NDLI: A study on flashover characteristics of supporting insulators in SF under lightning impulse

Content Provider	IEEE Xplore Digital Library
Author	Yifan Qin Tao Wen Junping Zhao Jingtan Ma Yuan Li Tonglei Wang Jinzhong Li Qiaogen Zhang
Copyright Year	2015
Description	Author affiliation: China Electr. Power Res. Inst., Beijing, China (Jinzhong Li) \|\| Sch. of Electr. Eng., Xi'an Jiaotong Univ., Xi'an, China (Yifan Qin; Tao Wen; Junping Zhao; Jingtan Ma; Yuan Li; Tonglei Wang; Qiaogen Zhang)
Abstract	In recent years, $SF_{6}$ gas insulated switchgear (GIS) is increasingly widely used among the power system of China and the flashover characteristics on GIS insulator have attracted widely attention of many researchers. According to the previous research, it's found that surface conditions of the insulators have a great impact on flashover voltage. In this paper, the influence of the surface roughness of the insulator on its flashover characteristics in $SF_{6}$ had been studied. A 1000kV standard lightning impulse (SLI) generator was constructed to study the influence of surface roughness of insulators on flashover voltage under SLI. 72.5kV supporting insulators with different roughness were obtained by polishing the surface with different mesh numbers of abrasive paper. A laser scanning confocal microscope (LSCM) was used to observe the roughness of the insulator. The results showed that the flashover voltage of insulator increases within the $SF_{6}$ pressure ranges from 0.1MPa to 0.4MPa under SLI and decreases with the increasing surface roughness. This phenomenon was analyzed in consideration of the surface area and adsorption. It's also found that the roughness has a bigger impact on the flashover voltage under the negative SLI. The flashover voltage of rough insulator under negative SLI is higher than that under positive SLI, which is different from the flashover characteristics of the new smooth insulator.
Starting Page	604
Ending Page	607
File Size	1011370
Page Count	4
File Format	PDF
ISSN	21609241
e-ISBN	9781479989034
DOI	10.1109/ICPADM.2015.7295344
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2015-07-19
Publisher Place	Australia
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Flashover Insulators Rough surfaces Surface roughness Abrasives Sulfur hexafluoride Standard Lightning Impulse GIS Supporting Insulator Roughness
Content Type	Text
Resource Type	Article

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