Results 11 to 20 of about 23,110 (309)

Comparison of Aging Effect of Ester Liquids and Mineral Oil in Semi-Uniform Field Geometry under Lightning Impulse Voltage and Standard Compliant AC Voltage Testing

Energies
This study examines and compares the breakdown and aging properties of five insulating liquids. Additionally, the influence of different voltage polarities on these properties was analyzed to investigate the effect of aging on polarity behavior under ...
Sabrina Krügel, Ronald Plath
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Portable High Voltage Impulse Generator

Ingeniería e Investigación, 2011
This paper presents a portable high voltage impulse generator which was designed and built with insulation up to 20 kV. This design was based on previous work in which simulation software for standard waves was developed.
S. Gómez, M. P. Buitrago, F. A. Roldán
doaj   +2 more sources

Evaluation of Lightning Impulse Test by Frequency Response Analysis [PDF]

, 2006
In this work are presented the basis for improving the interpretation of transformer lightning impulse test and the development of a graphical user interface system, which allows comparisons of time domain data and frequency response.
Jorge Ramirez, Baudilio Valecillos, Valecillos, Baudilio, Ramírez, Jorge   +3 more
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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
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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
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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
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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
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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
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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
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