scholarly journals On the dynamics of cutting arc plasmas: the role of the power supply ripple

2012 ◽  
Vol 1 (2) ◽  
pp. 12 ◽  
Author(s):  
L. Prevosto
Keyword(s):  
Power Supply ◽  
Power Source ◽  
Power Sources ◽  
Equilibrium Plasma ◽  
Large Fluctuations ◽  
Arc Current ◽  
Arc Plasmas ◽  
Non Equilibrium

The power sources used in cutting arc torches are usually poorly stabilized and have a large ripple factor. The strong oscillatory components in the voltage and arc current produce in turn, large fluctuations in the plasma quantities. Experimental observations on the dynamics of the non-equilibrium plasma inside the nozzle of a 30 A oxygen cutting torch with a 7 % ripple level of its power source are reported in this work.

Role of perovskite-type metal oxides on atmospheric pressure non-equilibrium plasma generation

2001 ◽  
Vol 386 (2) ◽  
pp. 147-151 ◽  
Author(s):  
Kazutoshi Kiyokawa ◽  
Kazuo Sugiyama ◽  
Manabu Tomimatsu ◽  
Hideki Kurokawa ◽  
Hiroshi Miura
Keyword(s):  
Metal Oxides ◽  
Atmospheric Pressure ◽  
Equilibrium Plasma ◽  
Plasma Generation ◽  
Perovskite Type ◽  
Non Equilibrium

The essential role of redox potential/equilibrium constant in the ability of non-equilibrium plasma for nano-synthesis in liquids

2020 ◽  
Vol 128 (4) ◽  
pp. 043305
Author(s):  
Van-Phuoc Thai ◽  
Hideto Furuno ◽  
Nobuo Saito ◽  
Kazumasa Takahashi ◽  
Toru Sasaki ◽  
...  
Keyword(s):  
Redox Potential ◽  
Equilibrium Constant ◽  
Essential Role ◽  
Equilibrium Plasma ◽  
Potential Equilibrium ◽  
Non Equilibrium

scholarly journals Integrated use of Smart Grid technologies in railway traction networks

2020 ◽  
Vol 24 (5) ◽  
pp. 1041-1052
Author(s):  
Andrey Kryukov ◽  
◽  
Aleksandr Cherepanov ◽  
Irina Lyubchenko ◽  
◽  
...  
Keyword(s):  
Smart Grid ◽  
Distributed Generation ◽  
Power Supply ◽  
Reactive Power ◽  
Harmonic Coefficient ◽  
Power Source ◽  
High Quality ◽  
Power Sources ◽  
Supply Systems ◽  
Phase Number

The purpose of the paper is to develop a methodology for modeling railway power supply systems equipped with a set of devices implemented on the base of smart grid technologies. The research is carried out using the Fazonord software package designed for modeling the modes of railway power supply systems in phase coordinates. The calculation model is implemented for the power supply system of a two-track section with five traction substations. The results obtained show that reliable and high-quality power supply of train traction and non-traction consumers can be ensured on the basis of the integrated use of active Smart Grid elements, such as a phase number converter, active harmonic conditioner, controlled reactive power source, and a distributed generation unit. Computer simulation allows to establish that in the absence of reactive power sources there are noticeable voltage fluctuations on 10 kV buses of non-traction consumers; the asymmetry is approaching the limit of normally acceptable values; disabling of the active filter results in the increase of the total harmonic coefficient of voltages up to 16%; if the entire complex of active devices is available, the high quality of electrical energy is achieved; the phase number converter is robust and features low sensitivity to the errors in parameter setting; voltage deviations caused by the limited variation range of reactive power in the reactive power source are short-term and do not exceed the values acceptable in practice. Thus, on the basis of Smart Grid technologies, distributed generation units can be connected directly to the traction network using a phase number conversion device formed according to the reciprocal Steinmetz circuit. Elimination of harmonic distortions created by rectifier electric locomotives is carried out by means of an active conditioner of higher harmonics. A controlled reactive power source can be used to maintain voltage levels.

The role of electron scattering with vibrationally excited nitrogen molecules on non-equilibrium plasma kinetics

2013 ◽  
Vol 20 (10) ◽  
pp. 101609 ◽  
Author(s):  
Mario Capitelli ◽  
Gianpiero Colonna ◽  
Giuliano D'Ammando ◽  
Vincenzo Laporta ◽  
Annarita Laricchiuta
Keyword(s):  
Electron Scattering ◽  
Vibrationally Excited ◽  
Plasma Kinetics ◽  
Equilibrium Plasma ◽  
Excited Nitrogen ◽  
Non Equilibrium

scholarly journals POWER UNITS AND POWER SUPPLY SYSTEMS IN UAV

Aviation ◽  
2014 ◽  
Vol 18 (1) ◽  
pp. 1-8 ◽  
Author(s):  
Leszek Cwojdziński ◽  
Mirosław Adamski
Keyword(s):  
Unmanned Aerial Vehicles ◽  
Power Supply ◽  
Power Source ◽  
Propulsion System ◽  
Propulsion Systems ◽  
Power Sources ◽  
Aerial Vehicles ◽  
Supply Systems

One of the major tasks in the process of designing future unmanned aerial vehicles is the appropriate choice of a propulsion system and a power source. Depending on the role and size of a given UAV, the following engines are used: electric, jet, turbine and piston (combustion). The following paper also analyses the faultiness of UAVs. Moreover, the most appropriate propulsion systems and power sources depending on the type and description of the mission performed by a UAV are recommended.

Fluorination of Polymeric Films by a Non Equilibrium Plasma at an Atmospheric Pressure

1986 ◽  
Vol 72 ◽  
Author(s):  
F. Rouzbehi ◽  
J. Amouroux ◽  
M. Goldman
Keyword(s):  
Atmospheric Pressure ◽  
Plasma Reactor ◽  
Polymeric Film ◽  
Polymeric Films ◽  
Polymeric Substrate ◽  
Equilibrium Plasma ◽  
Residual Oxygen ◽  
Polymeric Substrates ◽  
Non Equilibrium

AbstractThe polymerization of I-I difluoroethylene has been realized by a non equilibrium plasma at an atmospheric pressure on polymeric substrates such as polypropylene (PP). The graft copolymerizat ion onto the PP film was carried out when activating the polymeric substrate in the presence of argon. The structure of the polymeric film obtained depends on the residual oxygen in the plasma reactor. The role of the radicals which interfere in the grafting mechanisms of monomers onto polypropylene films has been studied.

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