Results 211 to 220 of about 1,128 (267)

Flow Behavior in High-Voltage Circuit Breaker

IEEE Transactions on Plasma Science, 2011
Since several years, high-voltage circuit breakers (voltages of up to 800 kV) have been studied by the thermal plasma community to attain high level of reliability, good operating economy, and long intervals without maintenance. The studies are also related to gas substitution in order to replace SF6. This feature consists to study, by a numerical tool
Jean-Jacques Gonzalez, Pierre Freton
openaire   +1 more source

Contact Erosion in High Voltage Circuit Breakers

2018 IEEE Electrical Insulation Conference (EIC), 2018
During current interruption in the high voltage circuit breaker, the contacts are eroded due to high temperature in the arc zone. This may influence the lifetime of the breaker and even current interruption process. Although there are many parameters that influence contact erosion, the work presented in this paper focuses on the shape of the contact ...
M. T. Dhotre, X. Ye, S. Kotilainen
openaire   +1 more source

Condition monitoring of high voltage circuit breakers

Proceedings of IEEE. AFRICON '96, 2002
The advances made in microprocessor-based measuring equipment can be used to good effect to determine the condition of a circuit breaker. In essence a very effective condition monitoring tool is represented by a number of products that are now commercially available.
M.H.B. de Grijp, J.S. Bedet, R.A. Hopkins, J.E. Greyling   +3 more
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Arc Energy in High Voltage Circuit Breakers

Arabian Journal for Science and Engineering, 2012
This work is devoted to the study of the energy balance at the opening of an SF6 circuit breaker. A new model is proposed to simulate the thermal exchanges involved around the current zero as a function of time. The theoretical basis of this model consists of the coupling of the electric and thermal equations of the arc plasma, which takes into account
A. Ziani, H. Moulai
openaire   +1 more source

High voltage oil circuit breakers

Electrical Engineering, 1932
MECHANICAL maintenance of high voltage circuit breakers is of considerable importance to the successful operation of power systems. Experience obtained over a number of years has proved that in many ways existing equipment may be modernized and betterments provided by the operating engineer.
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Condition monitoring of high voltage circuit breakers

2022
This thesis was scanned from the print manuscript for digital preservation and is copyright the author. Researchers can access this thesis by asking their local university, institution or public library to make a request on their behalf. Monash staff and postgraduate students can use the link in the References field.
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Worldwide Reliability Survey of High-Voltage Circuit Breakers

IEEE Industry Applications Magazine, 1995
CIGRE 13.06 Working Group has conducted two worldwide reliability surveys of the reliability of high-voltage circuit breakers of 63 kV and above. The first enquiry included 78000 breaker-years of "in-service data" from 102 companies in 22 countries during the years 1974 through 1977 and included all interrupting technologies.
openaire   +1 more source

Development of High Voltage Vacuum Circuit Breakers in China

2006 International Symposium on Discharges and Electrical Insulation in Vacuum, 2006
This paper introduces research work on the development of high-voltage (HV) vacuum circuit breakers (VCBs) in China from its starting point in 1989 to 2006. In this period, a 126-kV two-breaks VCB prototype and a 126-kV single-break VCB prototype were developed. A latest 252-kV single-break interrupter prototype is introduced. Five HV VCBs technologies
Zhiyuan Liu, Jimei Wang, Shixin Xiu, Zhongyi Wang, Shun Yuan, Li Jin, Heming Zhou, Ren Yang   +7 more
openaire   +1 more source

Comparison of Synthetic Test Circuits for Ultra-High-Voltage Circuit Breakers

IEEE Power Engineering Review, 1996
Three synthetic test circuits to verify the interrupting performance of UHV circuit breakers (765kV, 63kA, 50Hz) are compared on aspects of equivalence, operation, required capacitive energy and applicability. The comparisons show that, although each circuit has its own merits, the EPIC circuit appears to be very attractive.
B.L. Sheng, L. van der Sluis
openaire   +1 more source

A Multiorifice Interrupter for High-Voltage Oil Circuit Breakers

Transactions of the American Institute of Electrical Engineers, 1943
High-voltage oil circuit breakers for high-speed operation generally use some form of multibreak contact arrangement. These breakers perform satisfactorily but lack the simplicity of the conventional slower-speed two-break construction. The development of an unusually effective multi-orifice oil-flow interrupting unit now makes it possible to reduce ...
L. R. Ludwig, W. M. Leeds
openaire   +1 more source