Results 41 to 50 of about 140 (122)

Use of Alternating Current Spinning to Prepare Carbon Nanofibers From Commercial PAN Fibers

Journal of Applied Polymer Science, Volume 142, Issue 31, August 15, 2025.
ABSTRACT The aim of this study was to explore the potential of recycling commercial polyacrylonitrile fibers through electrospinning to produce carbon nanofibers (CNFs). We evaluated the feasibility of producing bulk nanofiber layers from recycled polymer and optimized the process to achieve an optimal solution concentration (10 wt%).
Radek Jirkovec, Michal Holada, Pavel Holec, Jiri Chvojka   +3 more
wiley   +1 more source

Bridgeless Boost Pfc Converter Using The Three-state Switching Cell

Eletrônica de Potência, 2012
This paper introduces a bridgeless boost converter based on the three-state switching cell for PFC (power factor correction) applications, whose distinct advantages are reduced conduction losses with the use of magnetic elements with minimized size ...
Falcondes José Mendes de Seixas, Juan Paulo Robles Balestero, Claudiner Mendes de Seixas, Fernando Lessa Tofoli, Grover Victor Torrico Bascopé   +4 more
doaj   +1 more source

Geomagnetically Induced Currents, Transformer Harmonics, and Reactive Power Impacts of the Gannon Storm in May 2024

Space Weather, Volume 23, Issue 4, April 2025.
Abstract Geomagnetically induced current (GIC) measurements made at two 3 phase, 3 limb transformers, operating in the Halfway Bush substation in Dunedin, New Zealand have been analyzed during the May 2024 Gannon Storm. GIC measurements were combined with very low frequency radio wave AC harmonic measurements made nearby, and reactive power ...
M. A. Clilverd, C. J. Rodger, D. H. Mac Manus, J. B. Brundell, M. Dalzell, A. Renton, V. Lo, A. Lapthorn, A. W. Smith, J. Malone‐Leigh, X. Feng, T. Petersen   +11 more
wiley   +1 more source

About loading of autotransformers in main electrical grids and conclusions for designing

E3S Web of Conferences, 2017
The justification issues and the capacity selection of autotransformers in the main electrical grids, which require the accounting of the operation regimes of power units for the future of 10 or more years are considered.
Vasilenko Nikita, Plotnikov Vladislav, Shuntov Andrey   +2 more
doaj   +1 more source

Calculation of Transformer and Autotransformer Resources in Automatic Control Systems of Technological Processes at Substations

Известия высших учебных заведений и энергетических объединенний СНГ: Энергетика, 2009
The paper proposes algorithms for calculation of transformer and autotransformer resources and control of thermal condition of windings using hardware and software of automatic control systems of technological processes at substations.The given software ...
V. V. Bourliuk, S. N. Zherko
doaj   +1 more source

A Modular Multi‐Port Hybrid Solid‐State Transformer for Large‐Scale Renewable Power Applications

IET Electric Power Applications, Volume 19, Issue 1, January/December 2025.
This article proposes a four‐port solid‐state transformer (FPSST) to enhance large‐scale energy generation from renewable sources. The FPSST incorporates a modular multilevel converter to collect both medium‐voltage ac and medium voltage dc from wind and solar systems.
Md. Sanwar Hossain, Md. Rabiul Islam, Danny Sutanto, Kashem M. Muttaqi   +3 more
wiley   +1 more source

No Load Simulation and Downscaled Experiment of UHV Single-Phase Autotransformer Under DC Bias

IEEE Access, 2020
The time-domain field-circuit coupled finite element method (FEM) is widely used to analyze the DC effects on transformers. However, the long transient process of calculation will encounter difficulties due to the tremendous requirement of computer ...
Bing Li, Zezhong Wang, Suxin Guo, Mingyang Li   +3 more
doaj   +1 more source

Influence of Short‐Circuit Current Nonperiodic Component Increasing on Radial Dynamic Stability of Power Transformer Winding Under Reclosing

IET Electric Power Applications, Volume 19, Issue 1, January/December 2025.
This study examines the impact of reclosing on the radial dynamic stability of transformer windings, revealing that the reclosing short‐circuit current and associated electromagnetic forces significantly increase compared to initial short‐circuit conditions.
Yuefeng Hao, Jun Liu, Xiaoli Zhang, Weiwei Zhang   +3 more
wiley   +1 more source

Electromagnetic processes in traction supply system of 2×25 kV with catenary supports disconnected from the railway track

Вестник Научно-исследовательского института железнодорожного транспорта, 2016
The article explains the possibility of refusal of application of catenary supports of railway track for grounding and use an artificial grounding conductor for this purpose.
A. B. Kosarev
doaj  

Wavelet analysis of geomagnetically induced currents during the strong geomagnetic storms

Russian Journal of Earth Sciences, 2022
The main problem of electric utilities around the world is to ensure continuous power supply to consumers. One of the causes of power outages and blackouts can be geomagnetic storms during periods of the increased solar activity.
Aksenovich Tatyana, Bilin Vladislav, Sakharov Yaroslav, Selivanov Vasiliy   +3 more
doaj   +1 more source