high voltage 2021
A new transformer‐less step‐up DC DC converter with high voltage gain and reduced voltage stress on switched‐capacitors and power switches for renewable
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In many modern applications such as renewable energy sources (RESs), DC DC step-up converters can be used to regulate the input variable and/or low voltage to achieve the desired characteristics such as amplitude and ripples at the output voltage. This article
SIDO coupled inductor‐based high voltage conversion ratio DC DC converter with three operations
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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 is exchangeable
Load frequency control of a multi‐area system incorporating realistic high ‐ voltage direct current and dish‐Stirling solar thermal system models under
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A maiden attempt was made to demonstrate the impact of realistic high voltage direct current (RHVDC) tie-line along with realistic dish-Stirling solar thermal system (RDSTS) models in multi-area load frequency control studies under a deregulated scenario. Area- area-2 and Abstract Development of green extractions of natural compounds is an ongoing challenge for researches. The aim of the study was to evaluate the extraction of bioactive compounds (BACs) from oregano combining an experimental procedure with a theoretical approach Abstract This Chapter 5 (Published as Cigr TB 476) covers workmanship associated with the jointing and terminating of AC land cables incorporating extruded dielectrics for the voltage range above 30 kV (U m= 36 kV) up to 500 kV (U m= 550 kV). Cigr TB 476 is a
Main aspects influencing the evaluation of atmospheric overvoltages in high voltage networks
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The effectiveness of lightning protection on the power and distribution grid is a significant factor, which influences the power distribution reliability and the failure rate of system elements. As part of this article, a mathematical model will be presented, taking into accountIn recent years, generation of hydroelectric power is growing expressively in Nepal contributing more than 90% in national grid responsible for domestic requirement of electrical energy. Both private and stateowned utility and its subsidiaries contributing their
Designing the Future Communication Architecture for High Voltage Substation
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This paper presents the design of substation among new technology which increases the concert of substations. The effectiveness of this substation higher than in present substation. And also it reduces the maintenance cost as well as fault happening and also reduces the
Output Voltage Regulation Of High Voltage Gain Non-Isolated Dc-Dc Boost Converter
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This paper features a high voltage dc-dc boost converter based on the 3-state switching cell for divided clamped-inverters with neutral split-point. A study of the proposed converter is carried out taking into account the operation in continuous conduction mode and the duty
Scattering Characteristics of Ultra- High Voltage Power Lines in Spaceborne SAR Images.
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Owing to its all-day and all-weather imaging capabilities, high-resolution spaceborne synthetic aperture radar has shown great potential for the effective monitoring of wide-area, ultrahigh-voltage (UHV) transmission lines. Scattering characteristics of UHV power lines in
Application of Pearson Type iii Statistics to High Voltage Breakdown Realizations.(Dept. E)
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In the high voltage engineering, the mathematical statistics play a domlnant role for choosing test procedures as well as for the analysis and 1nterpretation of measurements. However, the currently used normal, double exponent1al and Weibull distribution types are
Accurate Calculation of very High Divergent Electric Fields of High Voltage Systems.(Dept. E)
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A85TRA CT-The calculation of very high divergent electric fields plays a dominant role for the full understanding of the breakdown mechanisms in the high voltage engineering. Approximate calculation methods lead to a false dim ensioning of the insulating
A dual-switch cubic SEPIC converter with extra high voltage gain
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To provide a high votage conversion ratio, conventional non-isolated DC-DC boost topologies, which have reduced voltage boost capability, have to operate with extremely high duty cycle ratio, higher than 0.9. This paper proposes a DC-DC converter which is
Use of Aluminosilicate Residue from Insulators of High Voltage Transformers for the Adsorption of Basic Dyes
