NDLI: Lightning impulse surface flashover characteristics of insulators in SF6/N2 and SF6/air below 0.25 MPa

Content Provider	IEEE Xplore Digital Library
Author	Rong Tan Youping Tu Cong Wang Xiao Li
Copyright Year	2012
Description	Author affiliation: Beijing Key Laboratory of High Voltage & EMC, North China Electric Power University, China (Rong Tan; Youping Tu; Cong Wang; Xiao Li)
Abstract	SF6 gas is used as the insulating medium in cubicle gas insulated switchgear (C-GIS) in low pressure (below 0.25 MPa). SF6 gas has several shortcomings, such as expensive price, significant greenhouse effect, therefore, exploring alternative media of SF6 gas is of important theoretical value and practical application significance. This paper focuses on the C-GIS switchgear which uses SF6 gas as insulating medium and works below 0.25 MPa pressure, and by using self-designed GIS test platform, the negative lightning impulse surface flashover characteristics of insulator models in SF6 with N2, air binary mixed gases have been tested under various mixing ratios and various pressures. The test results show that: in the test gas pressure range, the insulators' surface flashover strengths always increase with the increasing of air pressure in all kinds of gas mixtures, and the specific variation trends are related to the gas pressure and mixing ratio of gas mixtures; the content of SF6 in gas mixture has a great impact on the surface flashover strength, when a little SF6 is added to pure N2 or pure air, the insulators' surface flashover strength can be obviously improved, however, with the increase of the content of SF6, the rise of insulators' surface flashover strength has a saturated trend; SF6/N2 or SF6 /air gas mixtures with higher pressure can be used as insulating medium to replace pure SF6 gas with lower pressure.
Starting Page	145
Ending Page	148
File Size	267561
Page Count	4
File Format	PDF
ISBN	9781467304887
ISSN	1089084X
e-ISBN	9781467304870
e-ISBN	9781467304863
DOI	10.1109/ELINSL.2012.6251445
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2012-06-10
Publisher Place	USA
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Sulfur hexafluoride Flashover Insulators Electrodes Lightning Switchgear Gas mixture Surface flashover Negative polarity lightning impulse C-GIS
Content Type	Text
Resource Type	Article

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