Results 91 to 100 of about 787,692 (200)

Method for calculating corona inception voltage of ultra‐high‐voltage direct current transmission lines with frequency‐domain characteristics of corona current

IET Generation, Transmission & Distribution, 2017
Corona inception voltage is of great significance for the design of ultra‐high‐voltage direct current transmission lines. In this study, based on the change rule of frequency‐domain characteristics of corona current, a new method for calculating corona ...
Yingyi Liu, Lijuan Zhou, Yuanqing Liu, Haiwen Yuan, Liang Ji   +4 more
doaj   +1 more source

Space charge accumulation under the effects of temperature gradient on solid dielectric DC cable

, 2009
It is well known that existence and accumulation of space charge within the insulating material poses threat to the reliability in the operation of dc power cables. When the cables are loaded under high voltage direct current (HVDC), temperature gradient
Chen, George, Choo, Wilson, Swingler, Steve   +2 more
core  

Direct observation of a gate tunable band-gap in electrical transport in ABC-trilayer graphene

, 2015
Few layer graphene systems such as Bernal stacked bilayer and rhombohedral (ABC-) stacked trilayer offer the unique possibility to open an electric field tunable energy gap.
Craciun, M. F., Khodkov, T., Khrapach, I, Russo, S.   +3 more
core   +2 more sources

Study of switching transients in high frequency converters [PDF]

As the semiconductor technologies progress rapidly, the power densities and switching frequencies of many power devices are improved. With the existing technology, high frequency power systems become possible. Use of such a system is advantageous in many
Elbuluk, Malik E., Lee, Tony, Zinger, Donald S.   +2 more
core   +1 more source

Electromigration in thin tunnel junctions with ferromagnetic/nonmagnetic: nanoconstrictions, local heating, and direct and wind forces

, 2005
Current Induced Resistance Switching (CIS) was recently observed in thin tunnel junctions with ferromagnetic (FM) electrodes \emph{i.e} FM/I/FM. This effect was attributed to electromigration of metallic atoms in nanoconstrictions in the insulating ...
J. B. Sousa, J. Ventura, N. W. Ashcroft, P. P. Freitas, R. Ghez, R. S. Sorbello, Y. Liu, Z. Zhang   +7 more
core   +1 more source

Polytopic Lyapunov Function-Based Hybrid Switching Control Strategy for High Voltage Direct Current Networks

IEEE Open Access Journal of Power and Energy
The increased use of High-Voltage Direct Current transmission networks requires appropriate control strategies for the converter stations, which are crucial to ensure uninterrupted energy supply.
Rohan Kamat Tarcar, Marjan Popov, Aleksandra Lekic   +2 more
doaj   +1 more source

Calculation Methods of High-Voltage Direct Current (HVDC) Line Sag Considering Meteorology

Energies
Sag is one of the important indicators for judging whether a transmission line is safe. The existing sag calculation method does not consider the temperature difference between conductor strands, causing the calculated results to often deviate from the ...
Xin Li, Zuibing Xie, Linping Zeng, Long Zhao   +3 more
doaj   +1 more source

Fault location in high-voltage direct-current grids based on panoramic voltage features and vision transformers

International Journal of Electrical Power & Energy Systems
This paper presents a novel fault location method designed for high-voltage direct-current (HVDC) grids equipped with quick-action protections and circuit breakers.
Bo Ren, Yongjie Luo, Niancheng Zhou, Qianggang Wang   +3 more
doaj   +1 more source

Optically isolated logarithmic nanoammeter capable of floating to 5 kilovolts [PDF]

A logarithmic current-measuring instrument was developed to measure plasma coupling currents at a common mode voltage of 5 kilovolts. Positive or negative currents can be measured from 10 to the -9th power to .001 ampere direct current. Optical isolation
Delaat, J. C., Sturman, J. C.
core   +1 more source

Study of Resistive-Type Superconducting Fault Current Limiters for a Hybrid High Voltage Direct Current System. [PDF]

Materials (Basel), 2018
Chen L, He H, Li G, Chen H, Wang L, Chen X, Tian X, Xu Y, Ren L, Tang Y.   +9 more
europepmc   +1 more source