Research on Windage Yaw Flashovers of Transmission Lines under Wind and Rain Conditions

Liqiang An, Yongyu Guan, Zhijian Zhu and Ronglun Zhang
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Liqiang An: Department of Mechanical Engineering, North China Electric Power University, Baoding 071003, China
Yongyu Guan: Department of Mechanical Engineering, North China Electric Power University, Baoding 071003, China
Zhijian Zhu: Department of Mechanical Engineering, North China Electric Power University, Baoding 071003, China
Ronglun Zhang: Hainan Electric Power Research Institute, Haikou 570100, China

Energies, 2019, vol. 12, issue 19, 1-18

Abstract: Windage yaw flashovers under strong wind and rain conditions leave a negative impact on the safe operation of transmission lines. However, the mechanism behind this is not well known yet. Therefore, this paper proposes a systematic method, including three basic parts described as simulation of wind and rain loads, calculation of windage yaw, and flashover analysis, to analyze windage yaw flashovers of transmission lines. The YanMeng-particle swarm optimization (YanMeng-PSO) algorithm is proposed to enhance the simulation accuracy. Unlike the conventional approach, the windage yaw status of conductors and insulator strings is dynamically described with key nodes and the breakdown voltage of their clearances rather than windage yaw angle. Furthermore, in the second part, a new method named key-node method (KNM) is proposed to calculate the conductors’ windage yaw. Moreover, the rain effect is also considered in this paper. This paper then presents a case study on a 110 kV double-circuit transmission line section that suffered severe collapse when the typhoon Rammasun landed in Hainan island. Particular focus was placed on the windage yaw flashover before the structural failure of the transmission line. The results validated the significant rain effect and found that conductors/ground suffer more severe windage yaw flashover than insulator strings. Finally, constructive solutions such as interphase spacers, reasonable conductor arrangement in the design phase, and regular measurements and adjustments of conductor sag in the maintenance phase are proposed to improve the design of transmission lines to enhance their capacity against windage yaw flashovers.

Keywords: transmission lines; windage yaw flashovers; rain effect; wind and rain loads; tower-line system; key-node method; YanMeng-PSO algorithm (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2019
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (1)

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