SF₆-alternative gases for application in gas-insulated switchgear

Abstract

The environmental problems caused by greenhouse gases have received unprecedented attention. Sulfur hexafluoride (SF6), which is the preferred gas for use in gas-insulated switchgear (circuit breakers, disconnect switches, etc. for high-voltage electrical circuits), has a very high global warming potential, and there is a large international effort to find alternative gases. Recently, this effort has made important progress, with promising alternative gases being identified and tested. An overview, in particular the current state of the art, of the study of SF6-alternative gases is presented in the paper. The review focuses on the application of the SF6-alternative gases in gas-insulated switchgear, with detailed analysis of calculations and measurements of their basic physical properties, dielectric strengths, and arc-quenching capabilities. Finally, a discussion of and perspectives on current research and future research directions are presented.

Partial discharge characteristics of C6F12O/CO2 mixed gas at power frequency AC voltage

“…), SF 6 mixed gases, perfluorinated compounds and some other electronegative gases. [2][3][4][5][6] The environmentally friendly gas used in medium and low voltage equipment is mainly natural gas. Because the gas cost is low, the nature is stable, and it is harmless to the environment.…”

Assessment of SF6 and N2 Gas Mixtures as a Dielectric Medium in a Gas Insulated Busduct

“…To reduce the use of SF 6 gas can be done by use of SF 6 gas mixtures. There are substitutes to the SF 6 gas which are satisfying all the requirements such as chemical, electrical, physical properties [3]. SF 6 & N 2 gas is observed to be good choice in particle contamination than SF 6 -CO 2 and SF 6 -Air mixture [5].…”

Numerical thermofluid simulation of a decaying arc behavior in CO2/O2/C5F10O (C5‐PFK) considering more than nona‐atomic molecules

“…For the above reasons, much effort has been made to search for alternatives for SF 6 . Recently, C 5 F 10 O (C5‐PFK) and C 4 F 7 N (C4‐PFN) with CO 2 have attracted attention as alternatives gases for SF 6 . C 5 F 10 O (C5‐PFK) is in the liquid phase in the standard state, and its GWP is lower than unity.…”

“…However, there are little data available to study interruption ability of CO 2 /O 2 /C 5 F 10 O (C5‐PFK). Thus, a more detailed understanding of the fundamental properties of CO 2 /O 2 /C 5 F 10 O (C5‐PFK) is necessary for further progress in research and development of circuit breakers using CO 2 /O 2 /C 5 F 10 O (C5‐PFK) as arc quenching medium as well as other various gases .…”