Results 91 to 100 of about 12,784 (263)

Comparison of Dielectric Recovery After Arc Burning in SF6 Gas and Its Potential Alternatives

High Voltage, EarlyView.
ABSTRACT Although sulphur hexafluoride (SF6) exhibits exceptional insulating properties, it is a potent greenhouse gas. Therefore, studying alternatives to SF6 is critical for developing environmentally friendly high‐voltage electrical equipment.
Ziqi Liu, Hao Sun, Yi Wu, Mingzhe Rong, Zeyuan Luo   +4 more
wiley   +1 more source

Protection of electronic equipment inside buildings: a hidden source of damages

, 2021
This paper shows that the criteria for the installation of surge protective devices (SPD) in power distribution panels as prescribed in standards on lightning protection and on low-voltage electrical installations may not prevent damages of sensitive ...
Silva, J. C. O., Alves, N. V. B., Pissolato Filho, J., Barbosa, C. F., Panicali, A. R.   +4 more
core   +1 more source

Rare Lightning and Convection Characteristics During Two Successive Tornadoes in Southern China

High Voltage, EarlyView.
ABSTRACT Systematic investigations into lightning characteristics of tornado storms in China remain scarce. This study comprehensively analyses rare lightning behaviour and overshooting top characteristics for two successive tornadoes during a long‐lived supercell in southern China on 27 April 2024.
Fengquan Li, Jiangling Zhi, Yu Wang, Hantao Tao, Zhaoming Li, Shanqiang Gu, Zhe Li, Zeyu Zhang, Lei Zhang, Guoying Tang   +9 more
wiley   +1 more source

The 2018 revision of the standard IEC 61400-24 : lightning protection of wind turbines [PDF]

, 2018
The first edition of the standard IEC 61400-24, Wind Generator Systems-Part 24 Lightning Protection, was issued in June 2010, and the scope was to reflect the experiences and technical understanding of lightning protection of wind turbines by ...
Mendez, Y., Birkl, J., Madsen, S., Montañá Puig, Juan   +3 more
core   +1 more source

EMC considerations for JLRL direct lightning current measurement

, 2022
In this paper the electromagnetic compatibility (EMC) considerations made to the direct lightning current measuring system that is part of the Johannesburg Lightning Research Laboratory (JLRL) are presented.
Saba, Marcelo M. F.,, Becerra Garcia, Marley,, Schumann, Carina,, Hunt, Hugh G. P.,, de Oliveira e Silva, Jose Claudio,   +4 more
core   +1 more source

Mechanism of Quasi‐Power‐Frequency Resonant Overvoltage Triggered by Multiple Lightning Strikes in High‐Voltage Alternating Current Systems Equipped With Shunt Reactor

High Voltage, EarlyView.
ABSTRACT This paper investigates the generation mechanism of quasi‐power‐frequency resonant overvoltage triggered by multiple lightning strikes in high‐voltage alternating current (HVAC) systems equipped with shunt reactors. Based on field measurements from a 500 kV AC system, equivalent and simplified circuit models have been established to analyse ...
Tao Liang, Tao Cui, Zhengxi Wang, Tongwei Guo, Xiaohui Wu, Hong Zeng, Jie Guo, Yanzhao Xie   +7 more
wiley   +1 more source

Comprehensive Design and Experimental Validation of 30 kV Ultra‐Fast Flexible Controllable Arresters for HVDC Systems

High Voltage, EarlyView.
ABSTRACT To effectively suppress transient overvoltages in HVDC systems, the design and experimental validation of a multi‐module series controllable arrester are presented. The voltage‐limiting performance, series voltage equalisation capability, and robustness under fault conditions in high‐voltage scenarios require further research.
Tai Yang, Xiangyu Zhang, Sihang Wu, Lei Qi, Xiang Cui   +4 more
wiley   +1 more source

Distribution of charge along the tower and lightning channel when lightning strikes a tall tower

, 2012
We derive expressions to calculate the charge density along the tower and lightning channel based on the assumptions of the transmission line model of the lightning strikes to a tall tower and a series point current source placed at the tower top.
Zhou, Helin,, Gerhard Diendorfer, Helin Zhou, Diendorfer, Gerhard, Rajeev Thottappillil, Thottappillil, Rajeev,   +5 more
core   +1 more source

Application Status and Development Trends of DC Ice‐Melting Devices in China's Power Grid

IET Smart Energy Systems, EarlyView.
This paper summarises the development history and engineering application status of DC ice‐melting devices (DCIMD) in China, analyses the principles, advantages, disadvantages and adaptability of mainstream topologies and discusses the key problems and corresponding improvement directions.
Ming Lei, Tianlong Zhang, Zhenglin Li, Jian Wang, Tao Zhang, Peng Wang, Ruiqi Zhan   +6 more
wiley   +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