Bibliographies thématiques / Current voltage and power voltage characteristics

Littérature scientifique sur le sujet « Current voltage and power voltage characteristics »

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Publié le 11 mars 2023

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Articles de revues sur le sujet "Current voltage and power voltage characteristics"

Qasim, Ahmed, Fadhil Tahir et Ahmed Alsammak. « Voltage Sag, Voltage Swell and Harmonics Reduction Using Unified Power Quality Conditioner (UPQC) Under Nonlinear Loads ». Iraqi Journal for Electrical and Electronic Engineering 17, n^o 2 (19 septembre 2021) : 140–50. http://dx.doi.org/10.37917/ijeee.17.2.16.

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In light of the widespread usage of power electronics devices, power quality (PQ) has become an increasingly essential factor. Due to nonlinear characteristics, the power electronic devices produce harmonics and consume lag current from the utility. The UPQC is a device that compensates for harmonics and reactive power while also reducing problems related to voltage and current. In this work, a three-phase, three-wire UPQC is suggested to reduce voltage-sag, voltage-swell, voltage and current harmonics. The UPQC is composed of shunt and series Active Power Filters (APFs) that are controlled utilizing the Unit Vector Template Generation (UVTG) technique. Under nonlinear loads, the suggested UPQC system can be improved PQ at the point of common coupling (PCC) in power distribution networks. The simulation results show that UPQC reduces the effect of supply voltage changes and harmonic currents on the power line under nonlinear loads, where the Total Harmonic Distortion (THD) of load voltages and source currents obtained are less than 5%, according to the IEEE-519 standard.

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Islam, Mirwazul, et Grigory Simin. « Compact Model for Current Collapse in GaN-HEMT Power Switches ». International Journal of High Speed Electronics and Systems 25, n^o 01n02 (mars 2016) : 1640001. http://dx.doi.org/10.1142/s0129156416400012.

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We present a simple yet accurate model describing current-voltage characteristics of GaN-HEMT power switches in presence of carrier trapping often referred to as current collapse. The model accounts for time-dependent changes in the source-gate and gate-drain resistances after application of high drain voltage. The model also has a regime describing ‘fast’ current voltage characteristics when the applied voltage swing occurs within a period of time much shorter than the characteristic trapping – detrapping times. The model is written in Verilog-A and can be implemented in SPICE-type circuit simulators.

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Odzaev, Vladimir B., Aliaksandr N. Pyatlitski, Uladislau S. Prasalovich, Natalya S. Kovalchuk, Yaroslav A. Soloviev, Dmitry V. Shestovski, Valentin Yu Yavid et Yuri N. Yankovski. « Electrophysical characteristics of power MOSFETs additionally implanted with nitrogen ions ». Journal of the Belarusian State University. Physics, n^o 3 (29 septembre 2022) : 81–92. http://dx.doi.org/10.33581/2520-2243-2022-3-81-92.

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The electrical characteristics of power MOSFETs additionally implanted with nitrogen ions have been studied. Ion implantation of nitrogen was carried out through a protective oxide of 23 nm thickness with energies of 20 and 40 keV and doses of 1 ⋅ 1013‒5 ⋅ 1014 cm–2. Rapid thermal annealing was carried out at temperature of 900 or 1000 °C for 15 s. It has been established that nitridisation of the gate dielectric makes it possible to reduce the noise of the gate leakage currents and their dispersion. In the direct order of heat treatment (first rapid thermal annealing, and then the removal of the protective oxide), for samples prepared with an additional operation of nitrogen ion implantation, there is an increase in the threshold voltage compared to control samples. The capacitance of the gate dielectric in the case of implantation of nitrogen ions in the direct order of heat treatment is less than for control samples. It has been established that in the direct order of rapid thermal annealing, the doses of nitrogen ion implantation do not cause significant changes in the maximum value of the current-voltage slope. At the same time, in all studied cases, there is a shift in the maximum value of the current-voltage slope towards higher gate voltages. In the reverse order of heat treatment (first the removal of the protective oxide, and then rapid thermal annealing), there are no significant differences in the value of the threshold voltage for the samples created with additional nitrogen implantation and the control ones. The maximum value of the current-voltage slope also does not experience significant changes. It is shown that in the voltage range from – 0.15 to 0 V, the drain current of nitrogen-implanted samples manufactured using the direct order of heat treatment is higher than for control samples, and the drain current of nitrogen-implanted samples obtained with the reverse order of heat treatment it is lower compared to control samples. Results are explained by a decrease in the density of surface states at the Si – SiO2 interface in MOS-structures created using an additional operation of nitrogen ion implantation in the direct order of heat treatment.

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Shim, Yo-Shep. « Electrical Characteristics of Underwater Human Body Model in Charging Power Facility ». Korean Society of Technical Education and Training 25, n^o 3 (30 septembre 2020) : 25–31. http://dx.doi.org/10.29279/kostet.2020.25.3.25.

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In this study, the electrical simulation of electric shock accidents at a voltage of 220 V was investigated using Andrew s body model in water. The constructed circuit consisted of Andrew s body model. The voltages measured on a hand, breast, waist, were compared with the electric currents measured on the hand, breast, and waist considering the safety limit of an electric current passing through the body. From the results, it can be understood that the magnitude and wave of electric current passing through the body affect the heart s control of a signal, which directly affects the ventricle of the heart in detail. It comes from the simulation through the ATP -Draw program. This study could be useful in solving safety issues for the electric angle limit by measuring flooding body resistance, as well as the voltage and current passing through each part.

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Matsuda, Takuma, Takashi Yokoseki, Satoshi Mitomo, Koichi Murata, Takahiro Makino, Hiroshi Abe, Akinori Takeyama et al. « Change in Characteristics of SiC MOSFETs by Gamma-Ray Irradiation at High Temperature ». Materials Science Forum 858 (mai 2016) : 860–63. http://dx.doi.org/10.4028/www.scientific.net/msf.858.860.

