scholarly journals Hybrid Models of Electric Arc with Improved Dynamic Characteristics in Wide Ranges of Changes in Bipolar Current Value

2017 ◽  
Vol 2017 (2) ◽  
pp. 38-43
Author(s):  
Antoni Sawicki
Keyword(s):  
Dynamic Characteristics ◽  
Hybrid Models ◽  
Electric Arc ◽  
Current Value

scholarly journals Creation of a Composite Material Based on Low-sized Carbon Particles

2020 ◽  
Vol 6 (1) ◽  
pp. 192-197
Author(s):  
N. Zhogashtiev
Keyword(s):  
Composite Material ◽  
Thermal Shock ◽  
Thermal Shock Resistance ◽  
Carbon Materials ◽  
Double Electric Layer ◽  
Electric Arc ◽  
Carbon Particles ◽  
Shock Resistance ◽  
Current Value ◽  
Carbon Molecules

The article considers the issues of thermal shock resistance of carbon materials. To obtain a composite material, the method of electric arc treatment with a relatively low current value was used. The resulting material and its properties correspond to the concept of a double electric layer at the interface, which is due to the orientation of carbon molecules.

scholarly journals The Effect of the Selection of a Function Approximating Static Characteristics on the Modelling of Electric Arc

2020 ◽  
pp. 43-50
Author(s):  
Antoni Sawicki
Keyword(s):  
Research Work ◽  
Hybrid Models ◽  
Electric Arc ◽  
Static Characteristics ◽  
Current Voltage ◽  
Current Voltage Characteristics ◽  
Effective Use ◽  
Selection Of ◽  
Dynamic States

The article presents selected tapering functions useful when creating hybrid models and functions approximating static current-voltage characteristics of arc. The research work involved the formation and verification of families of static current-voltage characteristics with defined values of voltage ignition and the extension of approximating possibilities of the formulas through the use of tapering functions. The effective use of various functions approximating static characteristics in the modelling of dynamic states in the circuit with electric arc was verified through simulation.

scholarly journals REGULATION OF OUTPUT DYNAMIC CHARACTERISTICS OF ELECTRIC DISCHARGE INSTALLATIONS WITH RESERVOIR CAPACITORS

2021 ◽  
Vol 2021 (3) ◽  
pp. 3-9
Author(s):  
A.A. Shcherba ◽  
◽  
N.I. Suprunovska ◽  
M.A. Shcherba ◽  
S.S. Roziskulov ◽  
...  
Keyword(s):  
Electric Discharge ◽  
Dynamic Characteristics ◽  
Discharge Current ◽  
Discharge Process ◽  
Storage Devices ◽  
Linear Resistance ◽  
Maximum Current ◽  
Semiconductor Switch ◽  
Discharge Duration ◽  
Current Value

The paper reveals the dependences of the output dynamic characteristics of semiconductor electric discharge installations (EDIs) with reservoir capacitors on the features of the change in the value of their capacitance. In particular, it is substantiated that for any fixed discharge duration less than the duration of reaching the maximum discharge current, an increase in the capacitance of such storage devices causes an increase in the value of the final discharge current both at aperiodic and oscillatory discharges in the linear resistance of the technological load. The change in the value of the discharge current in the load in the case of forced interruption of this current at a certain moment of time is investigated. Based on the obtained regularities, the authors of the work proposed to use the capacitance of the EDI's capacitor, which is larger than capacitance required to implement the maximum value of the discharge current in the load. Using a capacitor with a larger capacity and a fully controlled semiconductor switch in the discharge circuit of the EDI, it is possible to obtain the required maximum current value at a shorter duration of the discharge process. Thus, it is possible to regulate the main dynamic parameters of pulse currents in the load – the rate of their rise and/or their duration by changing the value of the capacitance of the discharge capacitor EDI. This approach is expedient for increasing the productivity of EDIs, focused on the production of dispersed spark powders of metals and alloys. References 15, figures 3.

Analytical Electron Microscopy Characterization of Electric Arc Furnace Dust

1981 ◽  
Vol 39 ◽  
pp. 134-135
Author(s):  
J. R. Porter ◽  
J. I. Goldstein ◽  
D. B. Williams
Keyword(s):  
Electron Microscopy ◽  
Analytical Electron Microscopy ◽  
Electric Arc Furnace ◽  
Electric Arc ◽  
Dust Particles ◽  
Particle Analysis ◽  
Arc Furnace ◽  
Analytical Electron ◽  
Residual Elements ◽  
Industry Practice

Alloy scrap metal is increasingly being used in electric arc furnace (EAF) steelmaking and the alloying elements are also found in the resulting dust. A comprehensive characterization program of EAF dust has been undertaken in collaboration with the steel industry and AISI. Samples have been collected from the furnaces of 28 steel companies representing the broad spectrum of industry practice. The program aims to develop an understanding of the mechanisms of formation so that procedures to recover residual elements or recycle the dust can be established. The multi-phase, multi-component dust particles are amenable to individual particle analysis using modern analytical electron microscopy (AEM) methods.Particles are ultrasonically dispersed and subsequently supported on carbon coated formvar films on berylium grids for microscopy. The specimens require careful treatment to prevent agglomeration during preparation which occurs as a result of the combined effects of the fine particle size and particle magnetism. A number of approaches to inhibit agglomeration are currently being evaluated including dispersal in easily sublimable organic solids and size fractioning by centrifugation.

Dynamic characteristics of linear induction motor for urban transit under constant V/f drive

1990 ◽  
Vol 110 (7) ◽  
pp. 102-109
Author(s):  
Sakutaro Nonak ◽  
Nobuo Fujii ◽  
Yasunobu Kojima
Keyword(s):  
Induction Motor ◽  
Dynamic Characteristics ◽  
Urban Transit ◽  
Linear Induction ◽  
Linear Induction Motor

The “ Electric Arc”

1911 ◽  
Vol 105 (6) ◽  
pp. 116-116
Keyword(s):  
Electric Arc
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