Results 31 to 40 of about 6,096 (326)

A novel transformerless high step‐Up DC‐DC converter with active switched‐inductor and quasi‐Z‐source network

IET Power Electronics, 2021
Conventional dc–dc boost converters have limited boosting capabilities, and the main switching device may suffer relatively high voltage stress and current stress. A novel transformerless dc‐dc boost converter is proposed in this paper.
Jiawei Zhao, Daolian Chen, Jiahui Jiang
doaj   +1 more source

Simulation and Modeling of Detailed Load flow Analysis for the 400kVA and 132kVA Iraqi Grid

Journal of Engineering, 2023
A load flow program is developed using MATLAB and based on the Newton–Raphson method,which shows very fast and efficient rate of convergence as well as computationally the proposed method is very efficient and it requires less computer memory through ...
Ahmed Abdul Sahib Hashim
doaj   +1 more source

Modular DC‐DC auto‐transformer: Topology, operation, and system design

IET Power Electronics, 2021
Here, a modular DC‐DC auto‐transformer is proposed with a developed scheme of two‐port submodules. The proposed two‐port submodule is composed of six switches and single capacitor, and it is featured with three general working states.
Yang Chen, Han Wang, Miao Zhu, Ming Liu, Xu Cai   +4 more
doaj   +1 more source

SIDO coupled inductor‐based high voltage conversion ratio DC–DC converter with three operations

IET Power Electronics, 2021
Here, a single‐input, dual output (SIDO) coupled inductor‐based high voltage conversion ratio DC–DC converter is proposed. The proposed converter has the capability of operating as a SIDO converter in a way that the terminal of the input voltage source ...
Zahra Saadatizadeh, Pedram Chavoshipour Heris, Ebrahim Babaei, Frede Blaabjerg, Carlo Cecati   +4 more
doaj   +1 more source

Data Analysis Methodology Utilizing the Statistical Metrics Weight of Evidence (WoE) and Information Value (IV) to Assist in Asset Management of Power Transformers

IEEE Access
This article proposes an original contribution to assist in evaluating the condition of power transformers, the main asset of the electrical energy transmission sector. Due to constructive similarity, reactors are also evaluated. Data from the insulating
Gabriela S. Rema, Rafael M. Soares, Benedito D. Bonatto, Antonio C. S. Lima   +3 more
doaj   +1 more source

Mechanochemical Synthesis and Characterization of Nanostructured ErB4 and NdB4 Rare‐Earth Tetraborides

Advanced Engineering Materials, Volume 27, Issue 6, March 2025.
ErB4 and NdB4 nanostructured powders are produced by mechanochemical synthesis. 5 h mechanical alloying and 4 M HCl acid leaching are used in the production. ErB4 and NdB4 powders exhibit maximum magnetization of 0.4726 emu g−1 accompanied with an antiferromagnetic‐to‐paramagnetic phase transition at about TN = 18 K and 0.132 emu g−1 with a maximum at ...
Burçak Boztemur, Faruk Kaya, Bora Derin, Mustafa Lütfi Öveçoğlu, Ju Li, Duygu Ağaoğulları   +5 more
wiley   +1 more source

Interpreting dissolved gases in transformer oil: A new method based on the analysis of labelled fault data

IET Generation, Transmission & Distribution, 2021
In this contribution, a new dissolved gas analysis (DGA) method combining key gases and ratio approaches for power transformer fault diagnostic is presented. It is based on studying subsets and uses the five main hydrocarbon gases including hydrogen (H2),
Arnaud Nanfak, Samuel Eke, Charles Hubert Kom, Ruben Mouangue, Issouf Fofana   +4 more
doaj   +1 more source

Electrical Conductivities of Conductors, Semiconductors, and Their Mixtures at Elevated Temperatures

Advanced Engineering Materials, EarlyView.
This article presents a comprehensive review of temperature‐dependent electrical conductivity data for multiple material classes at elevated temperatures, highlighting a persistent conductivity gap between metals and semiconductors in the range of 102$\left(10\right)^{2}$– 107$\left(10\right)^{7}$ S/m. Metal–ceramic irregular metamaterials are proposed
Valentina Torres Nieto, Marcia A. Cooper
wiley   +1 more source

SELECTING SWITCHES FOR SWITCHING INDUCTIVE LOADS: TECHNICAL ASPECTS AND PRACTICAL CONSIDERATIONS [PDF]

Carpathian Journal of Electrical Engineering
In power systems, reactive compensation is a common and necessary practice to maintain the quality of electrical service. Disconnection of reactors or reactor banks is frequent, sometimes up to two or three times a day.
Carlos Manuel RUANO GONZÁLEZ
doaj   +1 more source

A 7.5 mW –43 dB LO leakage source‐driven wideband CMOS millimeter‐wave mixer

Electronics Letters, 2021
This paper presents a millimeter‐wave (mm‐wave) V‐band mixer. The source‐driven transformer‐coupled up‐converter topology can alleviate the local oscillator (LO) leakage problem.
Jiafu Lin, Chirn Chye Boon, Roc Berenguer, Gui Liu   +3 more
doaj   +1 more source