Experimental and Theoretical Studies of C3F7CN/CO2 Mixture Decomposition Under Overheating Fault

Mingyue Zhao; Dong Han; Weikang Zhao; Zhenrui Zhou; Guoqiang Zhang

doi:10.17775/CSEEJPES.2019.03180

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Experimental and Theoretical Studies of C₃F₇CN/CO₂ Mixture Decomposition Under Overheating Fault

Regular Papers | 更新时间：2026-10-15

- Experimental and Theoretical Studies of C₃F₇CN/CO₂ Mixture Decomposition Under Overheating Fault
- CSEE Journal of Power and Energy Systems Vol. 8, Issue 3, Pages: 941-951(2022)
- 作者机构：
  
  Institute of Electrical Engineering, Chinese Academy of Sciences, and University of Chinese Academy of Sciences,Beijing,China
- 作者简介：
- 基金信息：
- DOI：10.17775/CSEEJPES.2019.03180
  CLC：
- Published：01 May 2022
- 稿件说明：
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Mingyue Zhao, Dong Han, Weikang Zhao, et al. Experimental and Theoretical Studies of C₃F₇CN/CO₂ Mixture Decomposition Under Overheating Fault[J]. CSEE Journal of Power and Energy Systems, 2022, 8(3): 941-951. DOI: 10.17775/CSEEJPES.2019.03180.
DOI：

Mingyue Zhao, Dong Han, Weikang Zhao, et al. Experimental and Theoretical Studies of C₃F₇CN/CO₂ Mixture Decomposition Under Overheating Fault[J]. CSEE Journal of Power and Energy Systems, 2022, 8(3): 941-951. DOI: 10.17775/CSEEJPES.2019.03180. DOI：

摘要

Abstract

Heptafiuoroisobutyrontrile (C3F7CN) performs well in dielectric properties and environmental protection

which has the potential to replace SF6 gas. The decomposition characteristics of C3F7CN mixture under fault conditions directly affect the possibility of its replacement for SF6 gas. However

the number of studies on the decomposition characteristics of C3F7CN mixture under overheating fault is less. In this paper

the decomposition characteristics of C3F7CN/CO2 mixture under an overheating fault are studied by gas chromatography-mass spectrometry (GC/MS) and quantum chemical calculations. By-products CO

C3F6 and HF are detected at 200°C. At 550°C

the C3F7CN molecule begins to decompose and produces CHF3

C2F4

CF3CN and CNCN. Moreover

the results of GC/MS show that the insulation medium C3F7CN contains an impurity

which is C3HF7 (HFC-227ea). Combined with the results of GC/MS and quantum chemistry calculations

it can be concluded that the decomposition by-product C3F6 at 200°C mainly comes from the decomposition of C3HF7. C3HF7 reduces the decomposition temperature of the C3F7CN/CO2 mixture. Therefore

it is very important to improve the purity of the insulation medium C3F7CN.

关键词

Keywords

references

28. European Chemicals Agency. ( 2019, Aug. ). CL Inventory database [Online ] . https://echa.europa.eu/information-on-chemicals/c linventory-database/-/discli/details/126251.

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