SHEAR RESISTANT METHOD AND DEVICE FOR MONITORING THE HEART OF A STATOR TURBOGENERATOR DURING THE OPERATION PROCESS
DOI:
https://doi.org/10.15588/1607-6761-2019-1-3Keywords:
turbogenerator, end zone, stator winding, pressing, strain gaugeAbstract
Purpose. The aim of the work is to create a new method and device for monitoring the integrity of the coupling prisms, which will allow, with minor improvements in the design of individual measuring prisms, to obtain information on the state (damage) of all the coupling prisms and, therefore, on the degree of pressing of the stator iron as a whole.
Methodology. The tensometric method of physical modeling, analytical calculations.
Findings. An experimental model of a device for monitoring and diagnosing the state of pressing of a generator stator core was developed and investigated on a physical model of a 500 MW turbogenerator.
The advantage of the control method with the use of sensors based on strain gauges is determined by the relatively low cost of the latter, and with the right choice of elastic element and design, it is possible to monitor the mounting elements of the stator core with a fairly high degree of accuracy.
The tests carried out with the simulation of the destruction of prisms by removing from them the load on the models of the stator of the turbogenerator in laboratory conditions showed a satisfactory agreement between the results of the experiment and theoretical calculations. The data on the change in the stress-strain state of the rods of the model were evaluated using strain gauges pasted in a certain way on the measuring stud.
The main advantage of the proposed method of controlling forces in the clamping prism is the fact that measurements can be made on a stopped turbogenerator without removing the end shields, since the forces in the clamping prisms, taking into account their changes, in the event of damage to any prism remain inoperative.
The introduction of the developed method and device will not only prevent emergencies associated with the breakage of the coupling prisms, but also provide an opportunity to exercise constant monitoring of the state of pressing of the stator core.
Originality. A new method for controlling the state of coupling prisms of the stator core without removing the side panels of the turbogenerator is proposed, and for the first time theoretically substantiated the possibility of using a mathematical apparatus to determine the location of damage and the number of prisms with loosened nuts or broken threads.
Practical value. On the basis of fundamental results, a method for monitoring and diagnosing the state of pressing the stator core of a turbogenerator using special measuring studs has been developed. The proposed method will make it possible to determine the number of prisms that are damaged, and, therefore, to predict the timing of the subsequent repair without the output of the generator to be repaired, according to the readings of the sensors.
References
Shidlovs'kij A.K. (2003) Rozvitok palivno-energetichnogo kompleksu shljahom jogo modernіzacії [Development of the fuel and energy complex through its modernization]. Materіali naukovo-praktichnoї konferencії «Utverdzhennja іnnovacіjnoї modelі rozvitku ekonomіki Ukraїni» [Proc. of the Int. Conf. " Approval of an innovative model for the development of the Ukrainian economy ".], 121–131. (in Ukrainian.)
Kuchinskij K.A. (2016) Termonaprjazhennoe sostojanie izoljacii obmotki statora turbogeneratora pri razlichnyh variantah ee kreplenija v torcevoj zone serdechnika. [Thermally stressed state of insulation of the stator winding of the turbogenerator with different variants of its mounting in the end zone of the core.]. Praci In-tu elektrodynamiky NAN Ukrai'ny, 43, 65-70.
Kuchynskyi K., Titko V., Hutorova M., Mystetskyi V., Khudyakov A., Prus V. (2017) Mathematical model and research results of vibromechanical processes in the elements of the powerful synchronous generator end area. Proc. International Conference on Modern Electrical and Energy Systems MEES’17, 308–311.
Vas'kovskyj Ju.N., Kovalenko M.A. (2012) Yssledovanye y optymyzacyja ustrojstva dyagnostyky defektov obmotky rotora korotkozamknutogo asynhronnogo эlektrodvygatelja [Research and optimization of the device for diagnosing defects in the winding of a rotor of a short-circuited asynchronous electric motor]. Elektrotehnika i elektroenergetyka, 2, 12-17.
Kobozev A. S., Sereda A. G., Zhornjak L. B., Morgun V. V. (2012) Modernizacija zashhity jelektroustanovok sobstvennyh nuzhd AJeS naprjazheniem 0,4 kv [Modernization of protection of electrical installations of own needs of NPPs with a voltage of 0.4 kV]. Elektrotehnika i elektroenergetyka, 2, 66-72.
Butov A.V., Mamikonjanc L.G., Pikul'skij V.A. (2001) Povrezhdaemost' i kontrol' zubcovyh zon zapechennyh krajnih paketov stali serdechnikov statorov turbogeneratorov [Damage and control of the tooth zones of the baked outer packets of steel cores of stators of turbogenerators]. Jelektricheskie stancii, 5, 41-47.
Zdanovs'kyj V.G., Fedorenko G.M. (2001) Dosvid ekspluatacii' turbo-generatoriv typu TGV z vycherpanym resursom na ukrai'ns'kyh TES [Experience of operation of turbogenerators of the type DVB with exhausted resource at Ukrainian TPPs]. Novyny energetyky, 9, 67-63.
Alekseev B.A. (2001) Opredelenie sostojanija (diagnostika) krupnyh turbogeneratorov [Determination of the state (diagnostics) of large turbine generators]. Moscow, NTs ENAS Publ., 152.
Zozulіn Ju.V. (2011)Stvorennja novih tipіv ta modernіzacіja dіjuchih turbogeneratorіv dlja teplovih elektrichnih stancіj [Creation of new types and modernization of existing turbine generators for thermal electric power stations]. Harkiv, PF « Kolegіum » Publ., 228.
