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스페이서 강성과 간격이 송전선 갤러핑에 미치는 영향분석
Effect Analysis of Spacer Stiffness and Interval on Galloping of Power Transmission Lines 원문보기

한국기계가공학회지 = Journal of the Korean Society of Manufacturing Process Engineers, v.18 no.1, 2019년, pp.52 - 58  

오윤지 (Graduate School of Mechanical Design Engineering, PKNU) ,  손정현 (Department of Mechanical Design Engineering, PKNU)

Abstract ▼ AI-Helper 아이콘AI-Helper

Due to icing and snow, power transmission lines have asymmetric cross sections, and their motion becomes unstable. At this time, the vibration caused by the wind is called galloping. If galloping is continuous, short circuits or ground faults may occur. It is possible to prevent galloping by install...

주제어

#송전선   #갤러핑   #공기력계수   #스페이서  

AI 본문요약
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제안 방법

  • The angle of attack at which galloping could occur was investigated by applying the aerodynamic coefficient obtained through the flow analysis to the Den Hartog Criterion, and galloping simulations of both Nos. 1 and 2 conductors were performed with regard to the angle of attack that caused instability in the transmission line.
  • The damping force inside the transmission line was modeled using free vibration experiments of transmission line and the Rayleigh damping coefficient to analyze the dynamic behavior of the transmission line.
  • The Rayleigh damping coefficient was also estimated using the amplitude ratio and the natural frequency, and the obtained results were applied to the transmission line modeling. The galloping generation conditions were identified through the flow analysis, and the wind load was modeled to perform galloping simulations.
  • The coordinate for transmission line modeling is defined in Figure 2. The transmission line was modeled using a number of lumped masses, springs, and dampers, and a transmission line with 500 m span was modeled with 31 mass elements and 32 springs and dampers with consideration of the accuracy of the real model and the analysis time. Since the movement with respect to angles θ and Ψ was relatively small compared to the sleet jump and galloping in Figure 2, a motion equation was not taken into consideration, and supporting points of the transmission line were assumed as fixed.
  • 48m, which was the design sag in a general region where the snowing period was less than one month, a deflection curve of the transmission line was obtained first. Then, the previously modeled damping and spring forces were applied to the transmission line model to carry out the static deflection analysis. The analysis results exhibited that the error rate was less than 1%, which verified the accuracy when comparing the theoretical deflection curve and lumped mass location of the transmission line model.
  • This study analyzed the effects of the stiffness of spring spacers located between bundled transmission line and installation spacing on galloping transmission line.
  • If a spacer is installed intensively in the support point, fatigue failures can be prevented. This study carry out galloping simulations according to the stiffness and installation interval by modeling a total of nine phase spacers at a 500 m span. In the simulations, these cases were considered with regard to the interval of the spacer: nine spacers installed at every 50 m distance, nine spacers installed at the center intensively, and nine spacers installed at the support point intensively.
  • This study modeled the transmission line with a number of lumped masses, springs, and dampers, and free vibration tests on the transmission line were conducted. The Rayleigh damping coefficient was also estimated using the amplitude ratio and the natural frequency, and the obtained results were applied to the transmission line modeling.
  • This study modeled transmission line using RecurDyn to analyze the galloping phenomenon dynamically. The coordinate for transmission line modeling is defined in Figure 2.

데이터처리

  • The damping force inside the transmission line was modeled using free vibration experiments of transmission line and the Rayleigh damping coefficient to analyze the dynamic behavior of the transmission line. In the free vibration test of transmission line, changes in the location of the end of the transmission line where deformation occurred because of the self-weight in the cantilever state were analyzed according to the transmission line length, and the Rayleigh damping coefficient was calculated using the amplitude ratio obtained through the free vibration test. The length of the actual transmission line is very long.
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참고문헌 (12)

  1. Koo, J. R. and Bae, Y. C., “Protection method of ice and snow failure at the power transmission line”, Proc. of the Korean Society for Noise and Vibration Engineering, Vol.2015, No.4, pp.735-738, 2015. 

  2. 10.1109/61.714515 Wang, J. and Lilien, J. L., “A new theory for torsinal stiffness of multi-span bundle overhead tranmission lines”, IEEE transactions on power delivery, Vol. 13, No. 4, pp.1405-1411, 1998. 

    상세보기 crossref

  3. 10.1109/CEIDP.2006.312093 Hu, J., Song, Z., Ma, J. and Wu, S., "Model for Comprehensive Simulation of Overhead High Voltage Power Transmission Line Galloping and Protection", Annual Report Conference on Electrical Insulation and Dielectric Phenomena, pp.190~193, 2006. 

    crossref

  4. Cho, J. U. and Han, M. S., “Study on the Vibration Analysis of Damper Clutch Spring”, Journal of the Korean Society of Manufacturing Process Engineers, Vol. 10, No. 4, pp22-30, 2011. 

  5. 10.14775/ksmpe.2016.15.3.122 Kim, Y. J., Ro, S. H., Shin, H. B., Shin, Jung, K. S., and Nam, K. D., “Effects of Design Alterations on the Vibration Suppression of a Machine Tool Structure”, Journal of the Korean Society of Manufacturing Process Engineers, Vol. 15, No. 3, pp122-129, 2016. 

    원문보기 상세보기 crossref

  6. 10.1109/T-AIEE.1930.5055685 Davison, A. E., “Dancing conductors”, Transactions of the American Institute of Electrical Engineers, Vol. 49, No. 4, pp.1444-pp.1449, 1930 

    상세보기 crossref

  7. 10.1109/T-AIEE.1932.5056223 Den Hartog, J. P., “Transmission Line Vibration Due to Sleet”, Transactions of the American Institute of Electrical Engineers, Vol. 51, No. 4, 1932. 

    상세보기 crossref

  8. 10.1007/s12206-018-0710-y Kim, J. W. and Sohn J. H., “Multibody dynamics study on galloping of power transmission line”, Journal of Mechanical Science and Technology, Vol. 32, No. 8, pp.3597-3602, 2018. 

    상세보기 crossref

  9. Kwak, M. K., Shin, J. H. and Koo, J. R., “Dynamic Modeling of Bundled transmission line and Vibration Experiment”, KSNVE fall conference, pp728-734, 2015. 

  10. Alipour, A. and Zareian, F., “Study Rayleigh damping in structures Unceratinities and treatments”, proceedings of 14th Word conference on Earthquake Engineering, Beijing, China, 2008. 

  11. Lilien, J. L., “State of the art of conductor galloping”, Technical Brochure CIGRE N° 322, Task Force B2.11.06, 2007. 

  12. 10.1061/(ASCE)EM.1943-7889.0000697 Nikitas, N. and Macdonald, J. H. G., “Misconceptions and Generalizations of the Den Hartog Galloping Criterion”, Journal ofEngineering Mechanics, Vol. 140, No. 4, 2013. 

    상세보기 crossref

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