Results 51 to 60 of about 11,630 (246)

Dissolved Gas Generation Characteristics of Dielectric Liquids Under Partial Discharges and Breakdown Sparks

High Voltage, EarlyView.
ABSTRACT With the growing interest in monitoring and diagnostic techniques for assessing transformer condition, dissolved gas analysis (DGA) stands out as a crucial diagnostic tool to detect electrical and thermal faults in liquid‐immersed transformers.
Gechen Bian, Qiang Liu, Paul Jarman, Pascal Mavrommatis   +3 more
wiley   +1 more source

Transformers Health Index Assessment Based on Neural-Fuzzy Network

Energies, 2018
In this paper, an assessment on the health index (HI) of transformers is carried out based on Neural-Fuzzy (NF) method. In-service condition assessment data, such as dissolved gases, furans, AC breakdown voltage (ACBDV), moisture, acidity, dissipation ...
Emran Jawad Kadim, Norhafiz Azis, Jasronita Jasni, Siti Anom Ahmad, Mohd Aizam Talib   +4 more
doaj   +1 more source

Surface Flashover in 50 Years: III. Extreme Environments and Industrial Challenges

High Voltage, EarlyView.
ABSTRACT Modern high‐voltage electrical equipment operates in complex environments where surface conditions are subjected to multifaceted influences from electric fields, thermal gradients, contaminants, irradiation and other extreme environmental factors.
Zhen Li, Heng Zhang, He Gao, Ji Liu, Yoshimichi Ohki, George Chen, Shengtao Li   +6 more
wiley   +1 more source

Application and Analysis for Surge Arrester on Lightning Protection of Distribution Network

MATEC Web of Conferences, 2015
In order to effectively reduce lightning stroke outage rate, effect of lightning protection with surge arrester on transmission line has been generally acknowledged relative to other lightning protection measures.
Wang Daxing, He Bin, Zhong Wei, Lin Bo, Wang Dong, Li Tingbin   +5 more
doaj   +1 more source

Estimation of Transformers Health Index Based on the Markov Chain

Energies, 2017
This paper presents a study on the application of the Markov Model (MM) to determine the transformer population states based on Health Index (HI). In total, 3195 oil samples from 373 transformers ranging in age from 1 to 25 years were analyzed.
Muhammad Sharil Yahaya, Norhafiz Azis, Mohd Zainal Abidin Ab Kadir, Jasronita Jasni, Mohd Hendra Hairi, Mohd Aizam Talib   +5 more
doaj   +1 more source

Differences in M‐components between triggered lightning striking the ground and overhead line

High Voltage
In the summer of 2018–2019, rocket‐triggered lightning experiments were conducted in Guangzhou, China. There were two types of lightning targets: ground and overhead line.
Li Cai, Yiyang Du, Wenchao Fan, Mi Zhou, Jianguo Wang, Jinxin Cao, Yadong Fan   +6 more
doaj   +1 more source

Mapping the density of giant trees in the Amazon. [PDF]

New Phytol
Summary Tall trees (height ≥ 60 m) are keystone elements of tropical forests, strongly influencing biodiversity, carbon storage, and ecosystem resilience. Yet, their density and spatial distribution remain poorly quantified, especially in remote Amazonian regions, limiting our understanding of their ecological roles and contribution to forest–climate ...
de Lima RB, da Silva DAS, Nunes MH, Bittencourt PRL, Groenendyk P, de Oliveira CP, Granato-Souza D, Caraciolo Ferreira RL, Aleixo da Silva JA, Aguirre-Gutiérrez J, Jackson T, de Matos Filho JR, Aparício PDS, da Silva JPG, de Toledo JJ, Guedes MC, de Almeida DRA, Higuchi N, Wagner FH, Ometto JP, Görgens EB.   +20 more
europepmc   +2 more sources

Observation of an upward lightning flash with 21 upward positive leaders initiated from different wind turbines in wind farm

High Voltage
As the wind turbine height increases, the probability of multiple upward leaders flashes within the wind farm increases. In this study, an upward lightning flash containing 21 upward positive leaders (UPLs) initiated from different wind turbines in ...
Li Cai, Yifeng Ke, Wenchao Fan, Ruisheng Yan, Mi Zhou, Jianguo Wang, Yadong Fan   +6 more
doaj   +1 more source

DNA‐Methylation for Risk‐Stratification of Women Without a Fully Visible Transformation Zone at Colposcopy: A Cross‐Sectional Study

BJOG: An International Journal of Obstetrics &Gynaecology, EarlyView.
ABSTRACT Objective To evaluate the performance of DNA methylation markers for the detection of cervical precancer among screening‐positive older women without a fully visible transformation zone at colposcopy (TZ3). Design Cross‐sectional study. Setting Colposcopy clinics, Central Denmark Region, 2019–2021.
Karen Omann Binderup, Joachim Boers, Line Winther Gustafson, Berit Andersen, Lone Kjeld Petersen, Pinar Bor, Joost Gribnau, Wim G. V. Quint, Henk Van Den Munckhof, Mette Tranberg, Anne Hammer   +10 more
wiley   +1 more source

Wildfires and Atopic Diseases: A Review

Allergy, EarlyView.
ABSTRACT Wildfire smoke is a major environmental health threat that has increased in frequency and severity in recent years. A hazardous component of wildfire smoke is particulate matter ≤ 2.5 μm (PM2.5). There is evidence to suggest that exposure to wildfire PM2.5 may increase the risk of developing or exacerbating atopic diseases, such as asthma ...
Alex Ha, John R. Balmes, Maria L. Wei
wiley   +1 more source