Results 21 to 30 of about 140 (122)

Frequency Diagnostics of Insulating System of Power Transformers

Electrical, Control and Communication Engineering, 2020
The paper presents experimental diagnostics of the oil-paper insulating system of power transformers using progressive frequency method. The first part of the paper deals with the basic information about diagnostics of power oil transformers.
Gutten Miroslav, Korenciak Daniel, Brncal Peter, Jarina Roman   +3 more
doaj   +1 more source

Comparative Analysis of 18-Pulse Autotransformer Rectifier Unit Topologies with Intrinsic Harmonic Current Cancellation

Energies, 2018
With the evolution of the More Electric Aircraft (MEA) concept, high pulse converters have gained the attention of researchers due to their higher power quality.
Shahbaz Khan, Xiaobin Zhang, Muhammad Saad, Husan Ali, Bakht Muhammad Khan, Haider Zaman   +5 more
doaj   +1 more source

High Voltage DC Active Current Injection to Simulate Geomagnetically Induced Currents in New Zealand

Space Weather, Volume 24, Issue 3, March 2026.
Abstract This study investigates the effects of geomagnetically induced currents (GIC) on New Zealand's electrical infrastructure via an intentional ground injection of direct current (DC) from a high voltage DC converter station. GIC manifests as quasi‐DC currents within power systems, potentially causing transformer saturation, increased reactive ...
Soren Subritzky, Andrew Lapthorn, Stewart Hardie, Paul Agger, Mike Dalzell, Mark A. Clilverd, Neil Cobbett, Ciaran Beggan, Juliane Hübert, Eliot Eaton, James B. Brundell, Craig J. Rodger   +11 more
wiley   +1 more source

Harmonic Mitigation in Multi-Pulse Rectification: A Comparative Study of 12-, 18-, and 24-Pulse Systems

Mathematics
In the evolution of the modern “More Electric Aircrafts” (MEAs) concept, higher-pulse rectification systems using differential fork autotransformers play a pivotal role.
Hani Albalawi, Abdul Wadood, Shahbaz Khan, Aadel Mohammed Alatwi   +3 more
doaj   +1 more source

A Novel Ground Fault Identification Method for 2 × 5 kV Railway Power Supply Systems

Energies, 2015
The location of ground faults in railway electric lines in 2 × 5 kV railway power supply systems is a difficult task. In both 1 × 25 kV and transmission power systems it is common practice to use distance protection relays to clear ground faults and ...
Jesus Serrano, Carlos A. Platero, Maximo López-Toledo, Ricardo Granizo   +3 more
doaj   +1 more source

Antimicrobial Functionalization of Composite Nanofibrous Yarns as Surgical Sutures

Macromolecular Bioscience, Volume 26, Issue 2, February 2026.
This study presents the fabrication of drug‐loaded nanofibrous yarns using alternating current electrospinning. Incorporating chlorhexidine into a polycaprolactone envelope around a polyamide 6 core, the yarns offer extended antimicrobial release and promote cell adhesion.
Věra Hedvičáková, Manikandan Sivan, Divyabharathi Madheswaran, Kristýna Havlíčková, Šárka Hauzerová, Maxim Lisnenko, Jan Valtera, Jaroslav Mikule, Kateřina Strnadová, Věra Jenčová, Eva Kuželová Košťáková, David Lukáš   +11 more
wiley   +1 more source

The New Geomagnetic Monitoring Network in China: Insights From the 2024 Mother's Day Superstorm

Space Weather, Volume 24, Issue 2, February 2026.
Abstract China has established a ground‐based network system, that is the Chinese Meridian Project (CMP), to continuously monitor the geomagnetic field. The superstorm in May 2024 was analyzed using the CMP data. The negative peak of the horizontal geomagnetic field (Bh) during the storm main phase at different CMP stations varied between −449 nT and ...
Jing Wang, Yue Yan, Bingxian Luo, Chunming Liu, Hui Li, Jiaojiao Zhang, Yanhong Chen, Chen Wu, Zihan Wu, Ziqian Liu, Xin Wang, Ercha Aa, Xianzhi Ao   +12 more
wiley   +1 more source

A Hybrid Ultra‐High Voltage DC Transformer With Digital Twin‐Driven Operation and Control

Digital Twins and Applications, Volume 3, Issue 1, January/December 2026.
This study introduces a digital twin‐driven hybrid ultra‐high‐voltage DC transformer (UHVDCT) that combines high‐capacity LCCs with low‐capacity MMCs at the UHV side. This innovative topology reduces MMC requirements by 32.9% while ensuring stable power flow and dynamic reactive balance through real‐time virtual‐physical synchronization.
Ling Xu, Le Zhao, Xiaohu Zhang, Hanlin Guo, Jie Fang, Zheren Zhang, Zheng Xu   +6 more
wiley   +1 more source

Voltage Control Strategies in Distribution Systems With High Distributed Generation Penetration: Models, Methods and Future Research

IET Energy Systems Integration, Volume 8, Issue 1, January/December 2026.
ABSTRACT This paper presents a comprehensive review of recent global research on voltage control in distribution systems with high penetration of distributed generation. First, it examines voltage regulation challenges in distribution systems that integrate distributed generation.
Htutzaw Hein, Jiebei Zhu, Lujie Yu, Zequn Liu, Xiaolong Liu, Siyang Xu, Yi Hao   +6 more
wiley   +1 more source

Study of Special Unbalanced Load Modes of New Double-Autotransformer of the Flexible Alternating Current Link [PDF]

Problems of the Regional Energetics
The purpose of the work is study of special asymmetric modes of new three-phase autotrans-former device for flexible connection of alternative current power systems.
Bosneaga V., Suslov V.
doaj   +1 more source