NDLI: A study on flow characteristics of a thermal expansion circuit breaker near the current zero period

Content Provider	IEEE Xplore Digital Library
Author	Jong-Chul Lee Kim, Y.J.
Copyright Year	2004
Description	Author affiliation: Electrotechnol. R&D Center, LG Ind. Syst., Cheongju, South Korea (Jong-Chul Lee)
Abstract	The recent market trend of gas circuit breakers, which have the most important duty to interrupt fault currents in a circuit, is getting more and more small size and low mechanical energy to reduce the cost and increase the reliability. However, the real testing of breakers are rather cost intensive and only demonstrate whether or not a circuit breaker interrupts. Therefore many researches using computational methods have been done for switching arc phenomena and applied to extend the information such as thermal and dielectric recognition. We have simulated switching processes of a thermal expansion circuit breaker that uses the combination of two interruption techniques, the self-expansion by the arc itself and the arc rotation by coils. In order to calculate the governing equations described the dominant physical processes accurately, the commercial CFD code, which is customized to allow the inclusion of arc plasma modeling by Fortran subroutines externally, has been used. Through this work, we have found such information about the thermal performance that the energy produced by the arc causes the pressure-rise in the chamber during high current period. As the current falls near current zero, furthermore, the gas flows back from this region over the arc and should extinguish the arc just after current zero. The results have been compared with various dimensions and verified with the measured arc voltage.
Sponsorship	Components, Packaging, and Manuf. Technol. Soc. of the Inst. of Electr. and Electron. Eng., Inc
Starting Page	41
Ending Page	46
File Size	833204
Page Count	6
File Format	PDF
ISBN	0780384601
DOI	10.1109/HOLM.2004.1353092
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2004-09-23
Publisher Place	USA
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Thermal expansion Circuit breakers Costs Circuit testing Fault currents Mechanical energy Dielectrics Computational modeling Circuit simulation Switching circuits
Content Type	Text
Resource Type	Article

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