Golodnova O.S., Rostik G.V. (2004) O prichinah povrezhdenij torcevyh zon serdechnikov statorov turbogeneratorov i merah po ih preduprezhdeniju [On the causes of damage to the end zones of the stator cores of the turbogenerator-tori and measures to prevent them]. St. Petersburg, Sbornik «Elektrosila», 43, 56-64.
Kuznecov D.V., Maslov V.V., Pikul'skij V.A. (2004) Defekty turbogeneratorov i metody ih diagnostiki na nachal'noj stadii pojavlenija [Defects of turbogenerators and methods of their diagnostics at the initial stage of appearance]. Jelektricheskie stancii, 4, 51-57.
Firsanov E. P. (2011) Issledovanie termomehanicheskih processov v odnomernoj sisteme prjamolinejnyh mehanicheski svjazannyh sterzhnej [Investigation of thermomechanical processes in a one-dimensional system of rectilinear mechanically connected rods]. – Access mode: http://www/sciteclibrary.ru/rus/catalog/pages/11226.html
Nazolin, A.L. (2013) Obnaruzhenie defektov mashin i mehanizmov ciklicheskogo dejstvija po vremennym i vibroakusticheskim parametram [Detection of defects of machines and mechanisms of cyclic action on time and vibroacoustic parameters]. avtoref. dis. na poluchenie nauchn. stepeni dokt. tehn. nauk : 01.02.06, 32.
Cook J. A., Allen D.T. Method and apparatus for measuring compression in a stator core. Patent U.S. no. 7946023, 2011.
Nico Anthonie Dral, Matheus Theodoor Hendrik Marie Van Kortenhof Device and method for tightening a nut placed on a threaded end, and assembled washer and nut for such a device. Patent U.S. no. 8156820, 2010.
Levyc'kyj A. S., Zajcev Je. O., Kobzar K. O. (2017) Volokonno-optychni vymirjuvachi zusyl' v stjazhnyh pryzmah turbogeneratoriv na osnovi reshitok Bregga [Fiber Optic Measuring Factors in Brazing Pins of Turbogenerators Based on Bragg Grates]. Gidroenergetyka Ukrai'ny, 3-4, 22-25.
Levytskyi A.S., Zaitsev Ye. O., Smyrnova A.M. (2018) Pruzhnyj element peretvorjuvacha zusyl' v stjazhnyh pryzmah oserdja statora potuzhnogo turbogeneratora [Elastic element of the power transformer in the coupling prisms of the stator core of a powerful turbogenerator]. Pr. In-tu elektrodynamiky NANU, 49, 32-39.
Osternik, Je. S. (2009) Modelirovanie i analiz pogreshnostej shem pri issledovanii naprjazhenij v moshhnyh jelektromashinah [Modeling and analysis of circuit errors in the study of voltages in high-power electric machines]. Vestnik NTU "HPI", 42, 66-73.
Fedorenko G.M., But A.A., Kuz'min V.V. (1991) Metodika i izmeritel'nye sredstva opredelenija usilij pressovki v serdechnike statora moshhnogo turbogeneratora [Technique and measuring tools for determining the pressing forces in the stator core of a powerful turbo-generator]. Tehn. jelektrodinamika, 4, 64-69.
A.S. Levic'kij, G.M. Fedorenko, O.P. Gruboj (2011) Kontrol' stanu potuzhnih gіdro- ta turbogeneratorіv za dopomogoju єmnіsnih vimіrjuvachіv parametrіv mehanіchnih defektіv [Control of the state of powerful hydro and turbogenerators by means of capacitive measuring instruments of mechanical defects parameters]. In-t jelektrodinamiki NAN Ukrainy, 242.
Pat. US9,016,991 B2. Int. Cl. F16B 31/02, H02 K1/16, H02 K11/00, 3P 19/06, G01L 1/24, G01L 5/24, G01 D 5/353. Bolt tightener device for tightening a through-bolt in a generator core / Twerdochlib Michael (US), Edward David (US), Diatzikis Evangelos V. (US); Assignee Siemens Energy, Inc. (Orlando, FL, US) – Appl. No. 13/863,473; Date of Patent 28.04.2015.
Pat. US 20120026482 A1. Int. Cl. G01J5/48. Use of fiber optic sensor techniques for monitoring and diagnostics of large AC generators / George Franklin Dailey (US) – Appl. No. US 13/065,842; Date of Patent 02.02. 2012.
Downloads
Published
How to Cite
Issue
Section
License
Copyright (c) 2019 K.A. Kuchynskyi, V.A. Titko, V.A. Kramarsky, M.S. Hutorova
This work is licensed under a Creative Commons Attribution 4.0 International License.
Creative Commons Licensing Notifications in the Copyright Notices
Authors who publish with this journal agree to the following terms:
Authors retain copyright and grant the journal right of first publication with the work simultaneously licensed under aCreative Commons Attribution License that allows others to share the work with an acknowledgement of the work's authorship and initial publication in this journal.
Authors are able to enter into separate, additional contractual arrangements for the non-exclusive distribution of the journal's published version of the work (e.g., post it to an institutional repository or publish it in a book), with an acknowledgement of its initial publication in this journal.
Authors are permitted and encouraged to post their work online (e.g., in institutional repositories or on their website) prior to and during the submission process, as it can lead to productive exchanges, as well as earlier and greater citation of published work.
