Готові списки джерел за темами / Crowbar Application

Добірка наукової літератури з теми "Crowbar Application"

Автор: Grafiati

Опубліковано: 6 вересня 2023

Оновлено: 7 вересня 2023

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Статті в журналах з теми "Crowbar Application"

T.G. Joshi, Subhash, and Vinod John. "Thyristor voltage equalising network for crowbar application." IET Power Electronics 11, no. 11 (July 26, 2018): 1839–48. http://dx.doi.org/10.1049/iet-pel.2017.0932.

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Grainys, Audrius, Jurij Novickij, Tomaš Stankevič, Voitech Stankevič, Vitalij Novickij, and Nerija Žurauskienė. "Single Pulse Calibration of Magnetic Field Sensors Using Mobile 43 kJ Facility." Measurement Science Review 15, no. 5 (October 1, 2015): 244–47. http://dx.doi.org/10.1515/msr-2015-0033.

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Abstract In this work we present a mobile 43 kJ pulsed magnetic field facility for single pulse calibration of magnetic field sensors. The magnetic field generator is capable of generating magnetic fields up to 40 T with pulse durations in the range of 0.3-2 ms. The high power crowbar circuit is used for the reverse voltage protection and pulse shaping purposes. The structure, the development challenges and the implemented solutions to improve the facility for the calibration of the magnetic field sensors are overviewed. The experimental data of the application of the proposed generator for the calibration of manganite magnetic field sensors are presented.

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Seetawan, Tosawat. "Possibility of Thermoelectric Oxide for Thermal Sensors." Key Engineering Materials 675-676 (January 2016): 601–6. http://dx.doi.org/10.4028/www.scientific.net/kem.675-676.601.

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The thermoelectric effects in oxide materials are developed to the Seebeck effect for thermal sensing. Thermal sensors are the thermal converters, in which an electrical, magnetic, mechanical, radiation, chemical signal are measured by converting it into heat and measuring the resulting temperature changes in the device. This proposes an analysis the electrical converters and radiation sensors by using single−junction of p−Ca3Co4O9 and n−CaMnO3 materials are presented into possible thermal sensing. Several thermal converters are measured the signal electrical resistivity, and Seebeck coefficient depended on temperature. Thermal radiation sensors are included the sensitivity, electricity, and specific detectivity. For application, thermoelectric oxide cell can be fabricated crowbar circuit for protection an overvoltage condition of a power supply which it yield 1.2 s turn off switch.

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Li, Xu, Yuping Lu, and Tao Huang. "Impact of the DFIG-Based Wind Farm Connection on the Fault Component-Based Directional Relay and a Mitigation Countermeasure." Energies 13, no. 17 (August 26, 2020): 4414. http://dx.doi.org/10.3390/en13174414.

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With high sensitivity and strong tolerance capability for the fault resistance, the fault component-based directional relay (FCBDR) has drawn considerable attention from industry and academia. However, the best application environment for FCBDR no longer exists when considering the large-scale connection of the doubly fed induction generator (DFIG)-based wind farms. Through a detailed analysis of the superimposed impedance of DFIG, this paper reveals that the performances of FCBDRs may be shown negatively impacted by the fault behaviors of DFIG when the crowbar protection inputs. In addition, this paper proposes a mitigation countermeasure to deal with those issues. The proposed countermeasure takes advantage of the different superimposed impedance features of DFIG compared with that of the synchronous generator (SG) to enhance the adaptability of the conventional FCBDRs. Extensive simulation results show that the proposed countermeasure can differentiate the fault direction clearly under different fault conditions.

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Stankevic, Voitech, Povilas Simonis, Nerija Zurauskiene, Arunas Stirke, Aldas Dervinis, Vytautas Bleizgys, Skirmantas Kersulis, and Saulius Balevicius. "Compact Square-Wave Pulse Electroporator with Controlled Electroporation Efficiency and Cell Viability." Symmetry 12, no. 3 (March 5, 2020): 412. http://dx.doi.org/10.3390/sym12030412.