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Radiation response of 4H-SiC vertical power Metal-Oxide-Semiconductor Field Effect Transistors (MOSFETs) was investigated at 150°C up to 10.4 MGy. Until irradiation at 1.2 MGy, the drain current – gate voltage curves of the SiC MOSFETs shifted to the negative voltage side, and the leakage of drain current at gate voltages below threshold voltage increased with increasing absorbed dose. However, no significant change in the electrical characteristics of SiC MOSFETs was observed at doses above 1.2 MGy. For blocking characteristics, there were no degradations of the SiC MOSFETs irradiated at 150°C even after irradiated at 10.4 MGy.

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Cho, Min Su, Hye Jin Mun, Sang Ho Lee, Hee Dae An, Jin Park, Jaewon Jang, Jin-Hyuk Bae et In Man Kang. « Design and Analysis of DC/DC Boost Converter Using Vertical GaN Power Device ». Journal of Nanoscience and Nanotechnology 21, n^o 8 (1 août 2021) : 4320–24. http://dx.doi.org/10.1166/jnn.2021.19395.

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In this study, a high-performance vertical gallium nitride (GaN) power transistor is designed by using two-dimensional technology computer-aided design simulator. The vertical GaN transistor is used to analyze the DC/DC boost converter. The systems requiring high voltages of 1000 V or more, such as electric vehicles, need wide devices to achieve a high breakdown voltage when using conventional power devices. However, vertical GaN transistors can be fabricated with small device area and high breakdown voltage. The proposed device has an off-current of 4.72×10−10 A/cm2, an on-current of 17,528 A/cm2, and a high breakdown voltage of 1,265 V due to good gate controllability and the very long gate-to-drain length. Using the designed device, a boost converter that doubles the input voltage was constructed and is characteristics were examined. The designed boost converter obtained an output voltage of 1,951 V and the voltage conversion efficiency was considerably high at 97.55% when the input voltage was 1,000 V.

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Bolaño Martínez, Adrián, Isaac Jimenez Navarro, Vladimir Sousa Santos, Enrique Ciro Quispe et Pablo Daniel Donolo. « MATLAB/Simulink modeling of electric motors operating with harmonics and unbalance ». International Journal of Electrical and Computer Engineering (IJECE) 12, n^o 5 (1 octobre 2022) : 4640. http://dx.doi.org/10.11591/ijece.v12i5.pp4640-4648.

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This paper aims to present a simulation model for the analysis of the operational characteristics of electric motors (EMs). The model was developed on the Simulink platform of the MATLAB program and allows analysis in supply conditions with harmonics and voltage unbalance. The contribution of the model is that it considers the mechanical losses and provides for the study of the effect of each component of the electrical sequence of the harmonics and the voltage unbalance on the electromechanical characteristics of the EM. The model developed was tested in a 37.3 kW EM, operating under four power supply conditions: balanced sinusoidal voltages, balanced non-sinusoidal voltages (i.e., harmonics), unbalanced sinusoidal voltages, and non-sinusoidal unbalanced voltages. The results showed that under the conditions of harmonics and unbalance, the efficiency was reduced by 2%, respectively and that with the combined effects, the efficiency decreased by 4%. The results made it possible to quantify, from the current, voltage, and electrical power values of each sequence, the adverse effects caused by voltage unbalance and harmonics.

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Chen, Jinlei, Sheng Wang, Carlos E. Ugalde-Loo, Wenlong Ming, Oluwole D. Adeuyi, Salvatore D’Arco, Salvador Ceballos et al. « Demonstration of Converter Control Interactions in MMC-HVDC Systems ». Electronics 11, n^o 2 (6 janvier 2022) : 175. http://dx.doi.org/10.3390/electronics11020175.

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Although the control of modular multi-level converters (MMCs) in high-voltage direct-current (HVDC) networks has become a mature subject these days, the potential for adverse interactions between different converter controls remains an under-researched challenge attracting the attention from both academia and industry. Even for point-to-point HVDC links (i.e., simple HVDC systems), converter control interactions may result in the shifting of system operating voltages, increased power losses, and unintended power imbalances at converter stations. To bridge this research gap, the risk of multiple cross-over of control characteristics of MMCs is assessed in this paper through mathematical analysis, computational simulation, and experimental validation. Specifically, the following point-to-point HVDC link configurations are examined: (1) one MMC station equipped with a current versus voltage droop control and the other station equipped with a constant power control; and (2) one MMC station equipped with a power versus voltage droop control and the other station equipped with a constant current control. Design guidelines for droop coefficients are provided to prevent adverse control interactions. A 60-kW MMC test-rig is used to experimentally verify the impact of multiple crossing of control characteristics of the DC system configurations, with results verified through software simulation in MATLAB/Simulink using an open access toolbox. Results show that in operating conditions of 650 V and 50 A (DC voltage and DC current), drifts of 7.7% in the DC voltage and of 10% in the DC current occur due to adverse control interactions under the current versus voltage droop and power control scheme. Similarly, drifts of 7.7% both in the DC voltage and power occur under the power versus voltage droop and current control scheme.

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Bolshanyn, G. A. « EQUIVALENTS OF THE PASSIVE EIGHT-EARTH POLAR WITH THREE INPUT AND FIVE OUTPUT CONCLUSIONS ». Proceedings of the higher educational institutions. ENERGY SECTOR PROBLEMS 20, n^o 9-10 (24 janvier 2019) : 109–19. http://dx.doi.org/10.30724/1998-9903-2018-20-9-10-109-119.

