Share This Article:

SF6 Byproducts in High-Humidity Environment: an Experimental Evaluation between 200oC and 500oC

Abstract Full-Text HTML Download Download as PDF (Size:249KB) PP. 179-183
DOI: 10.4236/jemaa.2011.36029    4,047 Downloads   7,776 Views   Citations

ABSTRACT

Abstract: In the occurrence of arc discharges, spark discharges, corona discharges and overheated faults in electrical equipment, SF 6would be decomposed to complicated byproducts, such as SO2 , H2S and HF. Analyzing these byproducts is an effective method to judge the internal operation condition of electric equipment. In order to study characters of SF6byproducts at different temperature of overheated faults in the electric equipment, a series of overheated faults of electric equipment were simulated. SF6is very stable and not significantly decomposed at 200oC, 250oC and 300oC. SF6is significantly decomposed to SO2, H2S and HF at 350oC. The concentration of SO2, H2S and HF was 7.2, 1.6 and 1.9 μL/L after heating for 5 hours in environment of SF6with 3616 μL/L water, and it was increased to 23.0, 3.0 and 1.2 μL/L 3 hours later. SF6is more easily to be decomposed and decomposed more rapidly at higher temperature. The concentration of SO2, H2S and HF was 62.2, 15.6 and 3.6 μL/L after heating for 5 hours in environment of SF6with 4064 μL/L water, and it was increased to 91.4, 25.2 and 2.3 μL/L 3 hours later. SF6will be decomposed to format HF, which is strongly corrosive and whose concentration is likely to decrease when it is above a certain concentration.

Conflicts of Interest

The authors declare no conflicts of interest.

Cite this paper

Y. Wang, L. Li and W. Yao, "SF6 Byproducts in High-Humidity Environment: an Experimental Evaluation between 200oC and 500oC," Journal of Electromagnetic Analysis and Applications, Vol. 3 No. 6, 2011, pp. 179-183. doi: 10.4236/jemaa.2011.36029.

References

[1] M. Averyt, “SF6 By-products: Safety, Cleaning and Disposal Concerns,” U.S.EPA’s International Conference on SF6 and the Environment, San Antonio, 29 November 2006.
[2] J. L. Bessede and W. Krondorfer, “Impact of High Voltage SF6 Cir-cuit Breakers on Global Warming-Relative Contribution of SF6 Losses,” U.S.EPA’s conference, San Diego, 2-3 Novermber 2000.
[3] IEC60480, “Guidelines for the checking and treat-ment of sulfur hexafluoride (SF6) taken from electrical equip-ment and specification for its reuse,” Second edition, 2004.
[4] M. Mastroianni, “SF6 Analysis is the Key to Main-tenance,” Electrical World, Vol. 194, No. 9, 1980, pp. 92-96.
[5] I. Sauer, “Neutral Decomposition Products in Spark Breakdown of SF6,” IEEE Transactions on Electrical Insulation, Vol. 21, No. 2, 1986, pp: 111-115
[6] IEC 62271-303-2008, “High-Voltage Switchgear and Control-gear–Part 303: Use and Handling of Sulphur Hexafluoride (SF6),” First edition, 2008.
[7] X. X. Zhang, Y. Yao, J. Tang, C. X. Sun and L. Y. Wan, “Actuality and Perspective of Proxi-mate Analysis of SF6 Decomposed Products Under Partial Discharge,” High Voltage Engineering, Vol. 34, No. 8, 2008, pp. 664-669. (in Chinese)
[8] J. Tang, T. Li, L. Y. Wan, X. X. Zhang and Y. Yao, “Gaseous Decomposition Components Analysis Sys- tem ,” High Voltage Engineering, Vol. 34, No. 4, 2008, pp. 1583-1588. (in Chinese)
[9] Y. Wang, Z. Li, W. J. Yao, X. S. Zhuang and C. J. Huang, “Situation and Analysis of SF6 Byproducts of Gas Insulated Switchgear (220kV and above) in Guangdong Province,” High Voltage Engineering, Vol. 35, No. 4, 2009, pp. 823-828. (in Chinese)
[10] Z. Q. Zhang and H. S. Lian, “Using SO2 Detection for Failure Checking of SF6 Electricity Equipment,” Electric Power, Vol. 34, No. 1, 2001, pp. 77-80. (in Chinese)
[11] Y. Y. Wang, “Discussion of Ana-lyzing Internal Faults of SF6 Electric Equipment by SO2 Con-centrations,” Fujian Electric Power and Electrician, Vol. 21, No. 1, 2001, pp. 56-57. (in Chinese)
[12] W. J. Yao and N. W. Cheng, “Detection of Fault Characteristic Gases in SF6-Insulated Transformers,” Guangdong Electric Power, Vol. 12, No. 4, 1999, pp. 20-21. (in Chinese)
[13] L. M. Song, Q. Wu and L. C. Li, “Chromatograph Analysis of Toxic Impurities in SF6,” Liming Chemistry, Vol. 3, 1992, pp. 18-21. (in Chi-nese)
[14] W. Z. Wang, F. P. Yue and S. G. Xia, “Application of GC-MS in Analyzing Trace Impurities in SF6,” Electric Technology, Vol. 4, 1981, pp. 3-4. (in Chinese)
[15] L. Wang, “Analysis Technology of Trace Impurities in SF6 and its Ap-plication in Purifying Decomposition Gas of Arc Discharge,” Electric Technology, Vol. 6, 1988, pp. 10-14. (in Chi-nese)
[16] L. Wang and J. Z. Wang, “Preparation technique of S2OF10 gas standard sample and determination method of the trace S2OF10 in SF6,” Chinese Journal of Chromatography, Vol. 17, No. 5, 1999, pp.55-57. (in Chinese)
[17] W. W. Cheng, G. L. Ma and Q. L. Zhu, “Gas Chromatographic Determination of Trace Bispentafluorosulfur oxide in Sulfur Hexafluoride Using a Post-Column Switching and Temperature Programming Method,” Chinese Journal of Analytical Chemistry, Vol. 26, No. 12, 1998, pp. 1468-1470. (in Chinese)

  
comments powered by Disqus

Copyright © 2019 by authors and Scientific Research Publishing Inc.

Creative Commons License

This work and the related PDF file are licensed under a Creative Commons Attribution 4.0 International License.