Flashover Performance Test with Lightning Impulse and Simulation Analysis of Different Insulators in a 110 kV Double-Circuit Transmission Tower

Yaqi Zhang, Licheng Li, Yongxia Han, Yaoxuan Ruan, Jie Yang, Hansheng Cai, Gang Liu, Yi Zhang, Lei Jia and Yutang Ma
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Yaqi Zhang: School of Electric Power, South China University of Technology, Guangzhou 510640, China
Licheng Li: School of Electric Power, South China University of Technology, Guangzhou 510640, China
Yongxia Han: School of Electric Power, South China University of Technology, Guangzhou 510640, China
Yaoxuan Ruan: School of Electric Power, South China University of Technology, Guangzhou 510640, China
Jie Yang: School of Electric Power, South China University of Technology, Guangzhou 510640, China
Hansheng Cai: Electric Power Research Institute, China Southern Power Grid, Guangzhou 510080, China
Gang Liu: Electric Power Research Institute, China Southern Power Grid, Guangzhou 510080, China
Yi Zhang: Electric Power Research Institute, China Southern Power Grid, Guangzhou 510080, China
Lei Jia: Electric Power Research Institute, China Southern Power Grid, Guangzhou 510080, China
Yutang Ma: Electric Power Science Research Institute of Yunnan Power Supply Company, Kunming 650217, China

Energies, 2018, vol. 11, issue 3, 1-13

Abstract: The flashover performance of insulators is the foundation of the calculation of precise lightning protection. The material and structure of an insulator affect its flashover performance but the research on the differences in the flashover performance of different insulators and the analysis of the reason for these differences have not been clear. In this paper, lightning impulse flashover tests of two types of insulators (composite and glass insulators) were carried out in the National Engineering Laboratory (Kunming) for Ultrahigh-voltage Engineering Technology. In these tests, the insulators were hung in a 110 kV double-circuit transmission tower and a standard lightning impulse (1.2/50 ?s) was applied to the insulators. The discharge path and the 50% impulse flashover voltage of the insulators were recorded. At the same time, the electric fields in the vicinity of different insulators were calculated using the finite element method with COMSOL Multiphysics. The electric field distribution and the uneven coefficient were analyzed. Combined with the flashover test data and the electric field simulation, the relationship between the flashover performance (discharge path and 50% impulse flashover voltage) and the electric field (electric field distribution and uneven coefficient) is found. The simulation results are in accordance with the test data and the conclusions can provide useful references for the external insulation design of transmission lines and the optimization of insulators.

Keywords: composite and glass insulators; standard lightning impulse; flashover performance; electric field; finite-element method; 110 kV double-circuit transmission line (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: 2018
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (4)

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