Results 51 to 60 of about 732,564 (210)

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

Flashover phenomena of polluted insulators energized by AC voltage [PDF]

, 1999
The study of polluted insulator flashover mechanism very important for electric power transmission reliability, efficiency and sewiceability. In this paper, a new mathematical model based on Ayrton arc voltage gradient equation, which takes account of ...
Ahmad, Hussein, A.S. Ahmad, Salam, Md. Abdus, T. Tamsir, Tamsir, Tarmidi, A. Salam, Buntat, Z., Piah, M. A. M., M.A.M. Piah, Z. Buntat, Ahmad, Ahmad S., H. Ahmad   +11 more
core   +1 more source

Flashover Voltage Prediction Models under Agricultural and Biological Contaminant Conditions on Insulators [PDF]

, 2022
The flashover performance of contaminated insulators highly depends on the type of pollutant and its present concentration. In this paper, important agricultural salts (NaCl, K2SO4, NaHCO3, CaSO4, KHCO3, MgSO4, NH4), 2Fe(SO4)2, and 6H2O (ferrous ammonium
Lucian Mihet-Popa, Basem Alamri, Asfar Ali Khan, Shabana Khatoon, Khatoon, Shabana, Khan, Asfar Ali, Mihet-Popa, Lucian, Mohd Tariq, Tariq, Mohd, Alamri, Basem   +9 more
core   +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

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

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

AC Volume Breakdown and Surface Flashover of a 4% Novec^TM 4710/96% CO₂ Gas Mixture Compared to CO₂ in Highly Nonhomogeneous Fields

Energies, 2020
AC pre-discharge currents, breakdown, and flashover voltage measurements are reported in a 10 mm needle-plane arrangement in a 4% NovecTM 4710/96% CO2 gas mixture and compared with CO2 for pressures up to 8.8 bar abs.
Houssem Eddine Nechmi, Mohammed El Amine Slama, Abderrahmane (Manu) Haddad, Gordon Wilson   +3 more
doaj   +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

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

Comparative Analysis of Machine Learning Algorithms for Automated Hydrophobicity Classification in Composite Insulators Using Contour Features

High Voltage, EarlyView.
ABSTRACT This study presents a comparative analysis of six machine learning algorithms for automated hydrophobicity classification in composite insulators using contour‐based image features. A robust image‐processing pipeline was developed to extract statistical features from water droplet patterns on insulator surfaces, enabling objective ...
Salihu Salisu, Christos Zachariades, Aliyu Abubakar   +2 more
wiley   +1 more source