Results 111 to 120 of about 4,160 (293)

Investigating the Sensitivity of Frequency Response Analysis on Transformer Winding Structure

, 2014
This paper investigates the sensitivity of frequency response analysis (FRA) on the structure of transformer winding. Frequency response of a winding is simulated using the multi-conductor transmission line (MTL) model based on the winding parameter ...
Yousof, M. F. M., Ekanayake, Chandima, Yousof, M.F.M., Saha, T. K., Ekanayake, C., Saha, Tapan, M. F. M. Yousof, T. K. Saha, C. Ekanayake   +8 more
core   +1 more source

Low‐Angle Grain Boundaries and Re‐Segregation in Single‐Crystalline Ni‐Base Superalloys

Advanced Engineering Materials, EarlyView.
This work demonstrates that Re‐segregation at low‐angle grain boundaries (LAGBs) in Ni‐base superalloys is influenced by misorientation angle. Advanced microscopy and atom probe tomography reveal that higher misorientation angles increases Re‐segregation.
Alireza B. Parsa, Aparna Saksena, Alesander Kostka, Pascal Thome, Felicitas Scholz, Alexandre Mussi, Christoph Somsen, Baptiste Gault, Jan Frenzel, Gunther Eggeler   +9 more
wiley   +1 more source

Winding vacuum energies in a deformed O(4) sigma model

Nuclear Physics B, 2014
We consider the problem of calculating the Casimir energies in the winding sectors of Fateev's SS-model, which is an integrable two-parameter deformation of the O(4) non-linear sigma model in two dimensions.
Vladimir V. Bazhanov, Gleb A. Kotousov, Sergei L. Lukyanov   +2 more
doaj   +1 more source

Productivity‐Driven Optimization of Laser Powder Bed Fusion Parameters for IN718 Superalloy: Process Control, Microstructure, and Mechanical Properties

Advanced Engineering Materials, EarlyView.
This study demonstrates how optimizing laser power, scanning speed, and hatching distance in laser powder bed fusion can boost the productivity of Inconel 718 manufacturing by up to 29% while maintaining mechanical integrity. The work delivers a validated process window and cost–time analysis, offering industry‐ready guidelines for efficient additive ...
Amir Behjat, Guido Barale, John Stavridis, Ehsan Norouzi, Jin‐Yoo Suh, Dong‐Ik Kim, Luca Iuliano, Abdollah Saboori   +7 more
wiley   +1 more source

The occurrence and mechanism of hysteresis between axial deformation and short‐circuit electromagnetic force during the vibration of power transformer windings

IET Electric Power Applications
Mechanical stability is one of the core capabilities of power transformers. External short‐circuit accidents are the main cause of winding instability. International Electrotechnical Commission 60076‐5 standard recommends a method to calculate the short ...
Mingkai Jin, Weijie Xu, Weijiang Chen, Qiaogen Zhang, Yi Zhao, Tao Wen   +5 more
doaj   +1 more source

On the Feasibility of Localizing Transformer Winding Deformations Using Optical Sensing and Machine Learning

Photonics
Mechanical vibrations induced by electromagnetic forces during transformer operation can lead to winding deformation or failure, an issue responsible for over 12% of all transformer faults.
Najmeh Seifaddini, Meysam Beheshti Asl, Sekongo Bekibenan, Simplice Akre, Issouf Fofana, Mohand Ouhrouche, Abdellah Chehri   +6 more
doaj   +1 more source

Diagnostics of Winding Deformation in a Single-Phase Power Transformer with an Unloaded Tertiary Winding in Operational Mode

, 2018
The presented paper is focused on the development of an algorithm and software implementation of this algorithm into diagnostics of winding deformation in a single-phase power transformer with an unloaded tertiary winding in operational mode.
Andrey Krivunev, Sergey Dorozhko
core   +1 more source

Pyramidal Structures on Yttria‐Stabilized Zirconia after High Temperature Exposure at 1500°C: New Features on an Old Material

Advanced Engineering Materials, EarlyView.
New features on yttria‐stabilized zirconia after exposure at 1500°C: Newly discovered pyramidal structures on an old material. After exposure at 1550°C on the cross section of YSZ new features, namely pyramidal structures are discovered. These structures grow with time, increase in numbers, appear as singularities, are often arranged in strings, and ...
Doris Sebold, Dylan Jennings, Robert Vaßen   +2 more
wiley   +1 more source

A New Multi-Conductor Transmission Line Model of Transformer Winding for Frequency Response Analysis Considering the Frequency-Dependent Property of the Lamination Core

Energies, 2018
Multi-conductor transmission line (MTL) model of power transformer winding for frequency response analysis (FRA) has been successfully applied for the purpose of studying the characteristics of winding deformations. Most of the time it is considered that,
Song Wang, Ze Guo, Ting Zhu, Hanke Feng, Shuhong Wang   +4 more
doaj   +1 more source

An Experimental Study of the Sweep Frequency Impedance Method on the Winding Deformation of an Onsite Power Transformer

, 2020
Power transformers are one of the most important devices in electrical networks. The safety operation of the transformers directly affects the reliability of the power system. To diagnose the internal deformation of the transformer as soon as possible is
Song Wang, Jie Long, Ying Cui, Shuang Wang, Fuqiang Ren, Shengchang Ji, Shuhong Wang   +6 more
core   +1 more source