温度对C4F7N/CO2混合气体工频放电场强的影响规律

doi:10.19595/j.cnki.1000-6753.tces.190900

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Abstract C₄F₇N/CO₂ mixture has the potential to replace SF₆ gas in electrical equipment such as GIS or GIL as insulating dielectric. Its insulation performance is the basis for insulation design of electrical equipment. Electrical equipment can’t avoid to encounter different ambient temperatures in operation. It is necessary to study the insulation performance of C₄F₇N/CO₂ mixture when temperature changes. The insulation properties of C₄F₇N/CO₂ mixture at room temperature have been studied a lot, but seldom at different temperatures. In this paper, the influence of temperature on the critical discharge field intensity of C₄F₇N/CO₂ gas mixture in the temperature range from -35~20℃ is studied. A calculation model of the critical discharge field intensity of C₄F₇N/CO₂ mixture is established at different temperatures. In order to verify the calculation model, we did breakdown experiments at different temperatures. The power frequency discharge voltages at different temperatures are obtained for C₄F₇N/CO₂ mixture at pressures 0.6MPa and 0.7MPa with 9% C₄F₇N. The liquefaction temperature of 9% C₄F₇N/CO₂ mixture at 0.7MPa and 0.6MPa is about -19℃ and -23℃ respectively. The experimental results verify the validity of the calculation model. At the same time, it is found that after liquefaction, the power frequency discharge field intensity decreases significantly with the decrease of temperature. The critical discharge field intensity of C₄F₇N/CO₂ mixture with different ratios at 0.6MPa and 0.7MPa is studied using the calculation model. The power frequency discharge field intensity of C₄F₇N/CO₂ gas mixture at different mixing ratio and temperature is obtained.

Key words： SF₆ alternative gas C₄F₇N/CO₂ mixed gas liquefaction temperature gas discharge

Received: 21 July 2019 Published: 17 January 2020

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https://dgjsxb.ces-transaction.com/EN/10.19595/j.cnki.1000-6753.tces.190900 OR https://dgjsxb.ces-transaction.com/EN/Y2020/V35/I1/52

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