-37. DOI:10.2478/v10065-0005-3.
Ovadia-Blechman Z, Einav S, Zaretsky U, Castel D, Toledo E, Eldar M. The area of the pressure-flow loop for assessment of arterial stenosis: a new index. Technol Health Care. 2002;10(1):39-56. PMID: 11847447.
Lafaya de Micheaux P, Drouilhet R, Liquet B. Software R: mastering the language of (bio) statistical analysis. Springer. 2014; 2: 1-578.
Bofoya K. Statistics for economists, course and solved exercises. Kinshasa : 2010; 108-199
Consortium Siemens-Neyrpic. Commissioning report of turbine-generator unit 5. 1983; 2.2.

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[1] Yan ZG, Cui T, Zhou LT, Zhi FL, Wang ZW. Study on safety operation for large hydroelectric generator unit. IOP conference series: earth and environmental science. 2022; 15:2-4, discussion 3-4. DOI: 10.1088/1755-1315/15/2/02202.

[2] Saravanja D, Grbesic M. Vibration testing for assessing the hydro unit condition in different operating modes, Proceedings of the 31^st DAAAM international symposium. Published by DAAAM international. Vienne, Austria: 2020; 19-26, discussion 25. DOI: 10.2507/31st.daaam.proceedings.003.

[3] Bawa MA, Tokan A, Salisu I. Investigation of frequent failure of Francis-hydraulic turbine guide-vane shear pin of shiroro hydro-electric power station. International journal of research publications, 2020; 57(1):44-46. DOI:10.47199/JRP100571720201326.

[4] Shen A, Chen Y, Zhou J, Yang F, Hongliang S, Cai F. Hydraulic vibration and possible exciting sources analysis in a hydropower system. Applied science. 2021; 11: 5529-3. DOI: https://doi.org/10.3390/app11125529.

[5] Bucur DM, Dunca G, Calinoiu C. Experimental vibration level analysis a Francis turbine. IOP conference series: earth and environmental science. 2012; 15:1-10. DOI: 10.1088/1315/15/6/062056.

[6] Huang R, An J, Luo X, Ji B, Xu HY. Numerical simulation of pressure vibrations in a Francis turbine draft tube with air admission. Conference paper. 2014 August; 2-5. DOI: 10.1115/FEDSM2014-21444.

[7] Zhou J, Chen Y. Discussion on stochastic analysis of hydraulic vibration in pressurized water diversion and hydropower systems. Water. 2018; 10:353-6. DOI:10.3390/w10040353.

[8] Kim JW, Kwak WI, Choe BS, Kim HH, Suh SH, Lee YB. The rotordynamic analysis of the vibration considering the hydro-electric force supported by rolling elements in 500kW Francis turbine. Journal of mechanical science and technology. 2017; 31(11):5154-5159. DOI: 10,1007/sl2206-017-1009-0.

[9] Lai XD, Liao GL, Zhu Y, Zhang X, Gou QQ, Zhang WB. Lateral vibration of hydro turbine-generator rotor with varying stiffness of guide bearings.IOP conference series: earth and environmental science. 2012; 15:1-15. DOI: 10.1088/1755-1315/15/4/042006.

[10] Mohanta RS, Chelliah TR, Allamsetty S, Akula A, Ghosh R. Sources of vibration and their treatment in hydropower stations-a review. Engineering Science and Technology, an international journal. 2016; 1-10. DOI: http://dx.doi.org/10.1016/j.jestch.2016.11.004

[11] Revue ACEC. The Inga II hydroelectric power plant. 1983; 1-32.

[12] Zloto T, Pawel P, Prauzner T. Analysis of signals from inductive sensors by means of the Dasylab software. Anales UMCS informatica AX XII. 2012, 1:31-37. DOI:10.2478/v10065-0005-3.

[13] Ovadia-Blechman Z, Einav S, Zaretsky U, Castel D, Toledo E, Eldar M. The area of the pressure-flow loop for assessment of arterial stenosis: a new index. Technol Health Care. 2002;10(1):39-56. PMID: 11847447.

[14] Lafaya de Micheaux P, Drouilhet R, Liquet B. Software R: mastering the language of (bio) statistical analysis. Springer. 2014; 2: 1-578.

[15] Bofoya K. Statistics for economists, course and solved exercises. Kinshasa : 2010; 108-199

[16] Consortium Siemens-Neyrpic. Commissioning report of turbine-generator unit 5. 1983; 2.2.

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