Generalization of the current-voltage characteristics of electric arc heaters

1967 ◽  
Vol 13 (3) ◽  
pp. 170-171 ◽  
Author(s):  
A. I. Zhidovich ◽  
S. K. Kravchenko ◽  
O. I. Yas'ko
Keyword(s):  
Electric Arc ◽  
Current Voltage ◽  
Current Voltage Characteristics

scholarly journals The Mayr-Pentegov Model of Electric Arc Involving the Use of the Exponential Function and Enabling the Approximation of Static Characteristics

2021 ◽  
pp. 51-59
Author(s):  
Antoni Sawicki
Keyword(s):  
Exponential Function ◽  
Electric Arc ◽  
Static Characteristics ◽  
Exponential Component ◽  
Integral Forms ◽  
Current Voltage ◽  
Current Voltage Characteristics

The article presents the justified use of functions containing the exponential component for the approximation of the static current-voltage characteristics of electric arc. The Author proposed a new function approximating the above-named characteristics which were next used in the mathematical Mayr-Pentegov model, expressed in two, i.e. differential and integral, forms. The two forms constituted the basis enabling the development of macromodels using controlled voltage and current sources. The article also presents families of dynamic current-voltage characteristics obtained through the simulation of processes in a circuit containing macromodels of arc powered by the source of current characterised by sinusoidal and trapezoidal waveforms and various frequency. The article demonstrates the usability of the proposed variants of the Mayr-Pentegov model.

scholarly journals Mathematical modeling of electrical parameters of AC–EAF

2019 ◽  
Vol 62 (7) ◽  
pp. 571-577
Author(s):  
B. S. Dmitrievskii ◽  
A. V. Bashkatova
Keyword(s):  
Differential Equation ◽  
Control Systems ◽  
Low Voltage ◽  
Control Object ◽  
Electric Arc ◽  
Arc Length ◽  
Current Voltage ◽  
Current Voltage Characteristics ◽  
Secondary Side ◽  
Object Behavior

The article presents one of the possible options of mathematical model formation of an electric arc steel-making furnace (EAF). A lot of reports on this subject were studied in order to make a model that most accurately reflects the control object behavior (for EAF). The basic building principles demonstrate the fact that the primary element is substitution pattern of electric circuit of the installation. Cassie nonlinear differential equation was used to get a mathematical model of an electric arc. This nonlinear differential equation is very popular among the researchers. Model update is provided by calculating the electrical circuit parameters on the secondary side of transformer low voltage and by studying statistics from home and foreign scientists’ contributions. Different values of the “time-constant” of arc conductivity were used to analyze the control object behavior at different instants of time. It made it possible to take into account the nonstationarity of the state of electrode sheaths that were influenced by external disturbances, temperature variations, pressure and gas composition in the course of production processes. Such an approach made possible to form an aggregate picture of the control object behavior under the conditions of a nonstationary state of the arc combustion area at different stages of melting; to evaluate possible regulation characteristics and to determine control system requirements. The structural scheme of the model of a three-phase AC–EAF was formed. All necessary calculations of circuit elements and modeling were performed using the MATLAB Simulink package. The block diagram includes AC voltage source, direct-current resistance, and inductance of the transformer on secondary side and a low-voltage circuit, a model of an AC electric arc. The model was used to analyze the dynamic characteristics of electric arc as being an electrical object to show the voltage–dependence of current – current-voltage characteristics. The configuration of current-voltage characteristics determines burning behavior of the arc, existence domain, stability and control quality. Current-voltage characteristics were studied under the conditions of different values of the voltage on the secondary side of transformer and arc length and for different values of the “time-constant arc conductivity”. The model was also used to analyze the static characteristics. The dependence of the arc length on the current for different voltage of the transformer steps is nonlinear. Recommendations on the choice of control actions and the construction of control systems for different stages of melting are given. For example at the initial stage of melting, the control system should perform minimization problems of number of breaks under the condition of an insignificant domain of the arc existence and limit the value of lead-in power. The simulation results show that the nonstationarity of the process leads to the need to use self-organizing control systems capable of adjusting to the continually varying state of the object.

Current-voltage characteristics and emf of an electric-arc heater operating with various gases

1967 ◽  
Vol 12 (6) ◽  
pp. 375-379 ◽  
Author(s):  
F. B. Yurevich ◽  
M. V. Volk-Levanovich ◽  
A. G. Shashkov
Keyword(s):  
Electric Arc ◽  
Current Voltage ◽  
Arc Heater ◽  
Current Voltage Characteristics

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 Selected Properties of High-Frequency Electric Arc Initiators and Stabilisation Oscillators. Part 1. Devices with Free Electric Arc

2021 ◽  
Author(s):  
Antoni Sawicki
Keyword(s):  
Physical Properties ◽  
High Voltage ◽  
High Frequency ◽  
Electric Arc ◽  
Spark Discharges ◽  
Spark Gap ◽  
Current Voltage ◽  
Current Voltage Characteristics ◽  
Dynamic States

The article presents selected physical properties of electric arc used in welding engineering as well as discusses differences in requirements concerning ionisers used to initiate and re-initiate electric arc. In addition, the article compares properties of ioniser systems used to stabilise electric arc burning as well as discusses spark gap and semiconductor systems generating high-frequency and high-voltage impulses used to generate spark discharges. The article also discusses the effect of ioniser operation after the modification of static current-voltage characteristics, enabling the modelling of dynamic states of electric arc.

scholarly journals Investigation of the characteristics of an electric arc plasmatron with variable geometry electrodes

2021 ◽  
Vol 2119 (1) ◽  
pp. 012045
Author(s):  
V.A. Faleev ◽  
R.A. Bikeev ◽  
P.V. Domarov
Keyword(s):  
Thermal Efficiency ◽  
Electric Arc ◽  
Variable Geometry ◽  
Energy Characteristics ◽  
Current Voltage ◽  
Current Voltage Characteristics

Abstract The study of the electric arc plasmatron was carried out. The energy characteristics of the plasmatron, thermal efficiency and current-voltage characteristics were experimentally investigated. The comparison of the energy characteristics with the plasmatron having no changing geometry of the electrodes was carried out.

PULSED CURRENT VOLTAGE CHARACTERISTICS OF A THERMALLY PRODUCED PLASMA

1979 ◽  
Vol 40 (C7) ◽  
pp. C7-491-C7-492
Author(s):  
N. St. J. Braithwaite ◽  
J. E. Allen
Keyword(s):  
Pulsed Current ◽  
Current Voltage ◽  
Current Voltage Characteristics

Current-voltage characteristics of Li-doped MgO oxidized at elevated temperatures

1980 ◽  
Vol 41 (C6) ◽  
pp. C6-398-C6-400 ◽  
Author(s):  
Y. Chen ◽  
J. L. Boldu ◽  
V. M. Orera
Keyword(s):  
Elevated Temperatures ◽  
Current Voltage ◽  
Current Voltage Characteristics
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