Results 41 to 50 of about 884 (177)

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

A Novel Model for Prediction of Flashover 150kV Polluted Insulator Based on Nonlinear Autoregressive External Input Neural Network

Protek: Jurnal Ilmiah Teknik Elektro
This study aims to use an artificial neural network to forecast the flashover voltage of a polluted high-voltage insulator. Practical tests were conducted on a high-voltage insulator to gather data for the neural network.
Mardini Hasanah, Novizon Novizon, Rusvaira Qatrunnada, Yusreni Warmi, Sitti Amalia, Herris Yamashika   +5 more
doaj   +1 more source

Flashover Performance Test with Lightning Impulse and Simulation Analysis of Different Insulators in a 110 kV Double-Circuit Transmission Tower

Energies, 2018
The flashover performance of insulators is the foundation of the calculation of precise lightning protection. The material and structure of an insulator affect its flashover performance but the research on the differences in the flashover performance of ...
Yaqi Zhang, Licheng Li, Yongxia Han, Yaoxuan Ruan, Jie Yang, Hansheng Cai, Gang Liu, Yi Zhang, Lei Jia, Yutang Ma   +9 more
doaj   +1 more source

Study on the Coupled Effects of High‐Speed Airflow and Charged Sand on Power‐Frequency Discharge Characteristics of Conductor–Tower Gaps in Strong Wind–Sand Environments

High Voltage, EarlyView.
ABSTRACT Strong wind–sand weather in Xinjiang threatens power grid safety by increasing transmission line tripping risks. Existing studies focus on sand polarization but neglect the coupled influence of high‐speed airflow and charged sand on gap discharge characteristics.
Jianghai Geng, Yang Wang, Ping Wang, Yang Lu, Songsong Zhou, Yujian Ding, Xiaojun Zhang, Wenbing Zhuang, Yu Su   +8 more
wiley   +1 more source

Effects of Absolute Humidity on Flashover Voltage of Insulators

IEEJ Transactions on Power and Energy, 2007
Effect of humidity on flashover voltage of four kinds of porcelain and one polymer insulators was studied experimentally for several years under natural humidity condition in Japan. It was found that the existing IEC humidity correction seems to be proper for most insulators regardless of the kind of applied voltage but that change may be necessary for
Fujii, Osamu, Hidaka, Kazuhiro, Mizuno, Yukio, Naito, Katsuhiko, Irie, Takashi, Nishikawa, Morio   +5 more
openaire   +2 more sources

Experimental Study on Disintegration Characteristics of Water Droplets in Icicle‐Flat Plate Gap Beyond Critical Discharge Voltage

High Voltage, EarlyView.
ABSTRACT The disintegration behaviour of ice‐melting droplets aggravates the discharge risk of ice‐covered insulators and the disintegration characteristics of droplets at applied voltages exceeding the critical discharge voltage lack in‐depth study.
Lin Yang, Xinyang Gou, Xingkun Hu, Jiabao Ding, Yanpeng Hao, Licheng Li, Hao Li   +6 more
wiley   +1 more source

Failure behavior of dielectric films for peaking capacitor subjected to surface flashover under nanosecond pulses

AIP Advances, 2023
The flashover failure and damage of polypropylene (PP) and polyester (PET) films under nanosecond current pulses were experimentally investigated.
Zhiqiang Chen, Jinru Sun, Ziyi Dong, Jiaxin Ren, Wei Jia, Fan Guo, Linshen Xie, Wei Wu, Xueling Yao   +8 more
doaj   +1 more source

Temperature Extraction Scheme for Composite Insulator Core Rod Sheath of Overhead Transmission Lines Based on Oriented Bounding Boxes

High Voltage, EarlyView.
ABSTRACT Unmanned Aerial Vehicle (UAV) inspection of overhead transmission line composite insulators allows for the rapid acquisition of large amounts of infrared images of insulators in service, which can be used to analyse their operational status. However, efficiently and accurately analysing these images remains a challenge.
Zhenan Zhou, Xinzhe Yu, Yu Deng, Chen Gu, Kun Zhang, Zheyuan Liu, Songsong Zhou, Yueneng Xu   +7 more
wiley   +1 more source

Investigation of the Partial Discharge Inception and Flashover With IEC‐Based Comparative Tracking Index Electrodes and Comparison With Homogeneous and Inhomogeneous Electric Fields at Varying Pressures for Aerospace Applications

High Voltage, EarlyView.
ABSTRACT For designing aeronautical components, the creepage distance is usually estimated by considering the pollution level and the dielectric material group as defined by the standard IEC 60664‐1. The material group is expressed by the comparative tracking index (CTI) performed at atmospheric pressure following the standard IEC 60112.
Somya Anand, Mohammed El Amine Slama, Pierre Henrard, Michaël Darques, Solomon Berihu Araya   +4 more
wiley   +1 more source

Research on Hot-line Cleaning of Artificial Contaminanted Insulator Using High Pressure Hot Water Vapor

Gaoya dianqi, 2014
The hot-line cleaning of insulator contaminants has a great significance to prevent pollution flashover.The technique of hot-line cleaning insulator contaminants by water vapor is proposed in this paper.The flashover characteristics of insulator under ...
LE Zhenchun, ZHAO Wenbin, YANG Guoqing, FU Chenzhao, JI Shengchang   +4 more
doaj