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Eight-poles of various designs, including an eight-terminal network with three input and five output terminals, are needed to replace some power objects. Especially when only the input and output characteristics of electrical energy are of interest. The paper presents the eightterminal network equations with three input and five output terminals, establishing a connection between these characteristics. Equations of the A-form establish a connection between the input and output voltages and currents; the B-form equations establish a connection between the output and input voltages and currents; G-form equations establish a connection between the input current, output voltages and output voltage, output currents; H-form equations establish the relationship between the input voltage, output currents and output current, output voltages; the Yform equations establish a connection between the input and output currents and the input and output voltages; The Z-form equations establish the relationship between the input and output voltages and the input and output currents. When implementing these equations, attention should be paid to the difference in the directions of the currents in each individual case.

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Sultanov, M. M., A. V. Strijichenko et S. A. Yanchenko. « Analysis of the impact of non-sinusoidal voltage levels in the power grid of apartment buildings on the reliability and efficiency of transformers ». Safety and Reliability of Power Industry 15, n^o 4 (9 février 2023) : 278–83. http://dx.doi.org/10.24223/1999-5555-2022-15-4-278-283.

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The effects of mass implementation of energy-saving lighting on the permissible level of loading of the supply transformer were analyzed. The influence of non-sinusoidal voltages and currents on transformer wear was analyzed. Distortions of sinusoidal shape of voltages and currents lead to additional power losses in transformer. They cause heating of the insulation and windings of the transformer, increased losses and accelerated wear and tear. Higher harmonic components of voltage and current in a 0.4 kV network are caused by the presence of various energy-saving lighting lamps with non-linear volt-ampere characteristic, which include compact fluorescent and LED light sources. As a result, the transformer designed to operate at a frequency of 50 Hz experiences an additional adverse effect in the form of power losses and accelerated wear of electrical insulation, which leads not only to the deterioration of its technical and economic performance characteristics, but also to a significant decrease in reliability associated with the influence of higher harmonic components of voltage and current on equipment failure. It is shown that the lack of power factor correction schemes for low-power compact fluorescent and LED lamps causes the growth of nonsinusoidal voltage and current as they spread, which in turn causes the need to adjust the limit load of transformers to ensure their rated thermal mode. One way to maintain operational reliability under such conditions is to limit the transformer load depending on the level of higher harmonics in the network, as well as to predict the residual life of the operating transformer. Measuring the values of current transformer load and current levels of higher harmonic components of voltage and current will allow not only to calculate an acceptable load factor of the transformer (for the condition of insulation wear), but also to estimate the current residual life of transformer equipment using a neural network model.

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Thèses sur le sujet "Current voltage and power voltage characteristics"

Svrček, Milan. « Metody pro dosažení maximálního výkonu FV modulů ». Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2017. http://www.nusl.cz/ntk/nusl-318171.

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This diploma thesis deals with the tracking of the maximum power point for photovoltaic panels and the methods used to achieve it. On this basis, two methods were designed and programmed and subsequently tested on three types of photovoltaic panels. In conclusion methods were appraised.

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Ghasemi, Negareh. « Improving ultrasound excitation systems using a flexible power supply with adjustable voltage and frequency to drive piezoelectric transducers ». Thesis, Queensland University of Technology, 2012. https://eprints.qut.edu.au/61091/1/Negareh_Ghasemi_Thesis.pdf.

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The ability of a piezoelectric transducer in energy conversion is rapidly expanding in several applications. Some of the industrial applications for which a high power ultrasound transducer can be used are surface cleaning, water treatment, plastic welding and food sterilization. Also, a high power ultrasound transducer plays a great role in biomedical applications such as diagnostic and therapeutic applications. An ultrasound transducer is usually applied to convert electrical energy to mechanical energy and vice versa. In some high power ultrasound system, ultrasound transducers are applied as a transmitter, as a receiver or both. As a transmitter, it converts electrical energy to mechanical energy while a receiver converts mechanical energy to electrical energy as a sensor for control system. Once a piezoelectric transducer is excited by electrical signal, piezoelectric material starts to vibrate and generates ultrasound waves. A portion of the ultrasound waves which passes through the medium will be sensed by the receiver and converted to electrical energy. To drive an ultrasound transducer, an excitation signal should be properly designed otherwise undesired signal (low quality) can deteriorate the performance of the transducer (energy conversion) and increase power consumption in the system. For instance, some portion of generated power may be delivered in unwanted frequency which is not acceptable for some applications especially for biomedical applications. To achieve better performance of the transducer, along with the quality of the excitation signal, the characteristics of the high power ultrasound transducer should be taken into consideration as well. In this regard, several simulation and experimental tests are carried out in this research to model high power ultrasound transducers and systems. During these experiments, high power ultrasound transducers are excited by several excitation signals with different amplitudes and frequencies, using a network analyser, a signal generator, a high power amplifier and a multilevel converter. Also, to analyse the behaviour of the ultrasound system, the voltage ratio of the system is measured in different tests. The voltage across transmitter is measured as an input voltage then divided by the output voltage which is measured across receiver. The results of the transducer characteristics and the ultrasound system behaviour are discussed in chapter 4 and 5 of this thesis. Each piezoelectric transducer has several resonance frequencies in which its impedance has lower magnitude as compared to non-resonance frequencies. Among these resonance frequencies, just at one of those frequencies, the magnitude of the impedance is minimum. This resonance frequency is known as the main resonance frequency of the transducer. To attain higher efficiency and deliver more power to the ultrasound system, the transducer is usually excited at the main resonance frequency. Therefore, it is important to find out this frequency and other resonance frequencies. Hereof, a frequency detection method is proposed in this research which is discussed in chapter 2. An extended electrical model of the ultrasound transducer with multiple resonance frequencies consists of several RLC legs in parallel with a capacitor. Each RLC leg represents one of the resonance frequencies of the ultrasound transducer. At resonance frequency the inductor reactance and capacitor reactance cancel out each other and the resistor of this leg represents power conversion of the system at that frequency. This concept is shown in simulation and test results presented in chapter 4. To excite a high power ultrasound transducer, a high power signal is required. Multilevel converters are usually applied to generate a high power signal but the drawback of this signal is low quality in comparison with a sinusoidal signal. In some applications like ultrasound, it is extensively important to generate a high quality signal. Several control and modulation techniques are introduced in different papers to control the output voltage of the multilevel converters. One of those techniques is harmonic elimination technique. In this technique, switching angles are chosen in such way to reduce harmonic contents in the output side. It is undeniable that increasing the number of the switching angles results in more harmonic reduction. But to have more switching angles, more output voltage levels are required which increase the number of components and cost of the converter. To improve the quality of the output voltage signal with no more components, a new harmonic elimination technique is proposed in this research. Based on this new technique, more variables (DC voltage levels and switching angles) are chosen to eliminate more low order harmonics compared to conventional harmonic elimination techniques. In conventional harmonic elimination method, DC voltage levels are same and only switching angles are calculated to eliminate harmonics. Therefore, the number of eliminated harmonic is limited by the number of switching cycles. In the proposed modulation technique, the switching angles and the DC voltage levels are calculated off-line to eliminate more harmonics. Therefore, the DC voltage levels are not equal and should be regulated. To achieve this aim, a DC/DC converter is applied to adjust the DC link voltages with several capacitors. The effect of the new harmonic elimination technique on the output quality of several single phase multilevel converters is explained in chapter 3 and 6 of this thesis. According to the electrical model of high power ultrasound transducer, this device can be modelled as parallel combinations of RLC legs with a main capacitor. The impedance diagram of the transducer in frequency domain shows it has capacitive characteristics in almost all frequencies. Therefore, using a voltage source converter to drive a high power ultrasound transducer can create significant leakage current through the transducer. It happens due to significant voltage stress (dv/dt) across the transducer. To remedy this problem, LC filters are applied in some applications. For some applications such as ultrasound, using a LC filter can deteriorate the performance of the transducer by changing its characteristics and displacing the resonance frequency of the transducer. For such a case a current source converter could be a suitable choice to overcome this problem. In this regard, a current source converter is implemented and applied to excite the high power ultrasound transducer. To control the output current and voltage, a hysteresis control and unipolar modulation are used respectively. The results of this test are explained in chapter 7.