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In this study, an aluminosilicate residue from insulators of high voltage transformers was used for the adsorption of basic dyes. The absorbent was characterized by X-ray fluorescence analysis, X-ray diffraction analysis, scanning electron microscopyA new type of non-isolated step-up converter with high voltage gain is proposed on this work. It is suitable for applications with a high voltage gain between the input and the output stages. In this converter, the output to input voltage ratio, for a given duty cycle, can be
WEED CONTROL USING HIGH VOLTAGE ELECTRICITY
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The Weed Zapper provided greater than 80% waterhemp (primary stem) control, 14 days after treatment (DAT). Kochia (highly branched stem) control 14 DAT was less. 2. Operating speed did not influence waterhemp control (Univ of Missouri research). 3. One pass across This paper compares two models describing electroluminescence under AC stress in order to gain a better understanding on the interfacial processes, responsible for light emission. Simulated data is also compared with electroluminescence measurements for LDPE
ISSCC 2021/SESSION 33/ HIGH VOLTAGE GaN AND WIRELESS POWER/33.2
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Wide-band-gap power devices hold great promise for creating power-conversion systems that are smaller, faster and more energy efficient than silicon power devices. Benefiting from smaller parasitic capacitors and superior conductive characteristics of gallium-nitride (GaN)
Harmonic Analysis Comparison between PV Integration in High Voltage and Medium Voltage Networks
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Integration of large-scale renewable energy (RE) sources in particular, photovoltaic (PV) sources into the electric grid introduces current and voltage harmonics due to power electronics devices as well as inverter connected into the RE sources. Ensuring adequate
Exploration of High voltage Outdoor Insulations A Review Based on Field Study
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In present era, a world without electric current is unimaginable. Transportation of electric current from power source to home appliances entails more equipment like generators, transformers, overhead lines, power cables etc. These equipment generally operate at high
Metaheuristic Based Solution for the Non-Linear Controller of the Multiterminal High Voltage Direct Current Networks. Energies 202 1 1578
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The purpose of this study is to improve the PI controllers of the voltage-source converters (VSC)-based multiterminal high voltage direct-current (MT-HVDC) networks. Since the VSCs are the non-linear elements of the MT-HVDC stations, the classical optimization methodsUnder operating conditions effect, insulated power cables can undergo critical degradations. Ultraviolet (UV) radiations are one of the most destructive constraints which affect the properties of the material used for insulation. Because of its good properties, crosslinked
Strengthen Leaching Effect of Carlin-type Gold via High voltage Pulsed Discharge Pretreatment
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High voltage pulsed discharge (HVPD) pretreatment was applied to strengthen the leaching effect of Carlin-type gold ore containing arsenic in this work. The optimal results of pretreatment experiments was obtained at the operating conditions of spherical gap spacing
EFFECT OF HIGH VOLTAGE PULSED GALVANIC STIMULATION FOR CONSTIPATION IN ACUTE STROKE A RANDOMIZED CLINICAL TRIAL
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ABSTRACT BACKGROUND: Constipation is a common symptom among patients with Acute Stroke leading to increased morbidity and mortality. It is associated with increased length of hospital stay, poor neurological outcome and development of more complications. This can
Economical Direct Feeding of Far-Distance Zones from High Voltage Transmission Lines.(Dept. E)
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This paper presents a mathematical model of economical sources for capacitive take-off power network. Also, the paper illustrates the comparison between transformers data and power take-off capacitauce frona HVTL (220kV). This indicates that the sarne results of
Optimization of Thermal Backfill Configurations for Desired High Voltage Power Cables Ampacity. Energies 202 1 1452
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The ampacity of high voltage power cables depends, among others, on their core crosssectional area as well as thermal resistivity of the thermal backfill surrounding the cables. The cross-sectional area of the power cables core is selected according to the
High voltage power transformer condition assessment considering the health index value and its decreasing rate
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A health index method is a useful tool for the transformer assessment condition. This method has been used in several previous studies. However, most of them have not observed the health index decreasing rate as an aspect to improve the transformer condition assessment
High-Frequency High VoltageConversion-Ratio DC/DC Converters
