scholarly journals PLASMA-SURFACE INTERACTION OF ELECTRIC ARC DISCHARGE BETWEEN COMPOSITE Cu-Cr ELECTRODES

2020 ◽  
pp. 174-178
Author(s):  
A. Murmantsev ◽  
A. Veklich ◽  
V. Boretskij ◽  
M. Bartlová ◽  
L. Dostál ◽  
...  
Keyword(s):  
Arc Discharge ◽  
Optical Emission ◽  
Electric Arc ◽  
Surface Interaction ◽  
Composite Electrodes ◽  
Plasma Parameters ◽  
Plasma Surface ◽  
Air Atmosphere ◽  
Different Temperatures ◽  
Arc Discharges

In this work the plasma of electric arc discharges between Cu-Cr composite electrodes, which material were pressured and sintered at different temperatures 750 or 1050°С, are investigated by Optical Emission Spectroscopy (OES). The Scanning Electron Microscopy (SEM) with Energy-Dispersive X-ray Spectroscopy (EDXS) are used to study the working surface of electrodes, modified by thermal effect of breaking electrical arc in the air atmosphere. The erosion intensity of electrodes’ material due to plasma-surface interaction is estimated in indirect way by determination of metal vapours content in the discharge gap in an assumption of local thermodynamic equilibrium (LTE). The plasma composition is calculated in this case on the base of experimentally determined plasma parameters: temperature and electron density.

scholarly journals COMPOSITE Cu-Cr MATERIALS UNDER THERMAL ACTION OF ELECTRIC ARC DISCHARGE PLASMA

2021 ◽  
pp. 98-101
Author(s):  
A. Murmantsev ◽  
A. Veklich ◽  
V. Boretskij ◽  
M. Bartlová ◽  
L. Dostál ◽  
...  
Keyword(s):  
Discharge Plasma ◽  
Arc Discharge ◽  
Plasma Temperature ◽  
Thermal Action ◽  
Optical Emission ◽  
Electric Arc ◽  
Composite Electrodes ◽  
Plasma Parameters ◽  
Arc Discharges ◽  
The Impact

The results of optical emission spectroscopy (OES) investigation of plasma of electric arc discharges in steadystate mode between Cu-Cr composite electrodes, manufactured at different sintered temperatures: 750, 850, 950 or 1050 °C, is presented. In particular, the impact of sintering temperature on erosion resistanceof such composite materials, which was determined in indirect manner by estimation of metal vapours content in the midsection of discharge gaps, is studied by the analysis of plasma parameters. These contents were calculated in assumption of local thermodynamic equilibrium (LTE) on the base of experimentally obtained radial distributions of plasma temperature and electron density.

scholarly journals Thermal Plasma of Electric Arc Discharge Between Cu-Cr Composite Electrodes

2019 ◽  
Vol 6 (1) ◽  
pp. 27-30
Author(s):  
A. Veklich ◽  
V. Boretskij ◽  
M. Kleshych ◽  
S. Fesenko ◽  
A. Murmantsev ◽  
...  
Keyword(s):  
Arc Discharge ◽  
Optical Emission ◽  
Plasma Source ◽  
Electric Arc ◽  
Arc Plasma ◽  
Composite Electrodes ◽  
Plasma Parameters ◽  
Gas Atmosphere ◽  
Electric Arc Discharge ◽  
Erosion Properties

This work deals with investigations of model plasma source realised as electric arc discharge in gas atmosphere between Cu-Cr composite electrodes. Radial distributions of temperature and electron density in arc plasma column were studied by optical emission spectroscopy. The content of electrode metals' vapours in discharge was calculated on the base of experimentally obtained plasma parameters as initial data. So, in this way the erosion properties of such composition can be determined.

scholarly journals Thermal Plasma of Electric Arc Discharge Between Composite Cu-Cr Electrsodes: Optical Emission and Electrode Surface Interaction

2020 ◽  
Vol 7 (2) ◽  
pp. 43-51
Author(s):  
A. Murmantsev ◽  
A. Veklich ◽  
V. Boretskij ◽  
M. Bartlová ◽  
L. Dostál ◽  
...  
Keyword(s):  
Thermal Plasma ◽  
Arc Discharge ◽  
Emission Spectra ◽  
Optical Emission ◽  
Electric Arc ◽  
Electrical Contacts ◽  
Copper Electrodes ◽  
Air Atmosphere ◽  
Electric Arc Discharge ◽  
Surface Modified

