操作冲击电压下C4F7N/CO2混合气体252kV GIL间隙及沿面放电特性

doi:10.19595/j.cnki.1000-6753.tces.200373

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摘要 C₄F₇N/CO₂混合气体作为有望在高电压等级气体绝缘输电管道（GIL）中替代SF₆的环保绝缘气体被广泛研究。在高电压等级下,操作冲击电压下的介质绝缘特性成为绝缘配合中无法忽略的重要因素,然而现阶段操作冲击电压下C₄F₇N/CO₂混合气体中间隙击穿和沿面闪络特性研究很少。该文通过实验研究操作冲击电压下C₄F₇N摩尔百分比为5%、9%、13%的C₄F₇N/CO₂混合气体中252kV GIL中间隙和沿面放电特性,并与0.5MPa SF₆中的实验结果进行对比。结果表明,放电电压随压强及混合气体C₄F₇N摩尔百分比升高而上升;放电存在盆式绝缘子凹面侧间隙-沿面闪络和间隙击穿两种形式;0.5MPa 13%C₄F₇N/87%CO₂、0.6MPa 9%C₄F₇N/91%CO₂混合气体下沿面绝缘强度达到0.5MPa下SF₆绝缘强度的87%以上,而0.7MPa 9%C₄F₇N/91%CO₂混合气体下沿面绝缘强度已超过0.5MPa下SF₆的绝缘强度。

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关键词 ： C₄F₇N/CO₂混合气体, 操作冲击电压, 间隙击穿, 沿面闪络, 252kV气体绝缘输电管道

Abstract：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.

Key words： C₄F₇N/CO₂ mixtures switching impulse voltage gap breakdown surface flashover 252kV gas insulated transmission line

收稿日期: 2020-04-15

PACS:

TM85

基金资助:国家重点研发计划项目（2017YFB0902500）和国家电网公司总部科技项目（环保管道输电关键技术）资助

通讯作者: 丁卫东男,1976年生,博士,教授,博士生导师,研究方向为高电压与绝缘技术及脉冲功率技术。E-mail: wdding@mail.xjtu.edu.cn

作者简介: 郑忠波男,1995年生,硕士研究生,研究方向为环保型气体绝缘介质的介电和放电特性。E-mail: zhongbo1995@stu.xjtu.edu.cn

引用本文:

郑忠波, 陈楠, 李志闯, 李强, 丁卫东. 操作冲击电压下C₄F₇N/CO₂混合气体252kV GIL间隙及沿面放电特性[J]. 电工技术学报, 2021, 36(14): 3055-3062. Zheng Zhongbo, Chen Nan, Li Zhichuang, Li Qiang, Ding Weidong. Discharge Characteristics of 252kV Gas Insulated Transmission Line under Switching Impulse Voltage in C₄F₇N/CO₂ Mixtures. Transactions of China Electrotechnical Society, 2021, 36(14): 3055-3062.

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