Discharge Characteristics of 252kV Gas Insulated Transmission Line under Switching Impulse Voltage in C4F7N/CO2 Mixtures

被引：0
|
作者：
Zheng Z. [1 ]
Chen N. [2 ]
Li Z. [1 ]
Li Q. [2 ]
Ding W. [1 ]
机构：
[1] State Key Laboratory of Electrical Insulation and Power Equipment, Xi'an Jiaotong University, Xi'an
[2] Xi'an High Apparatus Research Institute Co. Ltd, Xi'an
来源：
Diangong Jishu Xuebao/Transactions of China Electrotechnical Society | 2021年 / 36卷 / 14期
关键词：
252kV gas insulated transmission line; C[!sub]4[!/sub]F[!sub]7[!/sub]N/CO[!sub]2[!/sub] mixtures; Gap breakdown; Surface flashover; Switching impulse voltage;
D O I：
10.19595/j.cnki.1000-6753.tces.200373
中图分类号：
学科分类号：
摘要：
C4F7N/CO2 mixed gas has been widely studied as an environmentally friendly insulating gas that is expected to replace SF6 in high-voltage gas insulated transmission line (GIL). In high-voltage power systems, the dielectric characteristics of the medium under switching impulse have become an important factor. However, there are few studies on gap breakdown and flashover characteristics of C4F7N/CO2 mixtures under switching impulse voltage. This paper studies the gap breakdown and flashover characteristics of 252kV GIL in C4F7N/CO2 mixtures with C4F7N content of 5%, 9%, and 13%, and compares them with the experimental results in 0.5MPa SF6. The results show that the discharge voltage increases with the increase of the gas pressure and the content of C4F7N. There are two forms of discharge. One is gap-surface flashover and the other is gap breakdown. The electrical insulation strength under 0.5MPa 13% C4F7N/87% CO2 and 0.6MPa 9% C4F7N/91% CO2 mixtures reaches over 87% of the electrical insulation strength under SF6 at 0.5MPa, and the electrical insulation strength under 0.7MPa 9% C4F7N/91% CO2 exceeds the insulation strength of SF6 at 0.5MPa. © 2021, Electrical Technology Press Co. Ltd. All right reserved.
引用
收藏
页码：3055 / 3062
页数：7
相关论文
共 18 条
  • [1] Xiao Dengming, Yan Jiudun, Application and development of gas insulated transmission line, High Voltage Engineering, 43, 3, pp. 17-25, (2017)
  • [2] Kieffel Y, Bertloot T, Souchal S, Et al., Characteristics of g3-an alternative to SF<sub>6</sub>, International Conference on Dielectrics, pp. 91-97, (2016)
  • [3] Kieffel Y, Biquez F., SF<sub>6</sub> alternative development for high voltage switchgears, Electrical Insulation Conference, pp. 379-383, (2015)
  • [4] 3M<sup>™</sup> Novec<sup>™</sup> 4710 Insulating Gas
  • [5] Zhao Mingyue, Han Dong, Zhou Zhenrui, Et al., Adsorption characteristics of activated alumina and molecular sieves for C<sub>3</sub>F<sub>7</sub>CN/CO<sub>2</sub> and its decomposition by-products of overheating fault, Transactions of China Electrotechnical Society, 35, 1, pp. 88-96, (2020)
  • [6] Kieffel Y, Irwin T, Ponchon P, Et al., Green gas to replace SF<sub>6</sub> in electrical grids, IEEE Power & Energy Magazine, 14, 2, pp. 32-39, (2016)
  • [7] Yuan Ruijun, Li Han, Zheng Zheyu, Et al., Experiment on the compatibility between C<sub>3</sub>F<sub>7</sub>CN/CO<sub>2</sub> gas mixture and epoxy resin used in gas insulated transmission line, Transactions of China Electrotechnical Society, 35, 1, pp. 70-79, (2020)
  • [8] Nechmi H E, Beroual A, Girodet A, Et al., Fluoronitriles/ CO<sub>2</sub> gas mixture as an eco-friendly alternative candidate to SF<sub>6</sub> in high voltage insulation systems, Conference on Electrical Insulation and Dielectric Phenomena, pp. 384-387, (2016)
  • [9] Nechmi H E, Beroual A, Girodet A, Et al., Fluoronitriles/ CO<sub>2</sub> gas mixture as promising substitute to SF<sub>6</sub> for insulation in high voltage applications, IEEE Transactions on Dielectrics & Electrical Insulation, 23, 5, pp. 2587-2593, (2017)
  • [10] Li Zhichuang, Ding Weidong, Gao Keli, Et al., Surface flashover characteristics of epoxy insulator in C<sub>4</sub>F<sub>7</sub>N/ CO<sub>2</sub> mixtures under lightening impulse voltage, High Voltage Engineering, 45, 4, pp. 1071-1077, (2019)
12