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The design and development of a compact square-wave pulse generator for the electroporation of biological cells is presented. This electroporator can generate square-wave pulses with durations from 3 μs up to 10 ms, voltage amplitudes up to 3500 V, and currents up to 250 A. The quantity of the accumulated energy is optimized by means of a variable capacitor bank. The pulse forming unit design uses a crowbar circuit, which gives better control of the pulse form and its duration, independent of the load impedance. In such cases, the square-wave pulse form ensures better control of electroporation efficiency by choosing parameters determined in advance. The device has an integrated graphic LCD screen and measurement modules for the visualization of the current pulse, allowing for express control of the electroporation quality and does not require an external oscilloscope for current pulse recording. This electroporator was tested on suspensions of Saccharomyces cerevisiae yeast cells, during which, it was demonstrated that the application of such square-wave pulses ensured better control of the electroporation efficiency and cell viability after treatment using the pulsed electric field (PEF).

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Nickles, Thomas. "The crowbar model of method and its implications." THEORIA. An International Journal for Theory, History and Foundations of Science 34, no. 3 (December 5, 2019): 357. http://dx.doi.org/10.1387/theoria.19070.

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There is a rough, long-term tradeoff between rate of innovation and degree of strong realism in scientific practice, a point reflected in historically changing conceptions of method as they retreat from epistemological foundationism to a highly fallibilistic, modeling perspective. The successively more liberal, innovation-stimulating methods open up to investigation deep theoretical domains at the cost, in many cases, of moving away from strong realism as a likely outcome of research. The crowbar model of method highlights this tension, expressed as the crowbar compromiseand the crowbar fallacy. The tools-to-theories heuristic, described and evaluated by Gigerenzer and colleagues, can be regarded as an attempt by some scientific realists to overcome this compromise. Instead, it is an instance of it. Nonetheless, in successful applications the crowbar model implies a modest, instrumental (nonrepresentational) realism.

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Nian, Heng, and Xiao Jin. "Modeling and Analysis of Transient Reactive Power Characteristics of DFIG Considering Crowbar Circuit under Ultra HVDC Commutation Failure." Energies 14, no. 10 (May 11, 2021): 2743. http://dx.doi.org/10.3390/en14102743.

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Ultra high voltage direct current (UHVDC) transmission is an effective means of long-distance transmission of renewable power generation, which has obtained a lot of research and practical applications. The commutation failure is a common DC transmission fault, which will cause the voltage amplitude of the sending ac grid in UHVDC system to first decrease then increase. The existing transient mathematical models of the wind power generation system (WPGS) are difficult to apply to scenarios where the grid voltage changes continuously. A mathematical model suitable for commutation failure is established to analyze the transient reactive power characteristics of the doubly fed induction generator (DFIG)-based WPGS with the consideration of the crowbar circuit trigger. The correctness of the mathematical model is validated by an experiment based on the control hardware-in-loop (CHIL) platform. Based on the proposed mathematical model, the influence of the crowbar parameters on the reactive power output of the DFIG is analyzed, and the selection of crowbar parameters to suppress the overvoltage of the sending ac grid is investigated. A simulation model is built based on Matlab/Simulink to verify the overvoltage suppression effect of the proposed selection scheme.

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Saxena, Alok Kumar, Anand M. Rawool, and Trilok C. Kaushik. "Crowbar Scheme Based on Plasma Motion for Pulsed Power Applications." IEEE Transactions on Plasma Science 41, no. 10 (October 2013): 3058–62. http://dx.doi.org/10.1109/tps.2013.2279850.

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Fery, Richard L., and Philip D. Dukes. "Southern Blight (Sclerotium rolfsiiSacc.) of Cowpea: Genetic Characterization of Two Sources of Resistance." International Journal of Agronomy 2011 (2011): 1–6. http://dx.doi.org/10.1155/2011/652404.

