Simulation Study on the Electric Field of Three-Phase Three-Post Insulators Under Typical Defects

Zhuoran Yang, Lixiang Lv, Hao Wang, Yue Wang, Jian Liu, Hongze Li and Xiaolong Li ()
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Zhuoran Yang: State Grid Nanjing Power Supply Company, Nanjing 210005, China
Lixiang Lv: State Grid Nanjing Power Supply Company, Nanjing 210005, China
Hao Wang: State Grid Nanjing Power Supply Company, Nanjing 210005, China
Yue Wang: State Grid Nanjing Power Supply Company, Nanjing 210005, China
Jian Liu: State Grid Nanjing Power Supply Company, Nanjing 210005, China
Hongze Li: State Grid Nanjing Power Supply Company, Nanjing 210005, China
Xiaolong Li: School of Electrical Engineering, Shenyang University of Technology, Shenyang 110870, China

Energies, 2025, vol. 18, issue 9, 1-14

Abstract: In three-phase three-post insulators, air gaps and crack defects are important sources of partial discharge and surface flashover. Using finite element analysis software, this study created a three-dimensional simulation model to investigate the effect of these defects on electric field distribution. The effects of crack defects and air gaps of different sizes and locations on the electric field distribution were then methodically investigated. According to the results, the most significant electric field distortion is caused by air gap defects close to the phase A conductor, and the distortion is exacerbated by shorter air gap lengths. Air gap length has much less effect on the electric field in the phase B conductor. There is no obvious change in electric field strength with the radius of air gap defects (0.1–2 mm). The electric field strength is negatively correlated with crack height; greater height reduces distortion, while crack width and depth are positively correlated with the surrounding field strength; greater dimensions increase distortion.

Keywords: three-phase three-post insulator; air gap defect; crack defect; electric field distribution (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: 2025
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