Results 21 to 30 of about 620 (264)

A Novel High-Frequency Voltage Standing-Wave Ratio-Based Grounding Electrode Line Fault Supervision in Ultra-High Voltage DC Transmission Systems

Energies, 2017
In order to improve the fault monitoring performance of grounding electrode lines in ultra-high voltage DC (UHVDC) transmission systems, a novel fault monitoring approach based on the high-frequency voltage standing-wave ratio (VSWR) is proposed in this ...
Yufei Teng, Xiaopeng Li, Qi Huang, Yifei Wang, Shi Jing, Zhenchao Jiang, Wei Zhen   +6 more
doaj   +1 more source

Analysis of fault current and overvoltage at the neutral point of ±800 kV High-Voltage DC converter transformer

Energy Reports, 2022
In order to enhance the security of ±800 kV High-Voltage DC (HVDC) system, it is needed to consider and analyze the grounding mode of the neutral point of converter transformer.
Jiaqing Fu, Yang Han, Ping Yang, Congling Wang, Amr S. Zalhaf   +4 more
doaj   +1 more source

Detection of Irregular Sheath Current Distribution for Diagnosis of Faults in Grounding Systems of Cross-Bonded Cables

IEEE Access, 2023
Sheath currents in high voltage cable circuits have proven to be one of the most convenient indicators for assessing cable health. The sheath currents are regularly distributed with fluctuation in a certain range under normal conditions, while the ...
Gen Li, Jie Chen, Hongze Li, Libin Hu, Wenjun Zhou, Chengke Zhou   +5 more
doaj   +1 more source

Refined Diagnosis Method for Disconnected High-Resistance Grounding Faults in Medium-Voltage Distribution Lines

Zhongguo dianli
Multiple voltage drops or abnormal currents may occur in the power system, resulting in significant deformation and fluctuation of fault signal characteristics related to the medium voltage DC distribution network, exceeding the normal fluctuation range,
Peng ZHENG, Pengcheng HAN, Guodong WANG, Ying LOU   +3 more
doaj   +1 more source

A fault line selection method of small current grounding system based on wavelet packet and Bayes theory

Gong-kuang zidonghua, 2014
In view of problems of complex fault situation and unobvious characteristics of fault signal of fault line selection method of existing small current grounding system, a fault line selection method of small current grounding system based on wavelet ...
WANG Xiaowei, GAO Jie, WEI Xiangxiang, HOU Yaxiao   +3 more
doaj   +1 more source

Fault Handling and Localization Strategy Based on Waveform Characteristics Recognition with Coordination of Peterson Coil and Resistance Grounding Method

Energies
To address challenges in locating high-impedance grounding faults (HIGFs) and isolating fault areas in resonant grounding systems, this paper proposes a novel fault identification method based on coordinating a Peterson coil and a resistance grounding ...
Zhengyang Li, Yijia Cao, Chun Chen, Yansha Li, Jinglu Li   +4 more
doaj   +1 more source

Characteristics of the Flexible Graphite Grounding Material and its Engineering Application

IEEE Access, 2019
In order to meet the requirements of corrosion resistance of the grounding material and thermal stability of the grounding material of the transmission line towers, under the condition of power frequency current and high-frequency lightning current ...
Daochun Huang, Jun Xia, Jiangjun Ruan, Yongcong Wu, Wanlin Quan   +4 more
doaj   +1 more source

Principle of Flexible Ground-Fault Arc Suppression Device Based on Zero-Sequence Voltage Regulation

IEEE Access, 2021
Single-line-to-ground (SLG) fault arcs cause the intermittent over-voltages, leading to short circuits within large-scale area. In this paper, a flexible arc suppression device is proposed, which adopts a zigzag grounding transformer, multi-terminal ...
Bishuang Fan, Ganzhou Yao, Kun Yu, Xiangjun Zeng, Wen Wang, Chao Zhuo, Josep M. Guerrero   +6 more
doaj   +1 more source

Unraveling the Molecular Mechanisms of Glioma Recurrence: A Study Integrating Single‐Cell and Spatial Transcriptomics

Annals of Clinical and Translational Neurology, EarlyView.
ABSTRACT Objective Glioma recurrence severely impacts patient prognosis, with current treatments showing limited efficacy. Traditional methods struggle to analyze recurrence mechanisms due to challenges in assessing tumor heterogeneity, spatial dynamics, and gene networks.
Lei Qiu, Yinjiao Fei, Jiaxuan Ding, Kexin Shi, Jinyan Luo, Yuchen Zhu, Xingjian Sun, Gefei Jiang, Yuandong Cao, Weilin Xu, Shu Zhou   +10 more
wiley   +1 more source

A fault line selection method for flexible grounding systems based on zero-sequence current phase variation

Zhejiang dianli
To address the poor tolerance to transitional resistance and incomplete utilization of fault information in grounding protection for flexible grounding systems， a fault line selection method based on current phase variation is proposed.
LI Zong, WANG Deqiang, FENG Liang, SONG Jianguo, GAO Weiyuan, YUAN Pengsheng   +5 more
doaj   +1 more source