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Field studies were conducted to characterize the genetic nature of resistance to southern blight (caused bySclerotium rolfsiiSacc.) exhibited by the cowpea [Vigna unguiculata(L.) Walp.] cultivars Carolina Cream and Brown Crowder and to determine if a genetic relationship exists for this resistance between the two cultivars. Examination of the comparative frequency distributions of the parental and progeny populations of the “Carolina Cream” x “Magnolia Blackeye” and “Brown Crowder” x “Magnolia Blackeye” crosses and the corresponding segregation data indicates that the southern blight resistances exhibited by “Carolina Cream” and “Brown Crowder” are conditioned by single dominant genes. Examination of the segregation data from the parental and progeny populations of the “Carolina Cream” x “Brown Crowder” cross suggests that the two resistance genes are not allelic. The availability of each of the resistance genes in cultivar-type genetic backgrounds should allow for rapid incorporation of southern blight resistance genes into other cowpea cultivars by the application of conventional plant breeding methodologies.

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Akin, D. Scott, and David R. Shaw. "In-Season Applications of Glyphosate for Control of Redvine (Brunnichia ovata) in Glyphosate-Resistant Soybean." Weed Technology 18, no. 2 (June 2004): 325–31. http://dx.doi.org/10.1614/wt-03-074r1.

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An experiment was initiated at two sites in 1998 near Crowder, MS, to evaluate the effect of in-season applications of glyphosate on redvine populations in glyphosate-resistant soybean. In the year of application, most treatments containing multiple in-season applications of glyphosate reduced redvine populations. However, at 16 mo after treatment (October 1999), 0.63 kg ai/ha paraquat preplant followed by sequential postemergence applications of glyphosate at 1.1 and 2.2 kg ai/ ha reduced redvine stems by 45% compared with the untreated check. Redvine control with this treatment also was comparable with 2.2 kg ai/ha dicamba preharvest. The same results were observed at 12 and 14 mo after application with many treatments containing sequential applications of glyphosate, but glyphosate at 1.1 and 2.2 kg ai/ha was the only in-season treatment to maintain redvine suppression during the entire growing season the year after herbicide application. However, a number of treatments delayed redvine reinfestation; thus, soybean yield was improved over the untreated check with all treatments from the previous year containing in-season applications of glyphosate, except for 0.84 kg/ha followed by 0.56 kg/ha. Increasing rates of in-season glyphosate applications to 1.1 followed by 2.2 kg/ha will adequately suppress redvine populations in glyphosate-resistant soybean, controlling annual weeds in the process.

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Дисертації з теми "Crowbar Application"

Joshi, T. G. Subhash. "Power Electronic Technologies for Medium and High Power High Voltage Power Supplies." Thesis, 2017. http://etd.iisc.ac.in/handle/2005/4322.

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The performance of systems used in various high voltage applications depend majorly on the output voltage ripple of High Voltage Power Supplies (HVPS). One of the failure mode of microwave tube (MWT) commonly used in these applications is due to the energy accumulation above the specified limit during fault events due to higher stored energy in HVPS. This demands either a protection for MWT or reduced ripple voltage without increasing the stored energy. This thesis investigates a protection device for MWT that operate with MW power level HVPS, and design method to reduce the output voltage ripple for medium power HVPS. A crowbar is an energy diverting device connected in parallel with the MWT. It protects the tube during fault by providing an alternative path for the ow of energy. Conventional crowbars are built using either mercury or nitrogen gas-based switches. Due to the environmental concern and higher operational cost, the state-of-the-art is to replace these devices with semiconductor devices, referred to as solid state crowbar (SSC). This research, models and designs the subcomponents of an SSC, including: (i) Modelling of fault current, and a fuse wire that is used to emulate a MWT during internal arc (ii) Design of di=dt limiting inductor (iii) Design of static and dynamic voltage balancing network for the thyristor (iv) Mechanical assembly design that ensures meeting the required crowbar electrical characteristics (v) Selection of cost-effective semiconductor device for crowbar application (vi) Thermal modelling of crowbar for pulse power applications (vii) Selection of cable for the pulse power application. In a switched converter topology, the causes of output voltage ripple are: the switch action, input dc ripple, and variations in the load. In this thesis the influence of input voltage ripple on the output dc voltage, called Audio Susceptibility (AS), is discussed. AS of load resonant converters has not been widely studied in literature. This research uses exact discretization method to obtain: (i) The analytical large signal and cyclic steady state model of the Series Resonant Converter (SRC) considering the resonant tank and output filter states (ii) The analytical small signal AS model of the SRC, and resonant gain condition for input ripple (iii) The design of an SRC for superior AS performance (iv) A comparison of SRC design for (a) superior AS performance and (b) maximum power transfer capability (v) A selection of SRC components including the high voltage high frequency magnetics and selection of the MosFET. All the modelling and design method considered in this work has been verified by experimental studies on two 10MW, 10kV peak power SSC and a 10kW, 10kV SRC that has been fabricated as a part of the research.

