Results 31 to 40 of about 1,555 (283)

Methods for estimation of the vacuum status in vacuum circuit breakers [PDF]

, 1999
In this paper several methods are described for the estimation of the pressure inside vacuum interrupters which have been in operation for many years.
Bouwmeester, C.E., Damstra, G.C., Gruntjes, R.J.B., Merck, W.F.H.   +3 more
core   +1 more source

Коммутационные испытания экспериментального вакуумного выключателя [PDF]

, 2016
Актуальность работы обусловлена активно происходящим техническим перевооружением электрических сетей среднего класса напряжения на предприятиях нефтегазового комплекса Российской Федерации.
Кладько, Андрей Александрович, Лавринович, Валерий Александрович, Убиенных, Борис Иннокентьевич   +2 more
core  

Multimodal Mechanical Testing of Additively Manufactured Ti6Al4V Lattice Structures: Compression, Bending, and Fatigue

Advanced Engineering Materials, EarlyView.
In this experimental study, the mechanical properties of additively manufactured Ti‐6Al‐4V lattice structures of different geometries are characterized using compression, four point bending and fatigue testing. While TPMS designs show superior fatigue resistance, SplitP and Honeycomb lattice structures combine high stiffness and strength. The resulting
Klaus Burkart, Jonas Schmidt, Anastasiya Toenjes, Johanna Eisenträger   +3 more
wiley   +1 more source

Melting and Generation of Micro-Protrusions on Cathode Surface During Spark Conditioning Process in Vacuum [PDF]

, 2022
Spark conditioning is an effective method to increase the dielectric strength in vacuum by melting and removing micro-protrusions on the cathode surface. We aim to optimize the conditioning effect in vacuum for the application of vacuum circuit breakers (
Fukuda, Hideaki, Hayakawa, Naoki, Kita, Naoki, Kojima, Hiroki, Kondo, Fuminori, Yamamura, Kenta   +5 more
core   +1 more source

Microstructural Evolution and Vacancy Defect Formation in Mn–Mo–Ni RPV Steel Under Low Cycle Fatigue: Insights From EBSD and PALS

Advanced Engineering Materials, EarlyView.
Low‐cycle fatigue damage in Mn–Mo–Ni reactor pressure vessel steel is examined using a combined electron backscatter diffraction and positron annihilation lifetime spectroscopy approach. The study correlates texture evolution, dislocation substructure development, and vacancy‐type defect formation across uniform, necked, and fracture regions, providing
Apu Sarkar, Dhanadeep Dutta, G. Bharat Reddy   +2 more
wiley   +1 more source

Modeling and numerical simulation of anode activity and arc motion in a transverse magnetic field

AIP Advances, 2017
Vacuum interrupters based on transverse magnetic field contacts now are widely used in medium voltage circuit breakers. The arc motion under the transverse magnetic field (TMF) plays a decisive role in the interruption.
Ting Wang, Shixin Xiu, Dingyu Feng, Zixi Liu, Bo Yuan, Mengru Li   +5 more
doaj   +1 more source

Engineering Deformation and Failure in Diamond Triply Periodic Minimal Surface Lattices via 3D Wall‐Thickness Grading

Advanced Engineering Materials, EarlyView.
The work demonstrates that strategic wall‐thickness grading in diamond triply periodic minimal surface lattices enables precise tuning of deformation and failure behavior under compression. Different gradation patterns guide how and where the structure collapses, improving energy absorption or promoting controlled brittle failure.
Giovanni Rizza, Danilo Bruson, Manuela Galati, Luca Iuliano   +3 more
wiley   +1 more source

A non-contact method for vacuum degree detection in simulant vacuum interrupters using coaxial optical path laser-induced plasma

Discover Applied Sciences
This paper proposes a non-contact vacuum degree detection method for vacuum interrupters based on coaxial optical path laser-induced plasma (LIP), aiming to overcome the limitations of conventional techniques in accuracy and on-line applicability.
Zhe Liu, Jiangang Ding, Ying Zhang, Zaixing Peng, Pengcheng Yu, Shuaibin Wang   +5 more
doaj   +1 more source

Discharge characteristics for various discharge patterns under negative lightning impulse voltage in vacuum [PDF]

, 2016
In order to develop higher voltage vacuum interrupters (VIs), electrical insulation performances in vacuum should be improved. The discharge in VI has various and complex patterns, such as breakdown in vacuum gap and surface flashover on a solid ...
66956, 66957, 66958, 66959, 66960, 66961, Hayakawa, Naoki, Kimura, Toshinori, Kojima, Hiroki, Kong, Fei, Nakano, Yusuke, Tsukima, Mitsuru   +11 more
core   +1 more source

CO2 Reduction on Copper‐Nitrogen‐Doped Carbon Catalysts Tuned by Pulsed Potential Electrolysis: Effect of Pulse Potential

Advanced Functional Materials, EarlyView.
This study demonstrates that pulsed potential electrolysis significantly improves CO2 reduction performance on copper‐nitrogen doped carbon electrodes. The formation of cationic copper sites and metallic clusters as a function of applied intermittent potential leads to notable selectivity changes compared to potentiostatic reduction.
Dorottya Hursán, Janis Timoshenko, Andrea Martini, Hyo Sang Jeon, Eduardo Ortega, Martina Rüscher, Arno Bergmann, Aram Yoon, Uta Hejral, Antonia Herzog, Clara Rettenmaier, Felix T. Haase, Philipp Grosse, Beatriz Roldan Cuenya   +13 more
wiley   +1 more source