Results 21 to 30 of about 789,537 (359)
Entropy, 2015 On the basis of analyzing high-voltage direct current (HVDC) transmission system and its fault superimposed circuit, the direction of the fault components of the voltage and the current measured at one end of transmission line is certified to be ...
Sheng Lin +3 more
doaj +1 more source
Enhanced transmission line pilot impedance and pilot protection
IET Generation, Transmission & Distribution, 2011 This study proposes a novel pilot protection for transmission lines by using enhanced transmission line pilot impedance (ETLPI). The ETLPI is defined by the ratio of the voltage difference of fault-superimposed component to the current summation of fault-superimposed component at both terminals of the protected line and used to distinguish the internal
J. Xia +5 more
openaire +1 more source
The step project:societal and political engagement of young people in environmental issues [PDF]
, 2017 Decisions on environmental topics taken today are going to have long-term consequences that will affect future generations. Young people will have to live with the consequences of these decisions and undertake special responsibilities.
Apostolidis, Lazaros +10 more
core +2 more sources
The peroxidation of leukocytes index ratio reveals the prooxidant effect of green tea extract [PDF]
, 2016 Despite tea increased plasma nonenzymatic antioxidant capacity, the European Food Safety Administration (EFSA) denied claims related to tea and its protection from oxidative damage.
Longhitano, Yaroslava +6 more
core +3 more sources
Effective time of a diffusion source in a pack cementation process on the AZ91D magnesium alloy
Journal of Materials Research and Technology, 2023 The powder thermal diffusion alloying method is an important method to fabricate intermetallic coatings on magnesium alloy substrates. The diffusion source, the diffusion time and the diffusion temperature are key parameters for a diffusion alloying ...
Dongzhu Lu +5 more
doaj +1 more source
Waveform Similarity-Based Robust Pilot Protection for Transmission Lines [PDF]
IEEE Transactions on Power Delivery, 2022 This paper proposes a robust pilot protection scheme based on waveform similarity that restricts the influence of outliers in fault line identification. By comparing two refactoring currents constructed using the time-domain sampling values of currents at the two terminals of a transmission line, a waveform similarity algorithm called the Kendall's Tau
Guangxiao Zhang +3 more
openaire +2 more sources
Journal of Materials Research and Technology, 2023 In-situ crevice corrosion images of U75V high-speed rail steel samples before and after heat treatment for microstructure refinement were obtained by a self-developed monitoring device, and facile image processing techniques have been developed.
Jian Wang +5 more
doaj +1 more source
Applied SciencesWhen faults occur in transmission lines of grid-forming PV systems, the LVRT control and virtual impedance function cause the fault characteristics of grid-forming inverters to differ significantly from those of synchronous generators, which deteriorates
Kuan Li, Qiang Huang, Rongqi Fan
doaj +1 more source
Crevice corrosion of U75V high-speed rail steel with varying crevice gap size by in-situ monitoring
Journal of Materials Research and Technology, 2022 Crevice corrosion of high-speed rail steel U75V was studied with varying gap size by using self-designed device. Increasing gap size inhibited exterior cathodic reduction reaction of oxygen, inducing decrease of potential difference between interior and ...
Weichen Xu +6 more
doaj +1 more source
Biweight Midcorrelation Based Transmission Line Pilot Protection Algorithm
IEEE Open Access Journal of Power and EnergyThis paper presents a novel pilot protection algorithm for alternating current (ac) transmission lines that relies on biweight midcorrelation (BWMC) coefficients between the terminals’ currents.
Rodrigo Rozenblit Tiferes +3 more
doaj +1 more source