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Тези доповідей конференцій з теми "Crowbar Application"

Bekiroglu, Erdal, and Muhammed Duran Yazar. "Improving Fault Ride Through Capability of DFIG with Fuzzy Logic Controlled Crowbar Protection." In 2022 11th International Conference on Renewable Energy Research and Application (ICRERA). IEEE, 2022. http://dx.doi.org/10.1109/icrera55966.2022.9922804.

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Cliffe, R. J. "Inexpensive single-shot crowbar for high-power applications." In IEE Symposium Pulsed Power 2001. IEE, 2001. http://dx.doi.org/10.1049/ic:20010147.

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Rodriquez, M., G. Abad, I. Sarasola, and A. Gilabert. "Crowbar control algorithms for doubly fed induction generator during voltage dips." In 2005 IEEE 11th European Conference on Power Electronics and Applications. IEEE, 2005. http://dx.doi.org/10.1109/epe.2005.219521.

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Gu, Y. J., Y. Nie, Y. J. Jiao, and Y. Q. Xu. "Transient Characteristics Analysis of DFIG during Power Grid Fault and Crowbar Resistance Adaptive Tuning." In International Conference on Computer Information Systems and Industrial Applications. Paris, France: Atlantis Press, 2015. http://dx.doi.org/10.2991/cisia-15.2015.54.

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de Oliveira Silva, Stefania, Washington Luiz Araujo Neves, and Wellington Santos Mota. "Crowbar Active Protection Scheme in the Wind Energy Conversion System using the Doubly Fed Induction Generator." In 2021 14th IEEE International Conference on Industry Applications (INDUSCON). IEEE, 2021. http://dx.doi.org/10.1109/induscon51756.2021.9529663.

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Salles, M. B. C., A. J. S. Filho, and A. P. Grilo. "A study on the rotor side control of DFIG-based wind turbine during voltage sags without crowbar system." In 2012 International Conference on Renewable Energy Research and Applications (ICRERA). IEEE, 2012. http://dx.doi.org/10.1109/icrera.2012.6477337.

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Lohde, Ralf, Simon Jensen, Andre Knop, and Friedrich W. Fuchs. "Analysis of three phase grid failure and Doubly Fed Induction Generator ride-through using crowbars." In 2007 European Conference on Power Electronics and Applications. IEEE, 2007. http://dx.doi.org/10.1109/epe.2007.4417685.

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Noubrik, A., L. Chrifi-Alaoui, P. Bussy, and A. Benchaib. "Analysis and simulation of a 1.5 MVA doubly fed wind-power in MATLAB SimPowerSystems using crowbar during power systems disturbances." In 2011 International Conference on Communications, Computing and Control Applications (CCCA). IEEE, 2011. http://dx.doi.org/10.1109/ccca.2011.6031504.

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Haidar, Ahmed M. A., Kashem M. Muttaqi, and Mehrdad T. Hagh. "A coordinated control approach for DC link and rotor crowbars to improve fault ride-through of DFIG based wind turbines." In 2015 IEEE Industry Applications Society Annual Meeting. IEEE, 2015. http://dx.doi.org/10.1109/ias.2015.7356822.

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Gamey, T. Jeffrey, M. Thompson, W. Mandell, G. Frano, and S. Miller. "Karst Pathway Delineation Using Combined Spatial and Geophysical Analysis at Camp Crowder, Missouri." In Symposium on the Application of Geophysics to Engineering and Environmental Problems 2002. Environment and Engineering Geophysical Society, 2002. http://dx.doi.org/10.4133/1.2927069.

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