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Шевченко, Сергій Юрійович. « Вплив вищих гармонік напруги на вибір та експлуатацію обмежувачів перенапруг для захисту систем електропостачання ». Thesis, НТУ "ХПІ", 2015. http://repository.kpi.kharkov.ua/handle/KhPI-Press/18478.

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Дисертація на здобуття наукового ступеня доктора технічних наук за спецiальністю 05.09.03 - електротехнiчнi комплекси та системи. - Національний технічний університет "Харківський політехнічний інститут". Харків 2015 р. Дисертація присвячена актуальній науково-технічній проблемі визначення пливу вищих гармонік напруги на вибір та експлуатацію обмежувачів перенапруг для захисту електротехнічних комплексів та систем, що має важливе значення та забезпечує підвищення ефективності та надійності функціонування систем електропостачання. В рамках даного напряму отримані наступні результати. Виконано аналіз існуючих вимог до вибору та експлуатації перенапруг нелінійних (ОПН) в системах електропостачання різних класів напруги; Проведено експериментальні дослідження електрофізичних характеристик варисторів та ОПН в зібраному стані провідних світових виробників при різних частотах прикладеної напруги та вольт амперних характеристик варисторів і ОПН в зібраному стані в зоні струмів витоку. Удосконалено математичну модель для вибору енергетичних характеристик ОПН при низькій якості електричної енергії в системі електропостачання на базі схем заміщення ОПН в зоні струмів витоку їх вольт-амперної характеристики (ВАХ). Запропановано метод визначення втрат активної потужності в ОПН на базі отриманих ВАХ в зоні струмів витоку, та проведено аналіз впливу несинусоїдальності напруги на величину енергії, що діє на ОПН, а також визначено вплив на нормальну роботу ОПН перенапруг грозового і комутаційного імпульсів струму та підвищеної напруги промислової частоти. Розроблено методи визначення ВАХ ОПН в зоні струмі витоку на основі отриманих експериментальних ВАХ ОПН, які базуються на нейронних мережах та апроксимацією ВАХ двома кривими першого порядку. Удосконалено математичну модель теплових режимів ОПН при низькій якості електричної енергії в системі електропостачання та виконані дослідження впливу різних чинників на теплову стабільність ОПН. Експериментально досліджено наявність порушень якості електричної енергії в системах електропостачання різних видів промисловості України. Удосконалено методи вибору ОПН в системах електропостачання різних номінальних напруг з низькою якістю електричної енергії. Сформульовані основні засади застосування та експлуатації ОПН при впливі вищіх гармонік напруги. Обгрунтовано використання тепловізорів та пірометрів для експлуатаційного контролю стану ОПН.
The thesis for the degree of doctor of technical sciences, specialty 05.09.03 - Electrotechnical complexes and systems. - National Technical University "Kharkiv Polytechnic Institute". Kharkov 2015. Dissertation is devoted to actual scientific and technical problem of determining the effect of the higher harmonics of the voltage on the selection and exploitation of surge arresters for protection electricity supply systems is important and enhances the efficiency and reliability of power supply systems. In this area, the following results. The analysis of existing requirements for the selection and exploitation of surge arresters in electricity supply systems of different voltage classes. Experimental studies of electrophysical characteristics of varistors and surge arresters assembled the world's leading manufacturers in the different frequencies of the applied voltage and current voltage characteristics of varistors and surge arresters in an assembled state in the area of leakage current. Іmproved the mathematical model for selecting the energy characteristics of the arrester at a low power quality in the power supply system on the basis of equivalent circuits in the area of the arrester leakage current of the current-voltage characteristics (CVC). Offered the method for determination of active power losses in the arrester on the basis of the obtained current-voltage characteristics in the area of leakage current and the analysis of the impact of non-sinusoidal voltage to the amount of energy exerted on surge arresters, as well as determined the effect of the normal operation of surge arresters Surge lightning and switching current pulses and high frequency voltage. Developed the methods for determining the current-voltage characteristics in the area of the arrester leakage current on the basis of the experimental CVC arresters based on neural networks and approximation CVC two curves of the first order. Іmproved the mathematical model of thermal modes of surge arresters in low power quality in the power supply system and to study the effect of different factors on the thermal stability of the arrester. Experimentally investigated for poor quality of electricity supply systems of various types of industry of Ukraine; An improved method for selecting surge arresters in power supply systems of different rated voltages with low quality electric energy. Іmproved the basic principles for the use and operation of surge arresters under the influence of higher harmonic voltage. Justify the use of thermal imagers and pyrometers for operational monitoring of the arrester.