This work deals with investigations of thermal plasma of electric arc discharge between sintered composite Cu-Cr electrodes, which can be used in electrical contacts of vacuum circuit breakers. Breaking arcs between composite Cu-Cr as well as single-component copper electrodes were used to study the electrical properties, plasma optical emission and electrodes surface modification behavior. In particular, the temporal evolution of plasma emission spectra of electric breaking arcs in air atmosphere was investigated by Optical Emission Spectroscopy (OES). Scanning Electron Microscopy (SEM) with Energy-dispersive X-ray Spectroscopy (EDXS) were applied to analyze the cross-section of working layer of electrodes surface modified by the heat flux from the discharge.

scholarly journals Plasma Peculiarities of Arc Discharge Between Carbon-Copper Electrodes

2019 ◽  
Vol 6 (2) ◽  
pp. 152-155
Author(s):  
A. Veklich ◽  
S. Fesenko ◽  
V. Boretskij
Keyword(s):  
High Speed ◽  
Arc Discharge ◽  
Electric Arc ◽  
Arc Plasma ◽  
Composite Electrodes ◽  
Plasma Properties ◽  
Mutual Correlation ◽  
Copper Electrodes ◽  
Arc Discharges ◽  
Discharge Gap

Composite materials on carbon-copper base have advanced electric and exploitation characteristics. They usually used as materials for sliding contacts for high-speed railway. Arc discharges appear during pantograph lowering process in pantograph-catenary system, so injection of contact material into discharge gap has place. Therefore, investigations of electric arc plasma between such composite electrodes can be useful for further optimization of materials. It would be very useful as well to examine the peculiarities of electric arc plasma and contacts’ working surface interaction. So, the aim of this work is spectroscopy investigations of electric arc discharge plasma between C-Cu composite electrodes. The mutual correlation of plasma properties and composition of contacts’ was found.

scholarly journals SPECTROSCOPY PECULIARITIES OF ELECTRIC ARC DISCHARGE PLASMA WITH IRON VAPOURS

2021 ◽  
pp. 171-175
Author(s):  
A. Murmantsev ◽  
A. Veklich ◽  
V. Boretskij
Keyword(s):  
Discharge Plasma ◽  
Arc Discharge ◽  
Line Emission ◽  
Plasma Temperature ◽  
Optical Emission ◽  
Plasma Source ◽  
Electric Arc ◽  
Spectral Lines ◽  
Electric Arc Discharge

This work is devoted to spectroscopy peculiarities of electric arc discharge plasma with iron vapours. The solution of the main issue of optical emission spectroscopy, namely, selection of iron spectral lines, to study the parameters of non-uniform and non-steady-state plasma source, was considered within this paper. Specifically, the Boltzmann plots technique was used for detailed analysing of application possibility of Fe I spectral lines as well as for determination of plasma temperature. The spatial profiles of selected spectral line emission intensities were used to measure the radial distributions of plasma temperature of free-burning arc discharge between consumable electrodes at 3.5 A.

scholarly journals RF Sheath-Enhanced Plasma Surface Interaction Studies using Beryllium Optical Emission Spectroscopy in JET ITER-Like Wall

2017 ◽  
Vol 157 ◽  
pp. 03024
Author(s):  
C. Christopher Klepper ◽  
Laurent Colas ◽  
Alena Křivská ◽  
Volodymyr Bobkov ◽  
Philippe Jacquet ◽  
...  
Keyword(s):  
Emission Spectroscopy ◽  
Optical Emission Spectroscopy ◽  
Optical Emission ◽  
Surface Interaction ◽  
Plasma Surface ◽  
Interaction Studies

scholarly journals ESTIMATION OF THE ROLE OF RADIATION IN THE PLASMA OF ELECTRIC ARC DISCHARGE BETWEEN Cu-C COMPOSITES

2021 ◽  
pp. 157-161
Author(s):  
A. Veklich ◽  
S. Fesenko ◽  
A. Murmantsev ◽  
V. Boretskij
Keyword(s):  
Energy Balance ◽  
Balance Equation ◽  
Gaussian Approximation ◽  
Arc Discharge ◽  
Plasma Temperature ◽  
Radiation Energy ◽  
Energy Balance Equation ◽  
Electric Arc ◽  
Composite Electrodes ◽  
Electric Arc Discharge

This work is devoted to investigation of the radiation in the plasma of electric arc discharge between Cu-C composite electrodes and estimation of its contribution during the determination of electron density from the energy balance equation (Elenbaas-Heller). The contribution of radiation energy in heat transfer is estimated as well. The calculation is carried out based on the preliminary experimentally obtained radial distribution of plasma temperature. For the correct solution of the energy balance equation, a Gaussian approximation of the plasma temperature profile is used. Estimation of the total current was used as a criterion for the need to take into account the radiation in the diagnostics of electric arc plasma.

