Results 21 to 30 of about 3,549 (258)

Calibration Proposal for UHF Partial Discharge Measurements at Power Transformers [PDF]

Energies, 2019
The continuous, non-intermitted service of electrical grids relies on the reliability of their assets, e.g., power transformers. Local insulation defects can result in serve failures such as breakdowns with severe subsequent costs. The prevention of such events is crucial.
Martin Siegel, Sebastian Coenen, Michael Beltle, Stefan Tenbohlen, Marc Weber, Pascal Fehlmann, Stefan Hoek, Ulrich Kempf, Robert Schwarz, Thomas Linn, Jitka Fuhr   +10 more
openaire   +2 more sources

Investigation of Laser Ablation and Brush Pre‐Treatments for AlCu Cold Roll Bonding in Oxygen‐Free Conditions

Advanced Engineering Materials, EarlyView.
It is shown that laser ablation pretreatment under oxygen‐free conditions enables copper–aluminium bonding at significantly lower deformation degrees and improved properties compared to mechanical brushing. Laser ablation further increases interface contact area and induces favourable residual stress states and microstructural compatibility ...
Khemais Barienti, Finn‐Lennard Janthur, Selina Raumel, Sascha Jan Zimmermann, Sarah Seffer, René Gustus, Sebastian Herbst, Marc C. Wurz, Ludger Overmeyer, Wolfgang Maus‐Friedrichs, Hans Jürgen Maier, Florian Nürnberger   +11 more
wiley   +1 more source

Instrumentation system for location of partial discharges using acoustic detection with piezoelectric transducers and optical fiber sensors [PDF]

, 2014
In this paper, a multichannel instrumentation system for the location of partial discharges (PDs) in power transformers is presented. It is based on the detection of the acoustic emissions from PDs in oil with several piezoelectric (PZT) and fiber optic ...
Búa-Núñez, Iago, García-Souto, José A., Posada-Román, Julio E., Rubio-Serrano, Jesús   +3 more
core   +2 more sources

Characterization of Nitinol Produced by Laser Powder Bed Fusion for Mechanical Metamaterial Applications

Advanced Engineering Materials, EarlyView.
Stabilization of L‐PBF Ni50.7Ti49.3 under low‐cycle loading was investigated. Recoverable strain after cycling was dependent on the amount of applied load. Recovery ratio was 53.4% and 35.1% at intermediate and high load, respectively. The maximum total strain reached 10.3% at a high load of 1200 MPa.
Ondřej Červinek, Jakub Hurník, Miroslav Šmíd, Ondřej Zobač, Melanie Todt, Daniel Koutný   +5 more
wiley   +1 more source

Study of using three dimensional printer for EDM electrode fabrication [PDF]

, 2011
In this study, Cu-Al2O3 powder was prepared using ball mill and used separately for powder metallurgy (PM) and Three Dimensional Printer (3DP) application to fabricate electrode for electrical discharge machining (EDM).
Hassan, Noor Haslyena
core  

Low power radiometric partial discharge sensor using composite transistor-reset integrator [PDF]

, 2018
The measurement of partial discharge provides a means of monitoring insulation health in high-voltage equipment. Traditional partial discharge measurements require separate installation for each item of plant to physically connect sensors with specific ...
Atkinson, Robert C., Filho, Flávlo T., Glover, Ian A., Judd, Martin D., Lazaridis, Pavlos I., Mather, Peter J., Mistry, Keyur K., Saeed, Bakhtiar I., Sibley, Martin J. N., Tachtatzis, Christos, Upton, David W.   +10 more
core   +2 more sources

Influence of an Argon/Silane Atmosphere on the Temperature of a Thermal Plasma

Advanced Engineering Materials, EarlyView.
The influence of a silane‐doped argon atmosphere on the chemical composition and temperature of a thermal nontransferring argon plasma is investigated using optical emission spectroscopy. As a result of the high amount of free electrons resulting from the stepwise ionization and dissociation of the silane molecule, even a silane addition of 0.01 vol ...
Lena Kreie, David Kramer, Thomas Scheithauer, Hans Jürgen Maier, Thomas Hassel   +4 more
wiley   +1 more source

Evaluation of Uncertainty in Partial Discharge Measurement: A Case Study

IEEE Access
ISO/IEC 17025:2017 recommends all accredited laboratories under this standard, performing testing and calibration, shall identify and evaluate the contributions to the uncertainty of their measurements.
Asif Islam, Md Shafiullah, Amjad Ali, Md Shafiul Alam, Waleed Hamanah, Rabiul Alam   +5 more
doaj   +1 more source

Handbook of Establishing and Maintaining Oxygen‐Free Atmospheres

Advanced Engineering Materials, EarlyView.
This study presents a practical framework for creating oxygen‐free atmospheres at ambient pressure using silane‐doped inert gases. The results show that ultra‐low oxygen levels and strongly reduced water content can be achieved through controlled silane dosing, drying systems, and sensor monitoring.
Sascha Jan Zimmermann, René Gustus, Lienhard Wegewitz, Wolfgang Maus‐Friedrichs   +3 more
wiley   +1 more source

Kualiti pengalaman pembelajaran pelajar-pelajar kejuruteraan di KUiTTHO dari aspek kognitif dan afektif [PDF]

, 2004
Pembelajaran kognitif dan afektif merupakan pembelajaran yang perlu ditekankan dalam konteks pengajaran dan pembelajaran dalam pendidikan tinggi kejuruteraan.
Tuan Mat, Tuan Rozilaazawani
core