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Massi, Pavan Alessandro. « A hardware field simulator for photovoltaic materials applications ». Doctoral thesis, Università degli studi di Trieste, 2008. http://hdl.handle.net/10077/2757.

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2006/2007
Il presente lavoro riguarda la descrizione di un simulatore di campo fotovoltaico (in seguito simulatore). Il simulatore è un convertitore elettronico di potenza che, alimentato dalla rete elettrica, riproduce la caratteristica tensione corrente di un campo fotovoltaico (insieme di moduli fotovoltaici connessi in serie e in parallelo) operante in condizioni climatiche di temperatura e irraggiamento arbitrarie. Il nuovo dispositivo verrà impiegato nell’ambito del laboratorio fotovoltaico cui fa riferimento l’impianto in via di realizzazione sul tetto dell’edificio che ospita il Dipartimento dei Materiali e delle Risorse Naturali dell’Università di Trieste. Il simulatore viene proposto come utile strumento per i progettisti di dispositivi solari funzionanti in sistemi fotovoltaici connessi in rete. In particolare, il simulatore permetterà di prevedere il funzionamento di nuovi moduli fotovoltaici operanti in condizioni di ombreggiamento arbitrario e inseriti in un sistema fotovoltaico reale. L’uso del simulatore sarà particolarmente efficace nel caso di simulazioni di tecnologie in film sottile come, ad esempio, il silicio amorfo, il tellururo di cadmio, ecc. Il simulatore sarà anche necessario per testare i componenti che fanno parte di un sistema fotovoltaico connesso in rete, con particolare riferimento ai sistemi di condizionamento della potenza (detti anche inverter). Tali sistemi, oltre a convertire la tensione continua prodotta dai moduli fotovoltaici in una tensione compatibile e sincronizzata con quella della rete, devono garantire istante per istante l’inseguimento del punto di massima potenza estraibile dal campo fotovoltaico cui sono connessi. Il lavoro è stato suddiviso in cinque capitoli. Il primo capitolo fornisce una breve descrizione dello stato dell’arte e di alcune aspetti economici relativi alla tecnologia fotovoltaica. Nel secondo capitolo vengono richiamati il modello classico di una cella solare e le definizioni riguardo le sue caratteristiche principali (punto di massima potenza, efficienza, fill factor, ecc.). Nello stesso capitolo un’overview sui materiali e sulle tecnologie utilizzate nella realizzazione dei dispositivi fotovoltaici divide, come suggerito da Martin Green, le celle solari in tre diverse generazioni: la prima comprende i dispositivi realizzati in silicio cristallino (mono e policrisallino), la seconda quelli in film sottile (in silicio amorfo, tellururo di cadmio CdTe, diseleniuro di rame e indio CIS, diseleniuro di rame, indio e gallio CIGS, diseleniuro di rame, indio, gallio e zolfo CIGSS) e le celle di Graetzel, e la terza le celle multigiunzione, a banda intermedia e quelle organiche. Nel capitolo tre viene fornita una descrizione dei componenti costituenti un sistema fotovoltaico connesso in rete e viene proposto un nuovo metodo per la determinazione delle caratteristiche corrente tensione e potenza tensione prodotte da dispositivi fotovoltaici. Il metodo risulta efficace in quanto non necessita di misure sperimentali da effetture sui diversi dispositivi. I dati forniti nei comuni data sheet che vengono forniti a corredo dei moduli fotovoltaici sono sufficienti a determinarne il comportamento al variare della temperatura di funzionamento e del livello di radiazione solare. L’efficienza di un sistema fotovoltaico (Balance Of the System, BOS) viene calcolata nel capitolo quattro. Particolare enfasi viene data all’effetto di mismatching che è tanto più importante quanto più è elevato il livello di ombreggiamento presente sul piano dei moduli fotovoltaici costituenti l’impianto. Infine, l’ultimo capitolo riguarda la descrizione del simulatore e delle sue applicazioni.
The subject of this work is a power electronic device, hereafter named photovoltaic field simulator, which converts the grid voltage into a current voltage characteristic. This characteristic replicates the behavior of a real photovoltaic field working in arbitrary conditions of irradiance and temperature. After building, the photovoltaic field simulator will be used in the photovoltaic laboratory which is connected to the experimental photovoltaic plant which will be installed on the roof top of the Materials and Natural Resources Department of Trieste University. The photovoltaic field simulator will be used for photovoltaic module parameters design with particular reference to its behavior when inserted in a photovoltaic field operating under shaded conditions. The use of the simulator will be particularly effective when simulating thin-film technologies as, for example, amorphous silicon, cadmium telluride, and etc. The photovoltaic field simulator will also be used for testing the components of grid connected photovoltaic systems with particular reference to the power conditioning units (also named inverters). These systems, which convert the direct current produced by the photovoltaic modules into a utility grade current (typically alternate and sinusoidal at a frequency of 50-60Hz), must extract maximum power from the photovoltaic field. The work is divided into five chapters. In the first a brief description of photovoltaic technology and its economic aspects is given. Chapter two is on classic solar cell modelling basics and on the definition of the parameters of photovoltaic technology (maximum power point, efficiency, fill factor, and etc.). In the same chapter a materials and technologies overview splits, as suggested by Martin Green, solar cells in three different generations: the first comprises crystalline silicon (mono and polycrystalline) devices, the second thin-film devices (amorphous silicon, cadmium telluride CdTe, copper indium diselenide CIS, copper indium gallium diselenide CIGS, copper indium gallium sulphur diselenide CIGSS), and the Graetzel cells, while the third multi-junction, intermediate band and organic photovoltaic devices. The third chapter briefly describes photovoltaic grid connected system components. In particular a new model for plotting photovoltaic current voltage and power voltage characteristics is provided. The method is original because only module data sheet parameters are used and experimental measurements are not needed in order to determine the photovoltaic modules behavior with reference to irradiance and working temperatures changes. In chapter four the Balance of a photovoltaic System (BOS) is calculated. In particular the importance of the mismatching effect of photovoltaic modules due to shaded conditions is shown. The last chapter is on simulator description and its applications.
XX Ciclo
1975

