Results 11 to 20 of about 4,753,988 (311)

A New Dual Polarity Direct AC-AC Voltage Regulator Ensuring Voltage Step-Up and Step-Down Capabilities

open access: yesApplied Sciences, 2021
The problem of voltage sag and swell is one of the major reasons for low-quality power in the distribution system. Normally, it results from the system’s faults, including line-to-ground and line-to-line, non-linear characteristics of loads and sources ...
Naveed Ashraf   +6 more
doaj   +1 more source

Optimal Power Flow With Step-Voltage Regulators in Multi-Phase Distribution Networks [PDF]

open access: yesIEEE Transactions on Power Systems, 2019
This paper develops a branch-flow-based optimal power flow (OPF) problem for multi-phase distribution networks that allows for tap selection of wye, closed delta, and open delta step-voltage regulators (SVRs).
M. Bazrafshan, Nikolaos Gatsis, Hao Zhu
semanticscholar   +1 more source

Pre-breakdown phenomena in hydrocarbon liquids in a point-plane gap under step voltage. Part 2: behaviour under negative polarity and comparison with positive polarity

open access: yesJournal of Physics Communications, 2020
This study addresses the dielectric performance of nonpolar hydrocarbon liquids and mineral oils under negative polarity stress. Stopping length for non-breakdown streamers, breakdown voltages and velocities for various pre-breakdown streamer modes have ...
L. Lundgaard   +4 more
semanticscholar   +1 more source

Design considerations of asymmetric step-up/down dual-resonator charger for lithium-ion battery applications

open access: yesEnergy Reports, 2022
In Lithium-ion battery charging applications, wide step-up/down voltage gain range converters are commonly used. The resonant frequency ratio and quality factor can seriously affect the switching frequency range and voltage gain characteristics of the ...
Yubo Han   +6 more
doaj   +1 more source

Grid Grounding Calculations for a 132-KV Substation Using Soil Backfilling

open access: yesIEEE Access, 2019
Safe and reliable grid design is complicated by the compact design of gas insulated substations (GIS). This paper discusses the complete grounding design procedure for a 132-KV substation in the city of Al Kharj based on the IEEE-80 specifications and ...
Saeed Alyami
doaj   +1 more source

Impact of step voltage parameters on accuracy of evaluating XLPE insulation DC voltage endurance coefficient

open access: yesIET Generation, Transmission & Distribution, 2023
The voltage endurance coefficient n of cross‐linked polyethylene (XLPE) insulation is an important indicator for the analysis of insulation failure mechanism.
Zhipeng Ma   +7 more
doaj   +1 more source

Novel Bidirectional Isolated DC/DC Converter with High Gain Ratio and Wide Input Voltage for Electric Vehicle Storage Systems

open access: yesBatteries, 2022
This study proposes a novel bidirectional isolated DC/DC converter with a high gain ratio and wide input voltage for electric vehicle (EV) storage systems.
Yu-En Wu, Chen-Han Tai
doaj   +1 more source

Horizontal Electric Field in the Vicinity of Structures Hit by Lightning

open access: yesAtmosphere, 2016
The horizontal electric field at the ground surface in the vicinity of structures hit by lightning flashes is relevant to the safety of human beings and livestock; it determines the touch and step voltages around the structure.
Celio Fonseca Barbosa
doaj   +1 more source

Non‐isolated interleaved bidirectional DC–DC converter with high step voltage ratio and minimum number of switches

open access: yesIET Power Electronics, 2019
In this study, a new non-isolated interleaved bidirectional DC-DC converter with a high step voltage ratio based on coupled inductors (CIs) is introduced.
M. Shaneh, M. Niroomand, E. Adib
semanticscholar   +1 more source

A Non-Isolated High Step-Up DC-DC Converter Using Voltage Lift Technique: Analysis, Design, and Implementation

open access: yesIEEE Access, 2022
This paper presents a new structure for non-isolated and non-inverting DC-DC converters with high voltage gain harnessing the fundamentals of the voltage lift technique. The proposed topology is a suitable structure for low voltage applications.
A. Rajabi   +5 more
semanticscholar   +1 more source

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