Results 81 to 90 of about 3,083 (217)

Breakdown Voltage of Polymeric HVDC Insulation at DC Stress and Superimposed Lightning Impulse Voltages

, 2022
Space charge formation makes it difficult to predict the resulting electric field distribution within HVDC cable insulation. The main purpose of the work presented here has been to experimentally study how the lightning impulse breakdown strength of ...
Olsen, Espen Torlei, Mauseth, Frank, Ildstad, Erling   +2 more
core   +1 more source

Lightning Protection Technology for Overhead Insulated Lines of 10kV Distribution Network Based on Linear Least Square Positioning Method

Journal of Applied Science and Engineering
The calculation of the series gap distance of the lightning protection device in the 10 kV distribution network is rough, and the positioning error of the lightning strike point may be large, which affects the stability of electricity consumption ...
Fengwen Chen
doaj   +1 more source

Gaseous by-products of a CF3I-CO2 gas mixture under lightning impulse and AC breakdowns

, 2017
This paper examines the use of a CF3I-CO2 gas mixture as an environmentally friendly insulation medium in high voltage gas insulated equipment. The gaseous by-products of a 30:70% CF3I:CO2 (Trifluoroiodomethane – Carbon dioxide) gas mixture are examined ...
Haddad, A, Widger, Phillip
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Influence of electrode geometry on the lightning impulse breakdown voltage of palm oil [PDF]

, 2018
This paper presents a study of lightning impulse breakdown voltage of palm oil under needle/plane and needle/sphere electrode configurations. All tests were carried out at gap distance of 25 mm under both positive and negative polarities.
Azis, Norhafiz, Jasni, Jasronita, Ab Kadir, Mohd Zainal Abidin, Yaakub, Zaini, Yunus, Robiah, Thien, Yee Von   +5 more
core   +1 more source

Leader Propagation Characteristics Under Positive Lightning Impulse Voltages

IEEE Access
Lightning strikes on transmission lines often generate overvoltage, which is the primary reason for insulator string flashover. This overvoltage, with a rapid rise time of just a few microseconds, causes leader propagation characteristics to differ ...
Lei Jia, Song Zhang, Lu Qu, Yongxiang Cai, Huaifei Chen, Xiaobing Xiao, Ruihan Qi, Minchuan Liao, Jian Hu   +8 more
doaj   +1 more source

Study on temperature rise prediction of ZnO varistors under multiple lightning strikes based on BP neural network and microscopic

High Temperature Materials and Processes
ZnO varistors are widely used in the field of lightning protection. After being struck by lightning, ZnO varistors absorb heat, which can lead to temperature rise and even damage, posing a serious safety threat to electrical safety.
Li Chunying, Zhang Chunlong, Lv Qing
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

Digital measurement of lightning impulse parameters using curving fitting algorithms [PDF]

, 1999
This paper describes the application of curve fitting algorithms to aid the evaluation of lightning impulse parameters. A number of popular curve fitting algorithms have been evaluated and compared.
Blackett, J., Ryan, H. M., Wong, K. C. P., Tindle, J., Watts, M. W.   +4 more
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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

Alternative method for processing tail chopped lightning impulse waveforms

, 2015
The International Electrotechnical Commission issued in 2010 a revision of the standards IEC 60060, describing how to calculate amplitude and time parameters used to evaluate high voltage tail chopped lightning impulse waveforms.
Hällström, Jari; id_orcid, Hall Barbosa, Carlos R., Azevedo, Luiz C., Ferreira, Lilian S., Silva, Marcio T.   +4 more
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