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Hölling, Matthias. « Adaptive current and voltage measurement device for low voltage distribution in power nets / ». [S.l.] : [s.n.], 2000. http://e-collection.ethbib.ethz.ch/show?type=diss&nr=13985.

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Ren, Huilin. « Current Voltage Characteristics of a Semiconductor Metal Oxide Sensor ». Fogler Library, University of Maine, 2001. http://www.library.umaine.edu/theses/pdf/RenH2001.pdf.

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McClusky, Scott Logan. « HIGH VOLTAGE RESONANT SELF-TRACKING CURRENT-FED CONVERTER ». DigitalCommons@CalPoly, 2010. https://digitalcommons.calpoly.edu/theses/254.

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High voltage power supply design presents unique requirements, combining safety, controllability, high performance, and high efficiencies. A new Resonant Self-Tracking Current-Fed Converter (RST-CFC) is investigated as a proof-of-concept of a high voltage power supply particularly for an X-ray system. These systems require fast voltage rise times and low ripple to yield a clear image. The proposed converter implements high-frequency resonance among discrete components and transformer parasitics to achieve high voltage gain, and the self-tracking nature ensures operation at maximum gain while power switches achieve zero-voltage switching across the full load range. This converter exhibits an inherent indefinite short-circuit capability. Theoretical results were obtained through simulations and verified by experimental results through a complete test configuration. Converter topology viability was confirmed through hardware testing and characterization.

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Špinar, Marek. « Ověření provozní výkonnosti a optimalizace FVE ». Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2016. http://www.nusl.cz/ntk/nusl-241950.

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The Master´s thesis deals with issues of operational performance of two photovoltaic power plants. In the thesis is stated the history of photovoltaics, description of photovoltaic effect, used materials and production technology of the most used material in PV industry – Silicon. The basic parts and parameters of photovoltaic power plant are described. Thesis also solves, how could be done the first and periodically control due to relevant directives. The ways of diagnostics potentional failures, methods of measuring and the exam of monitoring system are stated. Practice part is focused on measuring and comparing operational performance of FVE Kurdějov and FVE Šakvice II. Operational performance was calculated from exported data for years 2014 and 2015. The thesis also contains measuring of each string connected to inventors, which are installed on the power plant. The result is an identification of strings with decreased operational performance. Based on that was created recommendations for optimalization and increase of the performance. The last part is software for simulation of photovoltaic power plant. This SW calculates potentional energy, which could be produced in a day with available data export. The calculation is defined by parameters, which are assigned.

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Chen, Wei. « Low Voltage High Current Power Conversion with Integrated Magnetics ». Diss., Virginia Tech, 1998. http://hdl.handle.net/10919/30518.

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Very low voltage, high current output requirement have necessitated improvements in power supply's density and efficiency. Existing power conversion techniques cannot meet very stringent size and efficiency requirements. By applying the proposed magnetic integration procedure, new integrated magnetic circuits featuring low loss, simple structure, and ripple cancellation technique are then developed to overcome the limitations of prior art. Both cores and windings are integrated. Consequently, the power loss and the size of the integrated magnetic device are greatly reduced. Detailed analysis and design considerations of the proposed circuits are presented. As a result of applying the proposed technique, very high density, high efficiency, low voltage, high current power modules were developed. A typical example features an isolated 3.3V/30A power module with a power density of 130W/in3 and an efficiency of 90% at 500 KHz switching frequency.
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Günther, Sinapius, Hoornaert Winfried et Knovel (Firm), dir. Measuring current, voltage, and power. Amsterdam : Elsevier, 1999.

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High voltage direct current transmission. 2^e éd. London : The Institution of Electrical Engineers, 1998.

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C, Guerrini Nicola, dir. Low-voltage low-power CMOS current conveyors. Boston : Kluwer Academic Publishers, 2003.

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United States. Bureau of Reclamation. Denver Office. Electric Power Branch., dir. Flatiron Powerplant automatic voltage regulator performance. Denver, Colo : U.S. Dept. of the Interior, Bureau of Reclamation, Denver Office, Research and Laboratory Services Division, Electric Power Branch, 1989.

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Smith, Ryan M. Outdoor PV module degradation of current-voltage parameters : Preprint. Golden, CO : National Renewable Energy Laboratory, 2012.

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IEEE Power Engineering Society. Substations Committee., IEEE Power Engineering Society. Transmission and Distribution Committee., IEEE Standards Board et American National Standards Institute, dir. IEEE guide for specifications of high-voltage direct-current systems. New York, NY, USA : Institute of Electrical and Electronics Engineers, 1988.

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Tanzawa, Toru. On-chip High-Voltage Generator Design. New York, NY : Springer New York, 2013.

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Yazdani, Amirnaser. Voltage-sourced converters in power systems : Modeling, control, and applications. Hoboken, N.J : IEEE Press/John Wiley, 2010.

