Results 21 to 30 of about 18,181 (263)

Study on the reliability of new kind of ±1 100 Kv DC voltage divider under the action of impulse voltage

The Journal of Engineering, 2019
To meet the special insulation demand of the DC transmission system with the highest voltage in the world, a new kind of ±1 100 kV DC voltage divider is designed.
Wu Shipu, Pang Wenlong, Yang Zhining, Zhang Kejie, Wu Xixiu   +4 more
doaj   +1 more source

Impact of time parameters of lightning impulse on the breakdown characteristics of oil paper insulation

High Voltage, 2016
At present, the insulation performances of electrical apparatus under lightning impulse voltages are always evaluated by the withstand test of standard lightning impulse voltage (1.2/50 µs), which is recommended by IEC Standard.
Wenxia Sima, Potao Sun, Ming Yang, Jingyu Wu, Jiefang Hua   +4 more
doaj   +1 more source

Experimental Assessment on Air Clearance of Multiple Valve Unit Considering Switching Impulse and DC Superimposed Switching Impulse

Energies, 2020
Multiple valve unit (MVU), which converts AC to DC and DC to AC, is one of the key elements of high voltage DC (HVDC) transmission. Therefore, the insulation design of MVU against overvoltage should be considered for the stable and reliable operation of ...
Jae-Hong Koo, Jae-Kyu Seong, Ryul Hwang, Bang-Wook Lee   +3 more
doaj   +1 more source

HIGH VOLTAGE DIVIDER DNV-20I FOR BROADBAND INFORMATION-MEASURING SYSTEMS

Надежность и качество сложных систем, 2022
Background. The relevance of the use of high-voltage voltage dividers in information-measuring systems is determined by the wide use of high voltages in various fields of human activity.
A.S. Ilin, I.A. Karchev, A.P. Voronov
doaj   +1 more source

Impulse Characteristics of Highly Wetted Soils [PDF]

Journal of Electrical and Electronics Engineering, 2023
It has been well accepted that under high impulse conditions, ionisation process in soil would occur, causing the ground resistance value to fall to a lower value than that obtained at low voltage low current, RDC.
REFFIN Muhd Shahirad, MOHAMAD NOR Normiza, ABDUL RAHMAN Nurul Azlina, ABDULLAH Noradlina Abdullah, HATTA Norhasliza   +4 more
doaj  

An optimal phase control method for the suppression of phase sequence exchange impulse current and voltage

IET Power Electronics, 2022
Phase sequence exchange (PSE) is an emerging emergency control method for power systems. However, PSE will generate impulse current and voltage. In this research, to suppress the impulse of PSE, a phase control method for zero‐current opening and equal ...
Yifan Li, Peng Sun, Hui Li, Shaofeng Huang, Haifeng Wu   +4 more
doaj   +1 more source

Study of the waves propagation of lightning overvoltage impulse in the catenary system of electrified railways

Вестник Научно-исследовательского института железнодорожного транспорта, 2022
Introduction. The article is devoted to the study of the waves propagation of lightning overvoltage impulse in the catenary system of electrified railways.
K. S. Belomestnykh, A. N. Bardin, S. N. Vechkanov, A. A. Krylov   +3 more
doaj   +1 more source

Comparative high voltage impulse measurement

Journal of Research of the National Institute of Standards and Technology, 1996
A facility has been developed for the determination of the ratio of pulse high voltage dividers over the range from 10 kV to 300 kV using comparative techniques with Kerr electro-optic voltage measurement systems and reference resistive voltage dividers. Pulse voltage ratios of test dividers can be determined with relative expanded uncertainties of 0.4
FitzPatrick, Gerald J., Kelley, Edward F.   +1 more
openaire   +2 more sources

The analytical method for determining the parameters of impulse overvoltages from atmospheric discharges [PDF]

Bakar
Impulse generators with RC circuits form the foundation for producing surge voltages used in high-voltage equipment testing. In high-voltage engineering literature, the expressions for impulse voltage waveforms include known parameters of lightning or ...
Marković Nenad, Bjelić Slobodan, Marković Strahinja   +2 more
doaj   +1 more source

Coherence and time-frequency analysis of impulse voltage and current measurements

Journal of Energy in Southern Africa, 2017
The aim of this paper is to point out the advantages of the use of the time-frequency analysis in the digital processing of waveforms recorded in high voltage impulse tests.
Jelena Dikun, Emel Onal
doaj   +1 more source