NDLI: Influence regularity of O2 on dielectric and decomposition properties of C4F7N–CO2–O2 gas mixture for medium-voltage equipment

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Influence regularity of O2 on dielectric and decomposition properties of C4F7N–CO2–O2 gas mixture for medium-voltage equipment

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Influence regularity of O2 on dielectric and decomposition properties of C4F7N–CO2–O2 gas mixture for medium-voltage equipment

Content Provider	IET Digital Library
Author	Li, Yi Zhang, Xiaoxing Ye, Fanchao Chen, Dachang Tian, Shuangshuang Cui, Zhaolun
Abstract	Fluorinated nitrile (C4F7N) gas mixture has been introduced as the most promising candidate to replace sulfur hexafluoride using in gas-insulated equipment. In this study, the authors explored the influence of oxygen on the dielectric and decomposition properties of C4F7N–CO2–O2 gas mixture. The authors found that the dielectric strength of the C4F7N–CO2–O2 gas mixture with 2, 4, 6, 8 and 10% O2 was increased by 4.85%, 6.49%, 7.70%, 3.21% and 2.74% compared with C4F7N–CO2. The addition of 2–6% O2 to the C4F7N–CO2 gas mixture could effectively reduce the content of most of the decomposition by-products such as CF4, CO, C2F6, C3F6, C3F8, CF3CN, C2F5CN, (CN)2. While high content of oxygen (>6%) results in higher decomposition of C4F7N, which has a negative effect on the stability of C4F7N gas mixture. Generally, it is recommended to add 2–6% O2 in the C4F7N–CO2 gas mixture to improve its insulation properties as well as inhibit the decomposition of C4F7N in the discharge for medium-voltage engineering application.
Starting Page	256
Ending Page	263
Page Count	8
Volume Number	5
e-ISSN	23977264
Issue Number	Issue 3, Jun (2020)
Alternate Webpage(s)	https://digital-library.theiet.org/content/journals/hve/5/3
Alternate Webpage(s)	https://digital-library.theiet.org/content/journals/10.1049/hve.2019.0219
Journal	High Voltage
Publisher	The Institution of Engineering and Technology CEPRI
Publisher Date	2020-01-23
Access Restriction	Open
Rights License	Creative Commons Attribution License (http://creativecommons.org/licenses/by/3.0/)
Subject Keyword	C2F5CN C2F6 C3F6 C3F8 C4F7N C4F7N–CO2–O2 Gas Mixture CF4 Decomposition Decomposition Property Dielectric Property Electric Strength Fluorinated Nitrile Gas Mixture Gas Insulated Switchgear Gas Mixtures Gas-insulated Equipment Gaseous Insulation, Breakdown And Discharges Insulation Property Medium-voltage Equipment O2 Power Apparatus Power Equipment Manufacturing Sulphur Compound Switch
Content Type	Text
Resource Type	Article

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