Monitoring of Excessive Deformation of Steel Structure Extra-High Voltage Pylons

Ličev, Lačezar; Hendrych, Jakub; Tomecek, Jan; Čajka, Radim; Krejsa, Martin

doi:10.3311/ppci.11253

Cited by 6 publications

(8 citation statements)

References 15 publications

(18 reference statements)

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“…Protecting these high-voltage pylons from geological hazards caused by mining disturbance is essential to ensure the normal operation of transmission wires along the route [8]. Unlike other surface buildings, such as industrial workshops or residential buildings, high-voltage pylons are columnar shaped, with relatively low bending stiffness, and their four bases are often independently arranged, with little force restraints between each of them [9,10]; therefore, when they are disturbed, high-voltage pylons may potentially not only settle as a whole, but may overturn or even become twisted because of their nonuniform ground surface subsidence or ground surface movement [10,11].…”

Section: Introductionmentioning

confidence: 99%

“…Energies 2022, 15, x 2 of 20 residential buildings, high-voltage pylons are columnar shaped, with relatively low bending stiffness, and their four bases are often independently arranged, with little force restraints between each of them [9,10]; therefore, when they are disturbed, high-voltage pylons may potentially not only settle as a whole, but may overturn or even become twisted because of their non-uniform ground surface subsidence or ground surface movement [10,11].…”

Section: Introductionmentioning

confidence: 99%

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Study on the Combined Mining Scheme for Coal Resources under High-Voltage Pylons and the Reinforcement for Pylons

Zhang

et al. 2022

Energies

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The increasing use of high-voltage transmission wires requires more and more high-voltage pylons, and sometimes, constructing pylons in mining areas is very urgent. To ensure the safe operation of pylons, coal pillars with large side lengths are usually used to provide sufficient support; however, this results in a huge waste of coal. Eight high-voltage pylons are arranged on the ground surface corresponding to the location of working face 1110 of Sima Coal Mine in Shanxi Province, China, which cannot be mined by traditional methods. Taking this as the engineering background, the failure mode of high-voltage pylon is first analyzed. Using FLAC3D numerical simulations, the influence of five different mining plans on ground surface deformation in working face 1110 is evaluated, and the vertical settlement and horizontal deformation in different areas of the ground surface, as well as the variation law of horizontal strain and slope are analyzed. According to the numerical simulation results, the range of thickness-limiting mining or backfill mining in working face 1110 is shown in scheme 3, and the key regions in the mining process are determined. Secondly, the strengthening scheme of high-voltage pylons is designed, that is, the four foundations of high-voltage pylons are connected as a whole with steel supports and steel connectors so as to improve the structural strength of the high-voltage pylon. Finally, the position change in the foundation of high-voltage pylons was monitored for 22 consecutive months. The results show that the maximum settlement of the high-voltage tower foundation is 3.1 m, which is consistent with the actual mining thickness; The high-voltage pylon was stably moved, and the change in transmission line tension and total length was usually less than 1.0%. The combined mining scheme and foundation strengthening scheme can ensure the safe operation of high-voltage pylons and provide a new method for the stability control of ground buildings in coal mining subsidence area.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Study on the Combined Mining Scheme for Coal Resources under High-Voltage Pylons and the Reinforcement for Pylons

Zhang

et al. 2022

Energies

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“…Periodic testing is performed by measuring deformation or the tower apex deviation. An interesting analysis of a high-voltage power line tower structure deformation is presented in [1]. The analysis concerned towers (pylons) with a height of 28-32.2 m supporting a double 110 kV power line.…”

Section: Introductionmentioning

confidence: 99%

Fiber Bragg Sensors on Strain Analysis of Power Transmission Lines

Juraszek

2020

Materials

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The reliability and safety of power transmission depends first and foremost on the state of the power grid, and mainly on the state of the high-voltage power line towers. The steel structures of existing power line supports (towers) have been in use for many years. Their in-service time, the variability in structural, thermal and environmental loads, the state of foundations (displacement and degradation), the corrosion of supporting structures and lack of technical documentation are essential factors that have an impact on the operating safety of the towers. The tower state assessment used to date, consisting of finding the deviation in the supporting structure apex, is insufficient because it omits the other necessary condition, the stress criterion, which is not to exceed allowable stress values. Moreover, in difficult terrain conditions the measurement of the tower deviation is very troublesome, and for this reason it is often not performed. This paper presents a stress-and-strain analysis of the legs of 110 kV power line truss towers with a height of 32 m. They have been in use for over 70 years and are located in especially difficult geotechnical conditions—one of them is in a gravel mine on an island surrounded by water and the other stands on a steep, wet slope. Purpose-designed fiber Bragg grating (FBG) sensors were proposed for strain measurements. Real values of stresses arising in the tower legs were observed and determined over a period of one year. Validation was also carried out based on geodetic measurements of the tower apex deviation, and a residual magnetic field (RMF) analysis was performed to assess the occurrence of cracks and stress concentration zones.

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“…The visual method is a better way to monitor the structure of iron towers. Deformation and structural state can be measured by images [12], especially with the application of robotic total station and unmanned aerial vehicles (UAVs) in the power industry, which provides a better platform for this method [13,14]. Reference [15] uses a point cloud model to implement viewpoint optimization, which can improve the accuracy of UAV monitoring.…”

Section: Introductionmentioning

confidence: 99%

A Vibration-Based Structural Health Monitoring System for Transmission Line Towers

et al. 2019

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In this paper, we present a vibration-based transmission tower structural health monitoring system consisting of two parts that identifies structural changes in towers. An accelerometer group realizes vibration response acquisition at different positions and reduces the risk of data loss by data compression technology. A solar cell provides the power supply. An analyser receives the data from the acceleration sensor group and calculates the transmission tower natural frequencies, and the change in the structure is determined based on natural frequencies. Then, the data are sent to the monitoring center. Furthermore, analysis of the vibration signal and the calculation method of natural frequencies are proposed. The response and natural frequencies of vibration at different wind speeds are analysed by time-domain signal, power spectral density (PSD), root mean square (RMS) and short-time Fouier transform (STFT). The natural frequency identification of the overall structure by the stochastic subspace identification (SSI) method reveals that the number of natural frequencies that can be calculated at different wind speeds is different, but the 2nd, 3rd and 4th natural frequencies can be excited. Finally, the system was tested on a 110 kV experimental transmission line. After 18 h of experimentation, the natural frequency of the overall structure of the transmission tower was determined before and after the tower leg was lifted. The results show that before and after the tower leg is lifted, the natural frequencies of each order exhibit obvious changes, and the differences in the average values can be used as the basis for judging the structural changes of the tower.

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Monitoring of Excessive Deformation of Steel Structure Extra-High Voltage Pylons

Cited by 6 publications

References 15 publications

Study on the Combined Mining Scheme for Coal Resources under High-Voltage Pylons and the Reinforcement for Pylons

Study on the Combined Mining Scheme for Coal Resources under High-Voltage Pylons and the Reinforcement for Pylons

Fiber Bragg Sensors on Strain Analysis of Power Transmission Lines

A Vibration-Based Structural Health Monitoring System for Transmission Line Towers

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