Results 101 to 110 of about 6,480,163 (254)

Performance Analysis and Threshold Quantization of Transformer Differential Protection Under Sampled Value Packets Loss/Delay

open access: yesIEEE Access, 2019
The performance of the process network in the smart substation is particularly important for relaying functions implementation, and the transmission quality of sampled value packets is becoming the key constraint on protections because they carry ...
Ruiwen He   +4 more
doaj   +1 more source

Incorporation of faults in transmission lines with a nonlinear model of power systems

open access: yes, 2004
In this paper we present a novel approach for the study of faults on the transmission network of a power system. This is achieved by deriving an analytical nonlinear model of the power system with the fault signals modelled as inputs. The power system is
Aldeen, M., Crusca, F., Sharma, R.
core  

Grayscale Photomasks Enable Noncontact Optical Patterning of Hydroxypropyl Cellulose Gels for Dynamic Art

open access: yesAdvanced Functional Materials, EarlyView.
Mask‐encoded UV exposure translates digital color information into pixel‐resolved structural‐color patterns in hydroxypropyl cellulose gels. Gaussian‐process‐guided calibration links UV processing conditions, wavelength, and mask opacity, enabling parallel fabrication of multicolor images in a single 10 s exposure.
Mengting Ye   +8 more
wiley   +1 more source

The determination of short circuits and grounding faults in electric power systems using time-frequency analysis

open access: yesJournal of Energy in Southern Africa, 2017
In order to ensure that electrical energy reaches consumers uninterrupted, researchers constantly try to improve power transmission lines. To realize this improvement, probable faults should be analysed through every known method, and new methods should ...
Vedat Esen   +2 more
doaj   +1 more source

Detection, classification, and location of faults in power transmission lines

open access: yesInternational Journal of Electrical Power & Energy Systems, 2015
Abstract This paper presents a pattern recognition approach for current differential relaying of power transmission lines. The current differential method uses spectral energy information provided through a new Fast Discrete S-Transform (FDST). Unlike the conventional S-Transform (ST) technique the new one uses different types of frequency scaling ...
K.R. Krishnanand, P.K. Dash, M.H. Naeem
openaire   +2 more sources

Field programmable gate array implementation for fault detection in a power transmission lines

open access: yes, 2010
The aim of this thesis is to design an FPGA implementation for faults detection in power transmission lines. A prototype of DE2 board training kit with Cyclone IIEP2C35F672C6 FPGA processor is used to perform the analysis and obtain experiment results ...
Peh, Kok Guan
core  

Halide Composition Controls Phase Morphology and Device Specific Performance in Perovskite Photovoltaics and Light Emitting Diodes

open access: yesAdvanced Functional Materials, EarlyView.
We demonstrate that halide composition determines phase morphology, governing distinct operating mechanisms in mixed halide perovskites. Phase segregating 75% Br compositions enhance solar cell performance, whereas intrinsically phase‐separated 95% Br compositions provide stable light emitting diodes.
Tal Binyamin   +6 more
wiley   +1 more source

Location of Faults in Power Transmission Lines Using the ARIMA Method

open access: yesEnergies, 2017
One of the major problems in transmission lines is the occurrence of failures that affect the quality of the electric power supplied, as the exact localization of the fault must be known for correction.
Danilo Pinto Moreira de Souza   +2 more
doaj   +1 more source

An Efficient Method Based on the Electromagnetic Time Reversal to Locate Faults in Power Networks [PDF]

open access: yes, 2014
This paper presents a new method based on the electromagnetic time-reversal (EMTR) theory for locating faults in power networks. The applicability of the EMTR technique to locate faults is first discussed.
Reza Razzaghi   +13 more
core   +2 more sources

Ligand Assisted Epitaxial Growth of CsPbBr3 Microcrystal Resonators With Record ‐Low Lasing Thresholds

open access: yesAdvanced Functional Materials, EarlyView.
Solution‐based ligand‐assisted epitaxial growth (LAEG) yields high‐quality CsPbBr3 microcrystals on different substrates with superior morphology, passivated surfaces, and high photoluminescence quantum yield. These robust micro‐resonators achieve record‐low room‐temperature lasing thresholds of 7.2 kW·cm−2 and maintain operational stability up to 90 ...
Shuyu Zhou   +19 more
wiley   +1 more source

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