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Recently, high-frequency power electronics technology has developed rapidly, which helps to improve power density and dynamic response. Among high-frequency DC/DC converters, the high-frequency high voltageconversion-ratio DC/DC converters are widely adopted in
Impedance correction method of distance relay on high voltage transmission line
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A distance protection relay plays a major role in faults detection in the electric transmission line. The fault resistance has an effect on the fault location line and therefore the operation of a distance protection relay is not reliable. When a fault occurs in a transmission line, the
Analysis of light emission and schlieren from short gap high voltage streamer impulses representing lightning
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Light emissions and schlieren structures were simultaneously observed from streamers produced by tens of kilovolts 1.2/50 µs impulses, representing the high voltage component of lightning, applied across a 4 cm air gap between a variety of electrode geometries and a
State of Research on Effects of Cloud to Ground Lightning Transients on High Voltage Polymeric Insulated Power Cables
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Lightning continues to possess threats to the reliable supply of electrical energy by causing damages to electrical equipment. Lightning transient causes outages either by directly hitting electrical equipment or by the electromagnetic interference induced by it upon hitting
Insulating MgO-Al2O3-LDPE Nanocomposites for Offshore High Voltage DC Insulations
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Polymer-metal oxide nanocomposite is a key in developing a high temperature insulation material for power electronics and HVDC and MVDC subsea cables having capability of transmitting offshore renewable energy with lower losses and higher reliability. To achieve
REDESIGN OF THE JEFFERSON LAB-300 kV DC PHOTO-GUN FOR HIGH BUNCH CHARGE OPERATIONS
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High bunch charge (a few nC) electron beam studies at Jefferson Lab using an inverted insulator DC high voltage photo-gun showed evi- dence of space charge limitations starting at 0.3 nC, limit- ing the maximum delivered bunch charge to 0.7 nC for beam at225 kV, 75 ps
Review Forvarious Parameters Of Transient Recovery Voltage Envelope
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An equal infusion of short out current and transient voltage to medium and high voltage circuit breaker (CB) by a synthetic model is contemplated. Transient recovery voltage is made by a capacitor bank and is applied to CB
New transformer‐less DC DC converter topologies with reduced voltage stress on capacitors and increased voltage conversion ratio
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The proposed structures are more suitable for modern applications in which it is desirable to achieve high voltage gains by using non-extreme duty-cycles. For proving the analysis and claims, the detailed comparison and experimental results are presented
A non‐isolated high step‐up DC DC converter using magnetic coupling and voltage multiplier circuit
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Abstract This paper introduces a new DC DC structure with a high voltage gain Unfortunately, the PV panels voltage level is very low, and for high voltage applications, these panels should be con- nected in series and parallel configurations
Oil‐paper insulation partial discharge ultrasonic multifrequency sensing array based on fibre‐optic Fabry Perot sensor
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In order to improve the sensitivity and accuracy of oil‐paper insulation partial discharge detection by the fibre‐optic Fabry Perot (FP) ultrasonic sensor, this work studied the ultrasonic signals frequency characteristics of typical oil‐paper insulation partial discharges
INVESTIGATION OF OZONE SYNTHESIS IN THE NEGATIVE PULSED CORONA DISCHARGE IN OXYGEN AT THE COMBINED SUPPLY VOLTAGE
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supply voltage. Due to the combined power supply, high voltage can be applied to the interelectrode gap during the discharge breakdown and can be completely or partially removed during the channel relaxation. The matter
Surface discharge imaging in presence of deposited space charges in non‐uniform DC electric field
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An investigation is made of the influence of an accumulated charge sprinkled on the surface of an epoxy resin plate in corona mode on partial discharge inception and its forms as analyzed by optical imaging at DC voltage. The effects of the polarities of both the depositedThe converter has many advantages such as high voltage gain, non-inverting output, continuous input current, high efficiency and lower voltage stress on the switches. Moreover, high voltage gain is achieved without using any