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Yazdani, Amirnaser. Voltage-sourced converters in power systems : Modeling, control, and applications. Hoboken, N.J : IEEE Press/John Wiley, 2010.

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1955-, Iravani Reza, dir. Voltage-sourced converters in power systems : Modeling, control, and applications. Hoboken, N.J : Wiley, 2010.

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Chapitres de livres sur le sujet "Current voltage and power voltage characteristics"

Penin, A. « Quasi-resonant Voltage Converter with Self-limitation of Load Current. Similarity of Load Characteristics of Some Electronic Devices ». Dans Power Systems, 489–513. Cham : Springer International Publishing, 2019. http://dx.doi.org/10.1007/978-3-030-35366-7_14.

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Penin, A. « Quasi-resonant Voltage Converter with Self-limitation of Load Current. Similarity of Load Characteristics of Some Electronic Devices ». Dans Power Systems, 389–411. Cham : Springer International Publishing, 2016. http://dx.doi.org/10.1007/978-3-319-28451-4_14.

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Honjo, Shoichi, Yoshibumi Sato et Yoshihisa Takahashi. « Numerical Analysis of AC Losses and Critical Current in High-Tc Superconductors with Power Law Current-Voltage Characteristics ». Dans Advances in Superconductivity XII, 839–41. Tokyo : Springer Japan, 2000. http://dx.doi.org/10.1007/978-4-431-66877-0_248.

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Persephonis, P., A. Ioannou, J. Parthenios, C. Georgiades et V. Giannetas. « The time evolution of the electric characteristics of a laser discharge through their waveforms of the voltage and the current ». Dans High Power Lasers — Science and Engineering, 139–52. Dordrecht : Springer Netherlands, 1996. http://dx.doi.org/10.1007/978-94-015-8725-9_8.

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Massarotti, Davide, et Francesco Tafuri. « Current–Voltage Characteristics ». Dans Fundamentals and Frontiers of the Josephson Effect, 235–74. Cham : Springer International Publishing, 2019. http://dx.doi.org/10.1007/978-3-030-20726-7_7.

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Rüberg, Sven, Angelo L’Abbate, Gianluca Fulli et Arturs Purvins. « High-Voltage Direct-Current Transmission ». Dans Power Systems, 157–213. London : Springer London, 2012. http://dx.doi.org/10.1007/978-1-4471-4549-3_5.

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Ibrahim, Nagwa F., et Sobhy S. Dessouky. « High-Voltage Direct Current Transmission ». Dans Power Systems, 5–14. Cham : Springer International Publishing, 2020. http://dx.doi.org/10.1007/978-3-030-51661-1_2.

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Ismail, Yehea I., et Eby G. Friedman. « Mosfet Current T-Voltage Characteristics ». Dans On-Chip Inductance in High Speed Integrated Circuits, 73–79. Boston, MA : Springer US, 2001. http://dx.doi.org/10.1007/978-1-4615-1685-9_4.

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Kories, Ralf, et Heinz Schmidt-Walter. « Current, Voltage and Power Measurement ». Dans Electrical Engineering, 169–91. Berlin, Heidelberg : Springer Berlin Heidelberg, 2003. http://dx.doi.org/10.1007/978-3-642-55629-6_4.

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Gurija, G. T., Yu K. Krasnov et S. K. Chamorovsky. « Current-Voltage Characteristics of the Bacteriorhodopsin ». Dans Topics in Molecular Organization and Engineering, 51–61. Dordrecht : Springer Netherlands, 1991. http://dx.doi.org/10.1007/978-94-011-3392-0_6.

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Actes de conférences sur le sujet "Current voltage and power voltage characteristics"

Prasad, Miska, J. Munichandra Sekhar et A. K. Akella. « Performance Comparison of Voltage Swell Characteristics in Power Distribution System ». Dans 2018 International Conference on Current Trends towards Converging Technologies (ICCTCT). IEEE, 2018. http://dx.doi.org/10.1109/icctct.2018.8550838.

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Djebarni, L., Y. Mebdoua et H. Lahmar. « Calculation of DC arc plasma torch current-voltage characteristics ». Dans 2013 IEEE Pulsed Power and Plasma Science Conference (PPPS 2013). IEEE, 2013. http://dx.doi.org/10.1109/ppc.2013.6627439.

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Fadhel, Siwar, Mohamed Trabelsi, Imen Bahri, Demba Diallo et Mohamed Faouzi Mimouni. « Faults effects analysis in a photovoltaic array based on current-voltage and power-voltage characteristics ». Dans 2016 17th International Conference on Sciences and Techniques of Automatic Control and Computer Engineering (STA). IEEE, 2016. http://dx.doi.org/10.1109/sta.2016.7952049.

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Zaputra, Satia. « Leakage current and partial discharge characteristics of epoxy resin material of distribution current transformer in salt fog pollutant condition ». Dans 2017 International Conference on High-Voltage Engineering and Power Systems (ICHVEPS). IEEE, 2017. http://dx.doi.org/10.1109/ichveps.2017.8225900.

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« Modeling of components with nonlinear voltage current characteristics for harmonic studies ». Dans 2004 IEEE Power Engineering Society General Meeting. IEEE, 2004. http://dx.doi.org/10.1109/pes.2004.1372920.

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Liu, Yang, et Nirmal-Kumar C. Nair. « Determination of stressed system loadability based on current and voltage characteristics ». Dans 2016 Australasian Universities Power Engineering Conference (AUPEC). IEEE, 2016. http://dx.doi.org/10.1109/aupec.2016.7749364.

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El-deen, S. Kamal, M. Abdel-Salam et M. Th El-Mohandes. « Current-Voltage Characteristics of DC Corona in Hybrid Transmission Lines as Influenced by the Applied AC Voltage ». Dans 2021 22nd International Middle East Power Systems Conference (MEPCON). IEEE, 2021. http://dx.doi.org/10.1109/mepcon50283.2021.9686221.

