Methodology of overhead power transmission line pylons technical state assessment with typical exploitation faults accounted
Authors: Burnysheva T.V., Kozhevnikov A.N.
Published in issue: #2(110)/2021
DOI: 10.18698/2308-6033-2021-2-2053
Category: Mechanics | Chapter: Dynamics, Strength of Machines, Instruments, and Equipment
Structure safety estimation via the results of modal testing is widely used in building field. However, overhead power line pylons are so specialised that it is not possible to expand existing standards so that those could be employed to assess pylon conditions. These standards do not contain any information about the pylon eigenvalues, methodology of full-scaled experiment execution or criteria to differentiate pylons with respect to the extent of the structure defects occurred. This means that it is necessary to develop a dedicated approach to estimating the safety of this type of structures. The method proposed boasts an additional advantage, that is, it takes into account the operating defects that are typical for the type of structures under consideration. The point of this method is comparing the computed and experimentally determined natural frequencies of overhead power line pylons. This comparison enables us not only to detect the defect type present in the structure, but also to find whether it is located closer to the base of the structure or in the latticework on one of the sides. The paper presents the results of using our method for estimating the safety of intermediate towers for a 110 kV overhead power line as represented by the SV-5 segment and states the advantages of using our method when planning real-time inspection of structures, as well as for monitoring select towers constantly.
References
[1] Kozhevnikov A.N., Burnysheva T.V. Nauchno-tekhnicheskiy vestnik Povolzhya — Scientific and Technical Volga region Bulletin, 2020, no. 10, pp. 66–68.
[2] Levin V.E., Kozhevnikov A.N., Safonov O.N. Elektroenergiya. Peredacha i raspredelenie — Electric power. Transmission and distribution, 2017, no. 6 (45), pp. 68–72.
[3] Kozhevnikov A.N., Krasnorutskiy D.A., Levin V.E., Pustovoy N.V. The method of analyzing vibrations of air power transmission lines using reduced finite-element models of pylons and differential model of thin elastic rod system. 11th International forum on strategic technology (IFOST 2016): proc., Novosibirsk, 1–3 June 2016. Novosibirsk, NSTU, 2016, vol. 2, pp. 200–203. DOI: 10.1109/IFOST.2016.7884227
[4] Chen B., Guo W.H., Li P.Y., Xie W.P. The Scientific World Journal, 2014, vol. 2014. http://dx.doi.org/10.1155/2014/538457
[5] Jiang D., Fei Q., Zhou H., Han X. Study on dynamic properties of long-span power transmission tower-cable system. 14th International Workshop on Atmospheric Icing of Structures, 2011, vol. 14. Available at: https://www.compusult.com/html/IWAIS_Proceedings/IWAIS_2011/Papers/P2_33_214.pdf
[6] Smaznov D.N., Rodchikhin S.V., Moskalev A.V., Zimin K.N. Energiya edinoy seti — Energy of Unified Grid, 2017, no. 1 (30), pp. 38–45.
[7] Kozhevnikov A.N., Krasnorutskiy D.A., Levin V.E. Development of subroutine for automatic building of finite-element models of typical metal pylons of air power transmission lines. 2015 International Conference on Mechanical Engineering, Automation and Control Systems (MEACS). Tomsk, 2015, pp. 1–4. DOI: 10.1109/MEACS.2015.7414897
[8] Shen-En C., Kaoshan D. Shock and Vibration, 2010, vol. 17, no. 4–5, pp. 551–561. DOI: 10.3233/SAV-2010-0547
[9] Kravchenko A.Ya., Rodenko S.V., Safonov O.N., Snezhkov I.I., Chaplin I.V. Elektroenergiya. Peredacha i raspredelenie — Electric power. Transmission and distribution, 2018, no. 6 (51), pp. 126–131.
[10] GOST 34081—2017. Zdaniya i sooruzheniya. Opredelenie parametrov osnovnogo tona sobstvennykh kolebaniy [Buildings and constructions. Determination of parameters of the basic tone of natural oscillations]. Moscow, Standartinform Publ., 2017, 26 p.
[11] GOST 31937—2011. Zdaniya i sooruzheniya. Pravila obsledovaniya i monitoringa tekhnicheskogo sostoyaniya [Buildings and constructions. Rules of inspection and monitoring of the technical condition]. Moscow, Standartinform Publ., 2011, 95 p.