NDLI: Effect of Nozzle Parameters on SF6 ARC Interruption

Content Provider	IEEE Xplore Digital Library
Author	Perkins, J.F. Frost, L.S.
Copyright Year	1963
Abstract	Experimental measurements of dielectric recovery following 400 ¿sec duration square current pulses of 350 A and 1000 A have been conducted on ten nozzle configurations with upstream and downstream pressures of 4 atm. and 1 atm. respectively. The data have been analyzed to determine the dependence of recovery, or current interruption capability, upon nozzle geometrical parameters. The analysis indicates that recovery is insensitive to nozzle divergence angle (ø) between 9°and 15°, but a cylindrical nozzle severely reduces arc interruption ability. Whereas recovery time tR decreases as the ratio of outlet area Ac to throat area At increases for low recovery voltages VR, a nozzle with a ratio of AC/ At equal to 2 minimizes tR at high VR because the nozzle expansion matches the expansion of the arc. The optimum value of upstream arc length u is about one half of the effective nozzle throat diameter. An increase in u causes a significant increase in ultimate dielectric strength, but if is greater than optimum, there is a tendency towards upstream energy accumulation, delaying recovery. Arc channel recovery is most rapid if the downstream arc length is either very short, thus limiting arc power input, or very long, thus reducing the voltage stress per unit length on the column when VR is applied.
Starting Page	961
Ending Page	970
Page Count	10
File Size	2300105
File Format	PDF
ISSN	00189510
Volume Number	PAS-92
Issue Number	3
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	1973-05-01
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Sulfur hexafluoride Pulse measurements Current measurement Dielectric measurements Data analysis Low voltage Dielectric breakdown Delay Stress
Content Type	Text
Resource Type	Article
Subject	Engineering Energy Engineering and Power Technology Electrical and Electronic Engineering

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