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Suwarno. « Understanding of Outdoor Insulator Characteristics through Leakage Current and Electrical Equivalent Circuit ». Dans 2021 3rd International Conference on High Voltage Engineering and Power Systems (ICHVEPS). IEEE, 2021. http://dx.doi.org/10.1109/ichveps53178.2021.9600915.

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Chenguo Yao, Zhongyong Zhao, Yu Chen, Xiaohan Chen, Chengxiang Li, Wei Li et Jian Wang. « Detection of internal winding faults in power transformers based on graphical characteristics of voltage and current ». Dans 2014 International Conference on High Voltage Engineering and Application (ICHVE). IEEE, 2014. http://dx.doi.org/10.1109/ichve.2014.7035475.

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Wei Sun, Yong Li, Dasheng Zeng, Runqiang Cai, Guoqing Yang et Zhenglin Meng. « Investigation of voltage-current characteristics of ZnO varistors under 8/20µs impulse current ». Dans 2011 IEEE Power Engineering and Automation Conference (PEAM). IEEE, 2011. http://dx.doi.org/10.1109/peam.2011.6135089.

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Rapports d'organisations sur le sujet "Current voltage and power voltage characteristics"

Nguyen, Ruby, Mike Severson, Bo Zhang, Bjorn Vaagensmith, Md Rahman, Ange-Lionel Toba, Paige Price, Ryan Davis et Sophie Williams. Electric Grid Supply Chain Review : Large Power Transformers and High Voltage Direct Current Systems. Office of Scientific and Technical Information (OSTI), février 2022. http://dx.doi.org/10.2172/1871501.

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Kuznetsov, Victor, Vladislav Litvinenko, Egor Bykov et Vadim Lukin. A program for determining the area of the object entering the IR sensor grid, as well as determining the dynamic characteristics. Science and Innovation Center Publishing House, avril 2021. http://dx.doi.org/10.12731/bykov.0415.15042021.

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Currently, to evaluate the dynamic characteristics of objects, quite a large number of devices are used in the form of chronographs, which consist of various optical, thermal and laser sensors. Among the problems of these devices, the following can be distinguished: the lack of recording of the received data; the inaccessibility of taking into account the trajectory of the object flying in the sensor area, as well as taking into consideration the trajectory of the object during the approach to the device frame. The signal received from the infrared sensors is recorded in a separate document in txt format, in the form of a table. When you turn to the document, data is read from the current position of the input data stream in the specified list by an argument in accordance with the given condition. As a result of reading the data, it forms an array that includes N number of columns. The array is constructed in a such way that the first column includes time values, and columns 2...N- the value of voltage . The algorithm uses cycles that perform the function of deleting array rows where there is a fact of exceeding the threshold value in more than two columns, as well as rows where the threshold level was not exceeded. The modified array is converted into two new arrays, each of which includes data from different sensor frames. An array with the coordinates of the centers of the sensor operation zones was created to apply the Pythagorean theorem in three-dimensional space, which is necessary for calculating the exact distance between the zones. The time is determined by the difference in the response of the first and second sensor frames. Knowing the path and time, we are able to calculate the exact speed of the object. For visualization, the oscillograms of each sensor channel were displayed, and a chronograph model was created. The chronograph model highlights in purple the area where the threshold has been exceeded.

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Luc, Brunet. Systematic Equations Handbook : Book 1-Energy. R&D Médiation, mai 2015. http://dx.doi.org/10.17601/rd_mediation2015:1.

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The energy equation handbook is the complete collection of physically coherent expression of energy computed using from 2 to 7 physical units among: density(ML-3) energy (ML2T-2) time (T) force (MLT-2) power (ML2T-3) current (I) temperature (Th) quantity (N) mass (M) length (L) candela (J) surface (L2) volume (L3) concentration (ML-3) frequency (T-1) acceleration (LT- 2) speed (LT-1) pressure (ML-1T-2) viscosity (ML-1T-1) luminance (L- 2J) MolarMass (MN-1) MassicEnergy (L2T-2) resistance (ML2T-3I-2) voltage (ML2T-3I-1) Farad (M-1L-2T4I2) Thermal- Conductivity (MLT-3Th-1) SpecificHeat (L2T-2Th-1) MassFlux (MT-1) SurfaceTension (MT-2) Charge (TI) Resistivity (ML3T-3I-2) The complete list of 4196 equations is sorted by number of variable required to obtain an energy in Joules. All the units are in MKSA.

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Effect of Spark Discharge Duration and Timing on the Combustion Initiation in a Lean Burn SI Engine. SAE International, avril 2021. http://dx.doi.org/10.4271/2021-01-0478.

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Meeting the increasingly stringent emission and fuel efficiency standards is the primary objective of the automotive research. Lean/diluted combustion is a promising avenue to realize high-efficiency combustion and reduce emissions in SI engines. Under the diluted conditions, the flame propagation speed is reduced because of the reduced charge reactivity. Enhancing the in-cylinder charge motion and turbulence, and thereby increasing the flame speed, is a possible way to harness the combustion process in SI engines. However, the charge motion can have a significant effect on the spark ignition process because of the reduced discharge duration and frequent restrikes. A longer discharge duration can aid in the formation of the self-sustained flame kernel and subsequent stable ignition. Therefore, an empirical study is undertaken to investigate the effect of the discharge duration and ignition timing on the ignition and early combustion in a port fueled SI engine, operated under lean conditions. The discharge duration is modulated from 1 ms to 8 ms through a continuous discharge strategy. The discharge current and voltage measurements are recorded during the engine operation to characterize the discharge process. The in-cylinder charge is diluted using fresh air to achieve lean combustion. The in-cylinder pressure measurement and heat release analysis are used to investigate the ignition and combustion characteristics of the engine. Preliminary results indicate that while the discharge duration has a marginal effect on the ignition delay, cyclic variations are notably impacted.

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