Results 71 to 80 of about 2,074 (217)

UHF diagnostic monitoring techniques for power transformers [PDF]

, 2004
This paper initially gives an introduction to ultra-high frequency (UHF) partial discharge monitoring techniques and their application to gas insulated substations.
Bennoch, C.J., Hunter, Ian, B.B., Judd, M.D., Yang, L.   +3 more
core  

Detection of Transient Decomposition Products of CF3SO2F and C4F7N via OES Under Spark and Glow Discharges

High Voltage, Volume 10, Issue 6, Page 1582-1592, December 2025.
ABSTRACT The optical emission spectra (OES) reflect the presence of excited states in the gaseous discharge, which are directly linked to the decomposition characteristics of insulating gases. In this study, a pin/rod–plate discharge reactor driven by either a high‐voltage direct current (DC) generator or a pulsed generator was developed to establish ...
Chenxi Man, Jincong Wang, Keli Gao, Yiheng Li, Yumin Zhang, Xuekai Pei   +5 more
wiley   +1 more source

Partial Discharge Detection Method of Fibre‐Composed HVDC Submarine Cable Based on φ‐OTDR and Hilbert Demodulation

High Voltage, Volume 10, Issue 6, Page 1380-1389, December 2025.
ABSTRACT Partial discharge (PD) is the indicator of the insulation defect in cables. However, the pulse current method, which is widely adopted in land cables, cannot obtain PD signals of high‐voltage direct current (HVDC) submarine cables due to attenuation and installation position.
Hang Wang, Haoran Zhang, Lei Li, Shuai Yang, Jun Chen, Bangdou Huang, Cheng Zhang, Tao Shao   +7 more
wiley   +1 more source

GSLI‐RTMdet: An automatic nondestructive detection method for internal defects in gas‐insulated switchgear X‐DR images

High Voltage, Volume 10, Issue 4, Page 890-902, August 2025.
Abstract Accurately identifying the location and type of internal defects in gas‐insulated switchgear (GIS) is a challenge. To address this challenge, this study proposes a novel method for the nondestructive detection of GIS internal defects. This method is based on x‐ray digital radiography (X‐DR) technology and an improved real‐time models for ...
Guote Liu, Zhihao Su, Bing Luo, Yongxuan Zhu   +3 more
wiley   +1 more source

Review of Insulation Defect Detection Methods for a Gas-Insulated Switchgear

Energies
Gas-insulated switchgear (GIS) is a critical component of modern power systems. During operation, internal defects increase the probability of partial discharge and flashover within the insulation system, thereby constituting a major cause of equipment ...
Tengfei Li, Qin Xu, Kai Gao, Zhiwen Yuan, Junjie Chen, Chuanyang Li   +5 more
doaj   +1 more source

Mechanical vibration state and its defect severity development trend prediction for gas‐insulated switchgear equipment: Attention‐bidirectional gated recurrent unit model construction and experimental verification

High Voltage, Volume 10, Issue 4, Page 831-844, August 2025.
Abstract Mechanical vibration defect is the key factor leading to sudden failure of gas‐insulated switchgear (GIS) equipment. It is important to realise effective prediction of the mechanical vibration state development trend of GIS equipment in order to improve its active safety protection level.
Xu Li, Jian Hao, Ruijin Liao, Yao Zhong, Ying Feng, Ruilei Gong   +5 more
wiley   +1 more source

A novel GIS breakdown location method based on natural frequency of transient voltage

High Voltage, Volume 10, Issue 4, Page 856-875, August 2025.
Abstract During on‐site withstand voltage tests of gas‐insulated switchgears (GIS), once a breakdown occurs, it is hard to locate the breakdown position due to the intricate branch structures and minimal breakdown energy. The existing methods may require the placement of a large number of sensors with unsatisfactory accuracy, which adversely affects ...
Qiang Sun, Dengwei Ding, Yanpeng Ge, Ziwei Zhang, Wensheng Gao, Weidong Liu, Ke Zhao, Bo Liu, Lei Wang, Jiaqi Qu   +9 more
wiley   +1 more source

Imaging time series for the classification of EMI discharge sources [PDF]

, 2018
In this work, we aim to classify a wider range of Electromagnetic Interference (EMI) discharge sources collected from new power plant sites across multiple assets. This engenders a more complex and challenging classification task.
Boreham, Philip, Hughes-Narborough, Michael, Mitiche, Imene, Morison, Gordon, Nesbitt, Alan, Stewart, Brian G.   +5 more
core   +2 more sources

Study on surface flashover characteristics of basin-type insulators under low-frequency transmission based on multiphysics coupling

Zhejiang dianli
To study the surface flashover characteristics of single-phase basin-type insulators in gas insulated metal-enclosed switchgear （GIS） under low-frequency transmission， an electro-thermal-fluid coupling simulation is employed.
LI Guoqiang, BIAN Rong, CHEN Keji, ZHANG Linlin, GU Miaosong, CHENG Zhi, WANG Chao   +6 more
doaj   +1 more source

The electromagnetic effect study of GIS enclosure under high-frequency electromagnetic pulse

The Journal of Engineering, 2019
In gas insulated switchgear (GIS) substation, due to the operation of disconnect switch and circuit breaker, as well as short-circuit fault, SF6 will break down very rapidly.
Shu Chen, Jie Guo, Chengbo Hu, Fengbo Tao, Tianxi Xie, Yang Xu, Jun Jia   +6 more
doaj   +1 more source