Open AccessResearch on the long‐time operation performance of composite insulator shed hydrophobicity under hydrothermal conditions
Author(s) -
Cheng Li,
Shao Shanfeng,
Zhang Sida,
Liao Ruijin,
Yang Lijun,
Guo Chenjun
Publication year - 2018
Publication title -
high voltage
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.732
H-Index - 20
ISSN - 2397-7264
DOI - 10.1049/hve.2017.0117
Subject(s) - materials science , insulator (electricity) , composite number , scanning electron microscope , arc flash , surface energy , hydrothermal circulation , composite material , fourier transform infrared spectroscopy , microstructure , energy dispersive x ray spectroscopy , chemical engineering , engineering
Due to excellent anti‐pollution flashover performance, a composite insulator has become the most frequently and widely used insulator product in transmission lines. Sheath hydrophobicity is the core factor that determines the anti‐pollution flashover performance of the composite insulator. To study the change rule of insulator sheath hydrophobicity under the long‐term operation condition, more than 390 samples produced by the same manufacturer that had operated for 3–22 years were extracted from the adjacent lines to eliminate the impact of the running environment and manufacturer formula. To study the reasons for hydrophobic fluctuations, surface energy tests and Fourier transform infrared spectroscopy tests were conducted on the superficial layer materials based on a two‐droplet method. The change rule of the material physical and chemical properties with operation time was obtained. Next, the relationship between the surface microstructure of the material and operation time was determined by laser scanning confocal microscopy and scanning electron microscopy. Finally, based on the analysis results of surface energy and surface topography, the physical model of shed material hydrophobic variation in the operation process was obtained.