Results 51 to 60 of about 2,386,087 (130)

基于经验傅里叶分解的混合式高压直流断路器耗能支路故障检测方法研究 [PDF]

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为实现更强的能量耗散能力，混合式高压直流断路器的耗能支路需串并联大量金属氧化物压敏电阻（metal oxide varistor，MOV），耗能支路的可靠性将直接影响混合式高压直流断路器的可靠性。但是，现有的耗能支路故障检测方法并不能适应整个能量耗散阶段。为此，提出一种基于经验傅里叶分解的混合式高压直流断路器耗能支路故障检测方法，具体为：首先是信号预处理，对耗能支路每个子模块的分支电流进行归一化和一阶差分计算来获取分析电流；然后是故障特征提取，利用经验傅里叶分解（empirical Fourier ...
彭兆伟, 宋鹏, 高杰, 黄诗洋, 杨爱军, 徐党国   +5 more
doaj   +1 more source

A novel thyristor‐based hybrid DC circuit breaker with short arcing capability

High Voltage, Volume 9, Issue 6, Page 1288-1301, December 2024.
Abstract Multi‐terminal flexible high‐voltage direct current (HVDC) transmission and DC grid technology are developing rapidly. The hybrid DC circuit breaker (HCB) has broad application prospects in the field of HVDC transmission and DC power grid. Nevertheless, existing HCBs have one or more following blemishes: arc suppression scheme of mechanical ...
Guanlong Jia, Yuchen Yuan, Hongjiang Guo, Xiaoxue Wang, Feng Niu   +4 more
wiley   +1 more source

Detection of failures in HV surge arrester using chaos pattern with deep learning neural network

IET Science, Measurement &Technology, Volume 18, Issue 9, Page 603-615, November 2024.
This paper proposes a fault diagnosis method for HV surge arresters based on the chaotic system and CNN. Compared to AlexNet, HOG+BPNN, HOG+SVM, HOG+DT, and HOG+KNN detection methods, the accuracy of the method proposed in this paper is 97%. Abstract As a protective component of HV equipment, the primary function of a surge arrester is to mitigate the ...
Chun‐Chun Hung, Meng‐Hui Wang, Shiue‐Der Lu, Cheng‐Chien Kuo   +3 more
wiley   +1 more source

Biomedical applications of metal oxide–carbon composites

, 2022
The synthesis and characterization of metal oxides have received substantial attention from researchers because of their wide-ranging applications in various fields, particularly in the biomedical area, resulting from their magnificent properties.
Ammar Z. Alshemary, Evis, Z., Zafer Evis, Motameni, A., Ali Motameni, Alshemary, A.Z.   +5 more
core   +1 more source

Novel dual‐resonance damped alternating current testing system for offline partial discharge measurement of power cables

IET Generation, Transmission &Distribution, Volume 18, Issue 14, Page 2397-2405, July 2024.
The damped alternating current (DAC) testing system has emerged as an effective tool for inducing partial discharge (PD) events. This research contributes to the development of more efficient and affordable DAC generation technology for power cable testing applications.
Li Wang, Lei Jin, Junbai Chen, Hongjie Li   +3 more
wiley   +1 more source

Research of simulation and experiment on arc characteristics of gas mechanical switch

High Voltage, Volume 9, Issue 3, Page 626-635, June 2024.
Abstract An arc is the high‐temperature discharge plasma produced in the opening process of mechanical switches, which directly affects the breaking capability of a hybrid DC circuit breaker. According to the physical mechanism of an electric arc, the construction of an arc model for simulation analysis is an important technical means in the electrical
Cheng Jiang, Lu Qu, Zhangqing Yu, Zhizheng Gan, Xin yan, Rong Zeng, Yulong Huang, Shaofu Li   +7 more
wiley   +1 more source

Metaheuristic‐based graded objective function strategy for optimal thyristor‐controlled series capacitors estimation in weak distribution systems with uncertain distributed generation

IET Generation, Transmission &Distribution, Volume 18, Issue 7, Page 1325-1342, April 2024.
This study proposes an optimal approach to improve the quality of a weak electrical power distribution system using thyristor‐controlled series capacitors (TCSC). The approach considers components like shunt capacitors and distributed generators, which are influenced by weather conditions.
Mohamed Abd‐El‐Hakeem Mohamed, Salah Kamel, Fendzi Mbasso Wulfran   +2 more
wiley   +1 more source

The study of voltage-current characteristic of lightning impulse to the metal-oxide varistor

, 2011
Access is limited to UniMAP community.This project studies the voltage-current (V-I) characteristic of lightning impulse to the metal-oxide varistor (MOV). MOV is widely used in the low voltage equipment for protection from lightning surge.
Lim, Hooi Hoon
core  

Behavioral studies of surge protection devices based on traditional metal oxide varistor / gas discharge tube and power electronics switches [PDF]

, 2022
The source of this power surge can be classified into internal and external source of surge. Lightning is the most obvious source of surge which can lead to degrade or severe physical damage to electrical device in the circuit.
Teh, Jia Kee
core  

Simulation Analysis of DC Fault Interruption Characteristics of Superconducting Electric Aircraft Propulsion

CSEE Journal of Power and Energy Systems
Environmental issues associated with the aviation industry are getting more attention as air traffic increases. Stringent standards are imposed for fuel consumption and pollution emissions for next-generation aircraft.
Muhammad Junaid, Xiaolong Yu, Shuzhi Cao, Wenqing Yu, Dongsheng Zuo, Jianhua Wang   +5 more
doaj   +1 more source