free -electrical engineering-high voltage
DESIGN CONSIDERATIONS FOR HIGH VOLTAGE HIGHPOWER FULL-BRIDGE ZERO- VOLTAGE ~ SWlTCllED PWM CONVERTER
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The paper presents a steady-stale analysis with complete charac-terization of the converter operation. A small-signal model of the mn-verter is established. The design procedures based on the analysis are presented and the various losses in the circuit ar\essed. Critical
Corona performance of high voltage transmission lines
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TABLE OF CONTENTS Page PREFACE xiii ACKNOWLEDGEMENT xvU PART 1. BASIC CONCEPTS 1. High Voltage Power Transmission 3 1.1 Electric Power Systems v 3 1.2 High Voltage AC Transmission Lines 4 1.2.1 History of Development 4 1.2.2 Power Transfer Capability 5 1.2.3 Line Configurations
High voltage direct current (HVDC) transmission systems technology review paper
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R Rudervall, JP Charpentier, R Sharma- Energy week 171.67.100.116 Beginning with a brief historical perspective on the development of High Voltage Direct Current (HVDC) transmission systems, this paper presents an overview of the status of HVDC systems in the world today. It then reviews the underlying technology of HVDC The insulation of components and devices in high voltage technology is of vital importance and is often the decisive factor in design and construction. Knowledge of the physical processes which limit the electric strength of an arrangement is essential for economical High voltage (HV) test and measuring techniques are considered in most general HV text books (eg Kuechler 2009; Kuffel et al. 2007; Beyer et al. 1986; Mosch et al. 1988; Schufft et al. 2007; Arora and Mosch 2011). There are teaching books on HV test techniques for
Action potential waveform voltageclamp commands reveal striking differences in calcium entry via low and high voltage activated calcium channels
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Calcium channels transduce natural voltage transients, like action potentials, into functionally important intracellular calcium transients. We have used digitally constructed waveforms that simulate natural action potentials as voltageclamp commands to study
contacts of chick fibroblasts and their relation to the microfilament system. A correlated interference-reflexion and high voltage electron-microscope study
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The interference reflexion microscope be used to examine the pattern of cell- substratum separation of cultured cells. Earlier studies on chick fibroblasts using this technique identified 3 types of separation:(1) focal contacts, representing approx. 10-14 nm
Fiber-optic current and voltage sensors for high voltage substations
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ABB Switzerland Ltd, Corporate Research, CH-5405 Baden-Dättwil, Switzerland Phone: +41 58 586 804 Fax: +41 58 586 735 E-mail: klaus.bohnert@ch.abb.com Aftab Khan ABB Inc, 100 Distribution Circle, Mount Pleasant, PA 1566 USA We report on ABBs fiber-optic
Inactivation of microorganisms by pulsed high voltage application
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As one of the applications of pulsed high voltage technology to the liquid, destruction of living cells in liquid has been investigated in attempts to sterilize drinking liquids. The survivability of the cells and the energy efficiencyof cell destructionfor some speciesof cells
Polymer nanocomposites in high voltage electrical insulation perspective: a review
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Polymer nanocomposites have attracted wide interests in various industries. This new class of material is capable of providing significant improvements in combined electrical, thermal and mechanical properties. Although the potential use of polymer nanocomposites in
Do high voltage pulses cause changes in skin structure
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Dramatic changes in skin properties are caused by high voltage pulses (eg. 100 V) of millisecond duration. The exact mechanism by which these changes occur remains unresolved. but result from alterations of skin structure, possibly involving
Epoxy Based Nanodielectrics for High Voltage DC-Applications: Synthesis, Dielectric Properties and Space Charge Dynamics
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There are two big frontiers on opposite sides of the size spectrum in the 21st century. Space exploration is on one end of the spectrum. The other side of the spectrum is the exploration of the nanoscale. In both cases we have limitations of how much of it we can see, even with
High voltage test techniques: partial discharge measurements
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From 1 January 199 all IEC publications have the number 60000 added to the old number. For instance, IEC 27-1 has been renumbered as IEC 60027-1. For a period of time during the change over from one numbering system to the other, publications contain
High voltage GaN HEMTs with low on-resistance for switching applications
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Power semiconductor devices play a crucial role in the regulation and distribution of power and energy in the world. By some estimates, more than 60 percent of all the power utilized in the United States flows through at least one power device . The market for power discrete
Physical security of the US power grid: high voltage transformer substations
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Summary In the United States, the electric power grid consists of over 200,000 miles of high voltage transmission lines interspersed with hundreds of large electric power transformers. High voltage (HV) transformer units make up less than 3% of transformers in US power
Efficient removal of phenol from aqueous solution by the pulsed high voltage discharge process in the presence of H2O2
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This study investigates the phenol degradation by pulsed high voltage discharge (PHVD). The effect of solution pH, temperature, treatment time and initial phenol concentration on phenol degradation were examined. The results showed that the phenol removal efficiency was increased with the
Ultra high voltage transmission
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From the advent of electrical transmission, AC has established itself as leading technology in electrical networks. Its advantage lay in the possibility of using transformers to raise it to higher voltage levels, facilitating economical transmission. Both AC and DC generators
Mass production of high voltage GaAs and GaN devices
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We have developed 28V-operation high voltage GaAs and 50V-operation GaN devices and successfully moved to massproduction. Our flexible wafer process line utilizing Light-Wave products process line can handle small size SiC wafers the same as the matured 4-inch
Using high voltage electrical stimulation in the treatment of recalcitrant pressure ulcers: results of a randomized, controlled clinical study
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The use of electrical stimulation has been studied in a variety of wounds emphasizing different variables with regard to provision of therapy. The purpose of this prospective, randomized, controlled clinical study was to evaluate the effect of high voltage electrical
Acute childhood leukemias and exposure to magnetic fields generated by high voltage overhead power lines-a risk factor in Iran
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Many investigators have studied the effects of Extremely Low Frequency-Magnetic Fields generated by ordinary and domestic power lines, as a risk factor in acute leukaemias of children, but there are limited information available regarding very high voltage overhead CSE PROJECTS