Results 111 to 120 of about 5,815,291 (292)

Analysis of the influence of operating modes of a dry transformer on the condition of its insulation

Известия высших учебных заведений: Проблемы энергетики
RELEVANCE Numerical simulation of the isolation modes of dry transformers is relevant due to the need to improve the reliability and efficiency of modern power systems, as it allows to optimize their operational characteristics.
R. N. Balobanov, V. M. Bulatova
doaj   +1 more source

Machine learning techniques for power transformer insulation diagnosis

, 2011
Power transformers are one of the most critical equipments in electricity network. A number of techniques such as dissolved gas analysis (DGA), polarization and depolarization currents (PDC) measurement and frequency domain spectroscopy (FDS) have been ...
Ekanayake, Chandima, Ma, Hui, Saha, Tapan   +2 more
core  

Unveiling Exsolution‐Induced Giant Electronic and Magnetic Property Changes in Non‐Stoichiometric Titanate Perovskite Thin Films

Advanced Materials, EarlyView.
A giant insulator to metal transition and emergent superparamagnetism are revealed by nanoparticle exsolution in non‐stoichiometric titanate perovskite thin films. By combining transport, synchrotron spectroscopy, and first‐principles calculations, this work reveals how defect reconfiguration and lattice reconstruction fundamentally reshape electronic ...
Sungil Kim, June Ho Lee, Yaolong Xing, Dongchang Kim, Haeseong Jeong, Mongjun Jeong, Manuel Valvidares, Stuart S. P. Parkin, Sang Ho Oh, Donghwa Lee, Hyojin Yoon, Hyeon Han   +11 more
wiley   +1 more source

Intelligent framework and techniques for power transformer insulation diagnosis

, 2009
This paper presents an on-going project of developing a suite of intelligent diagnostic tools for evaluating power transformer insulation systems. Our ultimate goal is to exploit techniques for automatically processing the measurement data, extracting ...
Ekanayake, C., Hui Ma, Ma, H, Thomas, A., Saha, T.K., Andrew Thomas, Chandima Ekanayake, Tapan K. Saha   +7 more
core   +1 more source

Phase Engineering of Nanomaterials (PEN): Evolution, Current Challenges, and Future Opportunities

Advanced Materials, EarlyView.
This review summarizes the synthesis, phase transition, advanced characterization spanning ex situ to in situ and operando techniques, and diverse applications of phase engineering of nanomaterials (PEN). It further outlines key challenges and future opportunities, such as phase stability, architecture control, and artificial intelligence (AI)‐driven ...
Ye Chen, Zhanxi Fan, Jingjie Ge, Qiyuan He, Zhuangchai Lai, Jiawei Liu, Chaoliang Tan, Hua Zhang   +7 more
wiley   +1 more source

Partial Discharge Characteristics of Typical Defects in Oil-Paper Insulation Based on Photon Detection Technology

Energies
As a key equipment in the power system, the insulation state of oil-immersed transformer is directly related to the safe and stable operation of the power grid.
Zhengyan Zhang, Yong Yi, Ji Qi, Qian Wang, Weiqi Qin, Xianhao Fan, Chuanyang Li   +6 more
doaj   +1 more source

Radiative Thermal Management for Extreme Environments: Mechanisms and Design Strategies

Advanced Materials, EarlyView.
In this review, we discuss the fundamental mechanisms of radiative cooling and solar heating, material and structural design strategies, hybrid approaches integrating additional heat transfer pathways, and durability‐oriented designs addressing environmental stresses.
Hyung Rae Kim, Haeseong Kim, Joo Hwan Ko, Gil Ju Lee, Dae‐Hyeong Kim, Young Min Song   +5 more
wiley   +1 more source

Feasibility Test Based on Insulation, Ratio and Internal Protection for 20 MVA Power Transformer of 150/20 kV Substation

Aviation Electronics, Information Technology, Telecommunications, Electricals, and Controls
The problems that occur in 20 MVA power transformers are insulation feasibility issues, voltage regulation and internal relay malfunctions. The impact is to cause a degradation of transformer reliability.
Fajar Bagus Ramadhan, Muhamad Haddin
doaj   +1 more source

Parity‐Dependent THz Harmonic Generation in Electrically Pumped Micro‐Lasers Exploiting Topological Insulator–Metamaterial Gratings

Advanced Materials, EarlyView.
Topological insulator–metamaterials integrated with electrically driven terahertz quantum cascade lasers enable parity‐dependent harmonic generation. Bulk‐dominated Bi2Se3 favors third‐harmonic emission at 9.96 THz, whereas topological‐surface‐state‐dominated Bi2Se3, Bi2Te3, and (Bi,Sb)2Te3 generate strong second harmonics near 6.5 THz.
Alessandra Di Gaspare, Craig S. Knox, Ahmet Yagmur, Sara Ghayeb Zamharir, Lianhe Li, Satoshi Sasaki, A. Giles Davies, Edmund H. Linfield, Joshua R. Freeman, Miriam S. Vitiello   +9 more
wiley   +1 more source

Research on the variation of dielectric properties of oil‐paper insulation for power equipment over a wide temperature range

High Voltage
The main part of oil‐immersed power equipment is oil‐paper insulation. At lower ambient temperatures, transformer oil will become viscous. As a result, compared to those at room temperature or operating temperature, the frequency domain dielectric ...
Mingze Zhang, Muhe Yu, Wen Zhou, Yilin Liang, Shengjie Lei, Yunbo Shi, Limin Qu   +6 more
doaj   +1 more source