The Way of Reducing Current Values in Optical Ground Wires at Asymmetrical Faults on Overhead Transmission Lines
DOI:
https://doi.org/10.1515/ecce-2016-0007Keywords:
Fault currents, Grounding, Transmission linesAbstract
Given the fact that the installing costs of an optical ground wire on overhead lines directly depend on its cross-section, which in turn depends on the level of fault current it should withstand, in order to reduce these current values in the optical ground wire, I suggested performing its isolated descents from the end towers of the line with its transition to an optical cable. The research was carried out on the example of a 500 kV overhead line in the National Electric Power Grid. The Method of Symmetrical Components for calculating asymmetrical fault currents was not used; therefore, calculations were carried out on the base of presenting the line as a multi-wire system for the considered case as a five-wire system (optical ground wire, steel ground wire, and three phase wires). Such approach allows taking into account the initial asymmetry of the line parameters and modeling any kind of asymmetrical faults. The analyses of calculated results were performed. The conclusive evidence that the optical ground wire isolated descents from the end towers of the line give the possibility of reducing the level of maximal fault current distribution values in it and therefore its cross section, is presented.References
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R. Sitdikov and G. Egamnazarov, “The etalon model for solving currents in ground wires at asymmetrical short circuits on overhead power transmission lines,” Elektrofenergetika, Kosice, vol. 9, no. 1, Feb. 2016. [Online]. Available: http://jeen.fei.tuke.sk/index.php/jeen/
T. Thanasaksiri, “Analysis of Overhead Ground Wire Sizes in Distribution Systems,” in Proc. 6th Int. Conf. on Electrical Eng./Electronics, Computer, Telecommun. and Information Technology, ECTI-CON 2009, May 6–9, 2009, vol. 1, pp. 92–95. https://doi.org/10.1109/ECTICON.2009.5136973
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IEEE Guide for Protective Relay Applications to Transmission Lines, C37.113-1999, Feb. 29, 2000. https://doi.org/10.1109/IEEESTD.2000.91147
C. A. Crisafulli and D. J. Spoor, “A Case Study on the Appropriate Selection of Optical Ground Wire,” in 2008 Australasian Universities Power Engineering Conference (AUPEC'08), Sydney, 2008.
L. L. Henriksen, J. T. Leman and B. H. Berkebile, “Current Rating of Optical Ground Wires,” Power Engineers, Inc., Line Conference, March 2008. pp. 1–12. [Online]. Available: https://www.powereng.com (March 2008)
G.-X. Xu, “Single-phase earth fault current distribution between optical fiber composite overhead ground wire and ordinary ground wire in transmission system,” J. Chongqing Univ. (Eng. Ed.), vol. 10 no 1. pp. 78–83, 2011.
IEEE Recommended Practice for Calculating Short-Circuit Currents in Industrial and Commercial Power Systems, 551-2006, Nov. 17, 2006. https://doi.org/10.1109/IEEESTD.2006.248693
G. Egamnazarov, “Calculating the currents in shield wires at short circuits in overhead power transmission lines,” Electroenergetica 2013, Stara Lesna, Slovak Republic, pp. 474–475, 2013.
G. Egamnazarov, “The approach for calculation of asymmetrical modes in multi-wire overhead power transmission lines,” in Int. scientific conf., UNITECH-13, Gabrovo, Nov. 22–23, 2013. [Online]. Available: unitech.tugab.bg
J. R. Carson, “Wave Propagation in Overhead Wires with Ground Return,” Bell System Technical Journal, vol. 5, issue 4, pp. 539–554, Oct. 1926. https://doi.org/10.1002/j.1538-7305.1926.tb00122.x
J. D. Glover, M. S. Sarma and T. J. Overbye, Power System analysis and design, 5th ed., Stamford, USA: Cengage Learning, 2010.
IEEE Guide to Grounding During the Installation of Overhead Transmission Line Conductors—Supplement to IEEE Guide to the Installation of Overhead Transmission Line Conductors, 524a-1993, July 13, 1994. https://doi.org/10.1109/ieeestd.1994.121457
L. L. Grigsby and A. P. Hanson, “Power Flow Analysis,” in Power Systems (Electric Power Engineering Series), L. L. Grigsby (Eds.), 3rd ed., New York: Taylor & Francis Group, LLC, 2012, ch. 3, pp. 51–61. https://doi.org/10.1201/b12111-5
R. Sitdikov and G. Egamnazarov, “The etalon model for solving currents in ground wires at asymmetrical short circuits on overhead power transmission lines,” Elektrofenergetika, Kosice, vol. 9, no. 1, Feb. 2016. [Online]. Available: http://jeen.fei.tuke.sk/index.php/jeen/
T. Thanasaksiri, “Analysis of Overhead Ground Wire Sizes in Distribution Systems,” in Proc. 6th Int. Conf. on Electrical Eng./Electronics, Computer, Telecommun. and Information Technology, ECTI-CON 2009, May 6–9, 2009, vol. 1, pp. 92–95. https://doi.org/10.1109/ECTICON.2009.5136973
L. Jie, L. Gang and C. Xi, “Study on the thermal stability of OPGW Under Large Current Condition,” in Proc. Pacific-Asia Conf. on Circuits, Communications and System. PACCS 2009, Chengdu, China, May 16–17, 2009, pp. 629–635. https://doi.org/10.1109/PACCS.2009.103
IEEE Guide for Protective Relay Applications to Transmission Lines, C37.113-1999, Feb. 29, 2000. https://doi.org/10.1109/IEEESTD.2000.91147
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2016-12-01
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Copyright (c) 2016 Georgiy Egamnazarov (Author)
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Egamnazarov, G. (2016). The Way of Reducing Current Values in Optical Ground Wires at Asymmetrical Faults on Overhead Transmission Lines. Electrical, Control and Communication Engineering, 11(1), 13-20. https://doi.org/10.1515/ecce-2016-0007
