Results 241 to 250 of about 4,011 (301)

Timings of high voltage circuit-breaker

Electric Power Systems Research, 2008
The reliability of an electrical power system is influenced by the operation of circuit-breaker (CB). A good indicator of circuit-breaker condition is its switching time. Based on it some of the critical circuit-breaker irregularities can be detected and removed before they develop to a failure.
Gerd Balzer
exaly   +2 more sources

Radiometric Timing of High-Voltage Circuit-Breaker Opening Operations

IEEE Transactions on Power Delivery, 2011
This paper demonstrates the feasibility of radiometric on-line circuit breaker timing. The timing test is crucial and can reveal a wide range of faults or defects. The work presented concentrates on the timing of gas-insulated substation (GIS) circuit breakers, which due to their enclosed nature pose a variety of challenges not encountered in air ...
Meier, S. D., Moore, P. J., Coventry, P. F.   +2 more
openaire   +4 more sources

Series Connection of Gas and Vacuum Circuit Breakers as a Hybrid Circuit Breaker in High-Voltage Applications

IEEE Transactions on Plasma Science, 2020
Possible sulfur hexafluoride (SF6) gas alternatives have been the focus of research and development in science and industry for many years. After the revision of the European F-Gas regulation 517/2014, the investigation has been even more intensified. One option for an approach for realizing an environmentally friendly switchgear for the high-voltage ...
Nicolas Gotte, Thomas Krampert, Paul Gregor Nikolic   +2 more
exaly   +2 more sources

Improving Low-Voltage DC Circuit Breaker Performance Through an Alternate Commutating Circuit

IEEE Transactions on Industry Applications, 2019
Current interruption in dc circuits is more challenging than in their ac counterparts due to the absence of natural current zero-crossing and resistive nature of the dc grids.
Sudipta Sen, Shahab Mehraeen
exaly   +2 more sources

High voltage vacuum circuit breakers

IEEE Transactions on Power Apparatus and Systems, 1975
A new line of high voltage vacuum power circuit breakers is being developed for 121 kV and above and will use the new vacuum interrupter module presented in a companion paper3. The first ratings in production will be 242 kV with interrupting capabilities of 40,000 amperes, followed by breakers rated 50,000 amperes; both of these will have continuous ...
R.B. Shores, V.E. Phillips
openaire   +1 more source

Interrupters for high-voltage circuit breakers

Electrical Engineering, 1957
The demand for higher breaker voltages and interrupting ratings created by today's expanding energy requirements presents numerous design and test problems. A new line of high-power tubular multibreak-type interrupters has been developed, features of which include accessibility, simplicity of replacement, and a design that can be verified by part ...
A. W. Hill, R. E. Friedrich
openaire   +1 more source

High-voltage oil circuit breakers

Electrical Engineering, 1950
ONLY a few years ago, 3,500,000 kva was the maximum standard rated interrupting capacity for high-voltage circuit breakers, and the interrupting-time ratings were mostly five and eight cycles. This article describes recent developments in interrupting devices that have made available standard circuit breakers for 5,000,000-kva interrupting capacity and
W. M. Leeds, R. E. Friedrich
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