Results 1 to 10 of about 341 (263)

Analysis of Arc Re-Ignition in Vacuum Interrupter-Based HVdc Circuit Breakers

IEEE Access
The protection of HVdc systems has long been challenged by the absence of natural current zero-crossing, typically addressed using L-C branches. However, the phenomenon of multiple arc reignitions in vacuum interrupter (VI) based HVdc circuit breakers ...
Tamer Eliyan, Ali Saeed Almuflih, Z. M. S. Elbarbary, Fady Wadie   +3 more
doaj   +1 more source

Boltzmann equation studies on electron swarm parameters in Townsend breakdown of copper vapor plasma using independently assessed electron-collision cross sections

AIP Advances, 2019
Electron transport coefficients in copper vapor plasma are calculated both by two-term expansion of electron Boltzmann equation Bolsig+ and tracking the random motion of electrons using Monte Carlo collision code METHES based upon recently evaluated ...
Wei Yang, Xiaohui Meng, Qianhong Zhou, Zhiwei Dong   +3 more
doaj   +1 more source

Microstructure Formation and Resistivity Change in CuCr during Rapid Solidification

Metals, 2017
The formation of the surface-near microstructure after a current interruption of CuCr contact materials in a vacuum interrupter is characterized by a fast heating and subsequently rapid solidification process.
Ulla Hauf, Alexander Kauffmann, Sandra Kauffmann-Weiss, Alexander Feilbach, Mike Boening, Frank E. H. Mueller, Volker Hinrichsen, Martin Heilmaier   +7 more
doaj   +1 more source

Improving interruption performance of mechanical circuit breakers by controlling pre-current-zero wave shape

High Voltage, 2019
Mechanical circuit breakers (MCBs) are the limiting component for current injection HVDC circuit breakers. Improving their interruption performance reduces requirements for capacitance and inductance needed in the injection circuit and thus space use and
Tim Schultz, Benjamin Hammerich, Benjamin Hammerich, Lorenz Bort, Christian M. Franck, Christian M. Franck   +5 more
doaj   +1 more source

Design and Experimental Testing of a Moving Coil Actuator with Compensation Coils

CSEE Journal of Power and Energy Systems
Hydrogen-powered electric aircraft have attracted significant interests aiming to achieve decarbonization targets. Onboard DC electric networks are facing great challenges in DC fault protection requirements.
Boyuan Yin, Xianwu Zeng, John Frederick Eastham, Emelie Nilsson, Jean-francois Rouquette, Jean Rivenc, Ludovic Ybanez, Xiaoze Pei   +7 more
doaj   +1 more source

Analysis of Circuits Supplying Thomson Coil Actuator Operating in Vacuum Contact Units of DC and AC Ultra-Fast Circuit Breakers

Energies
The use of vacuum-hybrid DC circuit breaking methods allows the short-circuit current to be switched off in a shorter time, resulting in a reduction in the arc burning time. This requires the use of a drive, such as the Thomson Coil Actuator TCA, capable
Michal Rodak, Piotr Borkowski
doaj   +1 more source

Analysis and Optimization of Contact Material Ablation under the Cumulative Effect of the Number of Breakings of OLTC. [PDF]

Materials (Basel), 2023
Zhang M, Tan Y, Yang C, Deng J, Xie Z.
europepmc   +1 more source

Investigation of vacuum arc ignition characteristics and erosion morphology microstructure characteristics of CuCr55 electrode contact materials

AIP Advances
Copper–chromium alloy material, as one of the most important electrode contact materials in the field of electrical contact, has been widely used in vacuum interrupters.
Siyuan Liu, Xianglai Bo, Zhiyuan Liu, Yingsan Geng   +3 more
doaj   +1 more source

Experiments with vacuum interrupters used for large dc-current interruption [PDF]

, 1977
Vacuum interrupters have been tested in circuits similar to those used in theta-pinch and Tokamak fusion devices. The effects on performance of auxiliary circuit components and axial magnetic fields have been determined, and limits to lifetime caused by mechanical and electrical wear have been measured.
openaire   +2 more sources

A fuse‐based DC circuit breaker with vacuum interrupter enhanced by an external transverse magnetic field

High Voltage
Due to the increasing power system capacity, the interruption of large fault currents has gradually become a major challenge in power systems. At the moment, such currents are interrupted mainly via circuit breakers based on the method of active current ...
Yu Xiao, Yi Wu, Yifei Wu, Fei Yang, Mingzhe Rong, Zhuo Yang   +5 more
doaj   +1 more source