Results 71 to 80 of about 1,321 (185)

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

Significantly Improved Electrical Breakdown Strength of Natural Ester Liquid Dielectrics by Doping Ultraviolet Absorbing Molecules

IEEE Access, 2019
In this paper, we experimentally demonstrate that molecules with maximum absorption wavelength corresponding to the first excitation energy of base liquid molecules are able to significantly improve the electrical performances of natural ester oils.
Suning Liang, Feipeng Wang, Zhengyong Huang, Weigen Chen, Youyuan Wang, Jian Li   +5 more
doaj   +1 more source

Experimental Study on Performance of SF6+N2 Mixed Gas Insulation

MATEC Web of Conferences, 2016
This paper designed and constructed a 126kV GIS partial discharge test platform, performed frequency breakdown tests and lighting impulse tests at temperature of -30~20℃to SF6/N2 gas mixture.
Lu Gang, Su Zhen Xi, Xu Ou, Zhang Liang, Lan Gong Yu, Liu Yang, Zhang Hong Da   +6 more
doaj   +1 more source

Long-term field measurement and characteristics of lightning-induced overvoltages on 10 kV distribution lines in high-altitude mountainous areas and optimization of insulation coordination

Results in Engineering
Aiming at the lack of measured data on lightning overvoltages in operational distribution networks and the irrationality of insulation coordination based on standard lightning impulse waveforms, this paper carries out large-scale and long-term ...
Li Shao, Ke Wang, Zhisong Xu, Hao Yang, Ran Huang, Bao Zhao, Hengxin He   +6 more
doaj   +1 more source

Characteristics and influence of lightning impulse discharge of zero-value insulator strings in heavy rainfall environment

电力工程技术
Heavy rainfall can bridge the sheds of insulators on transmission lines, substations, and converter stations with continuous water columns, leading to electric field distortion.
Bingbing DONG, Yu QIAO, Xia YAO
doaj   +1 more source

Study on Transient Overvoltage and Surge Arrester Electrical Stresses in Offshore Wind Farms Under Multiple Lightning Strokes

Journal of Marine Science and Engineering
Lightning strikes are a major cause of wind turbine (WT) damage, with approximately 80% of cloud-to-ground lightning strikes exhibiting a multi-stroke characteristic. Therefore, studying the transient overvoltages induced by multiple lightning strokes is
Jie Zhang, Yong Wang, Jun Xiong, Junxiang Liu, Lu Zhu, Chao Huang, Jianfeng Shi, Yongxia Han   +7 more
doaj   +1 more source

Photonic Voltage Transducer with Lightning Impulse Protection for Distributed Monitoring of MV Networks. [PDF]

Sensors (Basel), 2020
Fusiek G, Niewczas P.
europepmc   +1 more source

Evaluation of Step Response of Transient Recorders for Lightning Impulse

, 2017
High voltage equipment will be subjected to several types of electrical stress during operation. A battery of factory tests is defined to ensure that the equipment will perform satisfactorily in service. One of the crucial tests is to apply a simulated lighting impulse as standardised to a double-exponential impulse with at front time of 1.2 µs (± 30 %)
Bergman, Anders, Elg, Alf Peter, Hällström, Jari   +2 more
openaire   +2 more sources

Structural fault analysis of air-core reactors under lightning impulse

Zhejiang dianli
In ultra-high voltage （UHV） converter stations， the encapsulation of air-core reactors may deform under lightning impulse due to electromagnetic forces， which may induce structural faults and jeopardize the safe operation of power system. To address this
ZONG Wanli, GUO Shikaihua, DING Ke, YE Ke, WAN Zhicheng, CHEN Jinpeng, CHEN Feng   +6 more
doaj   +1 more source

Research on Creeping Flashover Characteristics of Nanofluid-Impregnated Pressboard Modified Based on Fe₃O₄ Nanoparticles under Lightning Impulse Voltages. [PDF]

Nanomaterials (Basel), 2019
Shan B, Huang M, Ying Y, Niu M, Sun Q, Lv Y, Li C, Qi B, Xing Z.   +8 more
europepmc   +1 more source