NDLI: Computational investigation of arc behavior in an auto-expansion circuit breaker contaminated by ablated nozzle vapor

Content Provider	IEEE Xplore Digital Library
Author	Jin Ling Zhang Jiu Dun Yan Murphy, A.B. Hall, W. Fang, M.T.C.
Copyright Year	1973
Abstract	PC-based arc modeling taking account of the effects of nozzle ablation and the mixing process of PTFE vapor with SF/sub 6/ has been carried out for a full-scale auto-expansion circuit breaker with a moving contact. An equation to calculate the PTFE concentration in the mixture is introduced together with overall mass, momentum, and energy conservation equations for the mixture. The thermodynamic and transport properties of SF/sub 6/-PTFE vapor mixture calculated by the transport theory are given. An empirical relationship between radiation reabsorption factor and the relevant arcing parameters (nozzle size and instantaneous arcing current) has been employed to make predictions. The features of temperature, pressure, PTFE mass concentration, and flow fields during the whole arcing period are discussed. It is shown that the energy brought into the expansion volume by the hot PTFE vapor is mainly responsible for the pressure buildup. The propagation of the pressure wave in the expansion volume is responsible for the pressure peaks in the second loop of arcing. The predicted arc voltage and pressure variation are compared with the test results and with those predicted using the thermodynamic and transport properties of pure SF/sub 6/. Results show that the use of the properties of SF/sub 6/-PTFE vapor mixture substantially improves the agreement between the predicted and measured pressure rise in the expansion volume.
Sponsorship	IEEE Nuclear and Plasma Sciences Society
Starting Page	706
Ending Page	719
Page Count	14
File Size	562513
File Format	PDF
ISSN	00933813
Volume Number	30
Issue Number	2
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2002-04-01
Publisher Place	U.S.A.
Access Restriction	One Nation One Subscription (ONOS)
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Circuit breakers Thermodynamics Equations Chemicals Energy conservation Temperature Voltage Circuit testing Volume measurement Pollution measurement
Content Type	Text
Resource Type	Article
Subject	Nuclear and High Energy Physics Condensed Matter Physics

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4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
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