Surface Flashover Characteristics of the 252 kV Conical Insulator in C4F7N/CO2 Gas Mixture

This paper reports on an investigation into the surface flashover characteristics of the 252 kV conical insulator in a C 4 F 7 N/CO 2 mixture which is used as an alternative to SF 6 .This study was done for a quasi-uniform field using a 252 kV experimental platform. The influence of molar fraction a...

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Bibliographic Details
Published in:IEEE transactions on dielectrics and electrical insulation 2023-04, Vol.30 (2), p.1-1
Main Authors: Meng, Yang, Li, Zhichuang, Xue, Haorui, Ding, Weidong, Deng, Zichen, Liu, Wen
Format: Article
Language:English
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C<sub xmlns:ali="http://www.niso.org/schemas/ali/1.0/" xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">4 F<sub xmlns:ali="http://www.niso.org/schemas/ali/1.0/" xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">7 N/CO<sub xmlns:ali="http://www.niso.org/schemas/ali/1.0/" xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">2
Carbon dioxide
Conductors
Discharges (electric)
Electric potential
Flashover
Gas mixtures
Gas pressure
Insulators
Lightning
quasi-uniform field
Sulfur hexafluoride
Surface discharges
Surface flashover
Voltage
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Summary:This paper reports on an investigation into the surface flashover characteristics of the 252 kV conical insulator in a C 4 F 7 N/CO 2 mixture which is used as an alternative to SF 6 .This study was done for a quasi-uniform field using a 252 kV experimental platform. The influence of molar fraction and gas pressure are reported and compared to that in SF 6 . Results show that small quantities of C 4 F 7 N mixed in CO 2 can increase the surface flashover voltage. Four types of discharge traces are observed in the experiment, and most traces are on the concave side under both AC and LI voltage. The polarity effect is observed in C 4 F 7 N/CO 2 gas mixtures. An empirical formula is fitted for C 4 F 7 N/CO 2 mixtures by experimental data under LI(-), and 0.7 MPa 9%C 4 F 7 N/91%CO 2 mixture has great potential to replace 0.5 MPa SF 6 .
ISSN:1070-9878
1558-4135
DOI:10.1109/TDEI.2023.3249653