典型断口结构下C4F7N/CO2混合气体绝缘特性实验研究与仿真分析

doi:10.19595/j.cnki.1000-6753.tces.201117

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Abstract

Eco-friendly C₄F₇N/CO₂ mixed gas is one of the most potential substitutes for SF₆ at present. In order to study the insulation characteristic of the C₄F₇N/CO₂ mixed gas, and to search its matching relationship with the electric field under the typical clearance structure, the prototype was designed based on 72.5kV switch product including two kinds of electrode structures: disconnecting contact and coaxial electrode. The effects of different inflation pressures and different contact distances on the gas insulation performance under lightning impulse voltage was studied by experiments, and the electric field distribution changes under different clearance structures and different clearance distances were obtained through simulation calculation. Experimental and simulation results show that under the disconnecting contact structure and the coaxial electrode structure, 20%C₄F₇N+80%CO₂ mixed gas with a gauge pressure of 0.4MPa and 16.7% C₄F₇N+83.3%CO₂ mixed gas with a gauge pressure of 0.5MPa, of which the insulation strength can reach more than 80% of the pure SF₆ gas insulation strength at the same pressure. Under the disconnecting contact structure, the clearance distance is 8mm, 246kV applied voltage (50% breakdown voltage at 0.4MPa), the highest electric field strength between clearances is 38.3kV/mm; under the coaxial electrode structure, the gap is 10mm, and the applied voltage is 228.5kV (50% breakdown voltage at 0.4MPa), the highest electric field strength between coaxial gaps is 26.8kV/mm. In order to achieve the insulation level of pure SF₆ gas at a gauge pressure of 0.4MPa and a distance of 6mm, the pressure of the C₄F₇N/CO₂ mixed gas can be increased to 0.5MPa or the contact distance can be increased to about 8mm. At the end of this article, the field strength design basis of C₄F₇N/CO₂ mixed gas is discussed. The experimental research and simulation analysis in this article have verified the feasibility of C₄F₇N/CO₂ mixed gas engineering application, Especially, it has guiding significance for the design of insulation structure when C₄F₇N/CO₂ mixed gas is used in switchgear.

Key words： C₄F₇N/CO₂ insulation characteristics typical clearance structure simulation analysis

Received: 28 August 2020

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TM213

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	Xin Zhaozhao
	Jiang Xu
	Huo Peng

Cite this article:

Xin Zhaozhao,Jiang Xu,Huo Peng. Experimental Research and Simulation Analysis of Insulation Characteristics of C₄F₇N/CO₂ Mixed Gas under Typical Clearance Structure[J]. Transactions of China Electrotechnical Society, 2021, 36(17): 3572-3580.

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https://dgjsxb.ces-transaction.com/EN/10.19595/j.cnki.1000-6753.tces.201117 OR https://dgjsxb.ces-transaction.com/EN/Y2021/V36/I17/3572

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