Dynamic Capacity Analysis of Overhead Transmission Lines Considering Temperature Field
In order to improve the transmission capacity and the dynamic capacity increase of transmission line, the radial temperature rise phenomenon of transmission line is studied and analyzed. In this paper, the overhead transmission line is taken as an example. Firstly, the theoretical value of the conductor temperature is calculated based on the heat balance equation. Then, the electromagnetic coupling finite element stranding model of the transmission line temperature field is established to calculate the radial temperature distribution of the transmission line and study the influence of different factors on it. Finally, the effect of dynamic capacity expansion of the transmission line is analyzed based on the analysis results of the temperature field, and the minimum current carrying capacity is calculated according to the temperature distribution of the conductor. The results show that the radial temperature distribution of the transmission line is not uniform. The internal temperature is high and the surface temperature is low; the temperature of the transmission line is affected by different current, wind speed, ambient temperature and time. The radial temperature difference can generally reach 0.58~4.53℃, so the radial temperature difference of the overhead conductor is studied. According to the temperature distribution of the wire, the minimum current carrying capacity is calculated, which is beneficial to improve the dynamic capacity of the transmission line so as to ensure the safe operation of the line.
Keywords: transmission lines, temperature field, dynamic capacity, finite element analysis
ZHAO C Y, ZHENG L H, TIAN C G, et al. Numerical calculation on conductor temperature field of 66 kV overhead transmission lines [J]. Jilin Electric Power, 2007, 35(5)：5—8.(In Chinese)
DU Y X, LU X L, NIE Y Y. Research on dynamic response of layer shedding in line system [J]. Journal of Hunan University (Natural Sciences), 2017, 44(7)：109—115. (In Chinese)
HE Q, LI J H, ZHANG J, et al. Numerical analysis and experiment of icing condition of bundled conductors [J]. Journal of Central South University (Science and Technology), 2019, 50(6)：1485— 1491.( In Chinese)
LIU G, LI Y, QI K, et al. Sag calculation difference caused by temperature difference between the steel core and outer surface of overhead transmission lines [C]// 2016 Australasian Universities Power Engineering Conference (AUPEC). Brisbane, Australia： IEEE, 2016：1—5.
ZEICZAK M. Approximate relationships for calculation of current- carrying capacity of overhead power transmission lines in different weather conditions [C]// 2017 Progress in Applied Electrical Engineering(PAEE). Koscielisko, Poland：IEEE, 2017：1—5.
ZHAO Z. Researches on risk calculation for dynamic capacity increase of overhead lines [D]. Nanjing：College of Automation, Nanjing University of Science And Technology, 2017：21—36. (In Chinese)
IEC 1597—1995 Overhead electrical conductors -Calculation methods for stranded bare conductors [S]. Suisse：Bureau Central de la Commission Electrotechnique Internationale, 1995：1—85.
IEEE 738—1993 IEEE Standard for calculating the current - temperature relationship of bare overhead conductors [S]. New York：The Institute of Electrical and Electronics Engineers, Inc, 1993:1—56.
LIN Y Z. The calculation of current carrying capacity and temperature of high voltage overhead lines [J]. Southern Power System Technology, 2012, 6(4)：23—27. (In Chinese)
GB 50545—2010 code of design of 110 kV ~750 kV overhead transmission line[S]. Beijing：China Planning Press, 2010：15—23. (In Chinese)
XIAO K, LIU Y D, LI P Y. Numerical simulation of radial temperature field of overhead conductors [J]. Journal of Wuhan University of Technology, 2015, 37(4)：65—70. (In Chinese)
SU C, WU X M, XIE H B. Calculation of temperature and maximum allowable load flow of overhead transmission lines [J]. NingXia Electric Power, 2016(6)：1—6, 13. (In Chinese)
ZHANG S L. ERM simulation on heterogeneous temperature field of transmission lines[J]. Journal of Electric Power, 2018, 33(6)：64— 72.(In Chinese)
LIU G, LI Y, CHEN Y, et al. Calculation and experimental verification of temperature distribution and radial temperature of overhead transmission line based on electromagnetic -thermal coupling fields [J]. Power System Protection and Control, 2018, 46 (7)：7—13.(In Chinese)
HAN X Y. Brief analysis of application and status quo of compatibilization technology in power grid system [J]. Auto Time, 2018(10)：188—189. (In Chinese)
ZHANG Q P, QIAN Z Y. Study on real -time dynamic capacity- increase of transmission line [J]. Power System Technology, 2005, 29(19)：18—21. (In Chinese)
YAN Y X, ZHU T, WANG L, et al. Design and application of new type dynamic capacity enlargement system for transmission cable [J]. Proceedings of the CSU-EPSA, 2018, 30(8)：133—139.(In Chinese)
GAO Q. Numerical simulation and analysis of temperature field of overhead conductors [D]. Beijing：School of Engergy Power and Machanical Engineering, North China Electric Power University, 2017：33—34. (In Chinese)
XU J K. Enhanced heat transfer effect and fatigue life analysis of overhead conductor under Aeolian vibration [D]. Zhengzhou： College of Civil Engineering, Zhengzhou University, 2019：89—95. (In Chinese)
GE D F. Electrical engineering electrical design handbook[M]. Beijing：China Electric Power Press, 1989：20—27.(In Chinese)
HUANG X B, CUI Y T, ZHU Y C, et al. Analysis of the surface convective heat transfer coefficient of icicle on transmission lines [J]. High Voltage Engineering, 2019, 45(6)：1975—1981.(In Chinese)
GB 1179—2008 round wire concentric stranded overhead conductor [S]. Beijing：Standards Press of China, 2008：1—40.(In Chinese)
LIU H J, ZHOU J L, ZHAO Y X. Analysis on dynamic effect of transmission line system based on wire breakage [J]. Journal of Hunan University (Natural Sciences), 2018, 45 (3)：62—71.(In Chinese)
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