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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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

Received: 15 April 2020

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TM85

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	Zheng Zhongbo
	Chen Nan
	Li Zhichuang
	Li Qiang
	Ding Weidong

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Zheng Zhongbo,Chen Nan,Li Zhichuang等. Discharge Characteristics of 252kV Gas Insulated Transmission Line under Switching Impulse Voltage in C₄F₇N/CO₂ Mixtures[J]. Transactions of China Electrotechnical Society, 2021, 36(14): 3055-3062.

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https://dgjsxb.ces-transaction.com/EN/10.19595/j.cnki.1000-6753.tces.200373 OR https://dgjsxb.ces-transaction.com/EN/Y2021/V36/I14/3055

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