scholarly journals Carbon Nanofoam by Pulsed Electric Arc Discharges

2018 ◽  
Vol 2018 ◽  
pp. 1-10
Author(s):  
David Saucedo-Jimenez ◽  
Isaac Medina-Sanchez ◽  
Carlos Couder Castañeda
Keyword(s):  
Carbon Nanostructures ◽  
Arc Discharge ◽  
Low Cost ◽  
Molar Fraction ◽  
Electric Arc ◽  
Graphite Electrodes ◽  
Electric Arc Discharge ◽  
Pure Carbon ◽  
Arc Discharges ◽  
Dc Current

The aim of this article was to report the carbon nanofoam synthesis by a new method and a new catalytic mixture. Using the pulsed electric arc discharge method, carbon nanofoam was synthesized. The synthesis was carried out in a controlled atmosphere at 200 torr of hydrogen pressure. The pulsed electric arc discharge was established between two graphite electrodes with 22.8 kVA of power and 150 A DC current; the cathode was relatively motionless and was made of a pure carbon rod of 6 mm diameter, and the spinner anode was a pure carbon disc spinning at 600 rpm; over the disc was an annular cavity where the new catalytic mixture of 93.84/2.56/1.43/0.69/1.48 of C/Ni/Fe/Co/S molar fraction was deposited in a geometrically fixed way by 8 catalytic mixture blocks and 8 empty spaces, and the discharge frequency was 80 Hz. After the synthesis was made, the resulting products were deposited on the electrodes, proving that our method can synthesize different carbon nanostructures easily and at low cost.

Mathematical Simulation of Acoustic Characteristics of Super-Power Arc Discharges in Electric Steel Furnaces

2015 ◽  
Vol 792 ◽  
pp. 499-504
Author(s):  
Roman Bikeev ◽  
Viktor Serikov ◽  
Vladimir Cherednichenko
Keyword(s):  
Arc Discharge ◽  
Low Frequency ◽  
Sound Intensity ◽  
Electric Arc ◽  
Intensity Level ◽  
Discharge Column ◽  
Saha Equation ◽  
Electromechanical Oscillations ◽  
Noise Characteristics ◽  
Arc Discharges

Mathematical model of appearance and progress of noise characteristics in super-power electric arc steel furnaces is considered in the paper. It is shown that noise generation is coupled with pulsations of axial plasma flows in arc discharge caused by fluctuations of electrodynamic pressure on discharge column formed by interaction between its own magnetic field and current flowing in the arc. Simulation results have shown that pressure in arc axis alternates at frequency 100 Hz with amplitude 6600 N/m2 for arc current 80 kA. Basic frequencies of arc noise are aliquot to 100 Hz, that fact is verified by exploitation practice of arc steel furnaces. Sound intensity level in workspace riches 160 dB, but thanks to shielding by case and fused metal and slag it falls to 115–120 dB on service area of furnace. It has shown that maximal amplitudes in frequency spectrum of the noise are in range 5–150 Hz. Generated noise amplitudes and frequency ranges depend on arc discharges' resistance, which are defined by ionization level of gases. According to Saha equation, iron vapor is ionized by 70 %, calcium vapor – by 95 %, and ionization level of air is no more than 1.5 %. It has been experimentally shown that in melting of stock coated with lime noise intensity is decreased by 6–8 % against no-lime iron melting because of lower calcium ionization potential (6.11 eV). It has been ascertained that for long arc with high voltages the sound intensity is decreased by 3–4 % as compared with short arc of the same current. It has shown that suppression of low-frequency components of noise energy is possible by optimization of electromechanical oscillations of electrodes, electrode-holders and cable strips, additionally to inclusion lime in stock mixture. The appropriateness of improvement electric arc furnaces hermeticity and development of the furnaces for operation with lowered currents and enlarged transformers' voltages have been approved.

scholarly journals Arc discharges operation in “elion” mode

2021 ◽  
Vol 2064 (1) ◽  
pp. 012029
Author(s):  
I V Lopatin ◽  
Yu H Akhmadeev ◽  
S S Kovalsky ◽  
D Yu Ignatov
Keyword(s):  
Arc Discharge ◽  
Plasma Generator ◽  
System Operation ◽  
Plasma Parameters ◽  
Ion Plasma ◽  
Gas Plasma ◽  
Arc Discharges ◽  
Burning Voltage ◽  
System Operating ◽  
Probe Measurements

Abstract This paper presents the results of a study of an electron-ion-plasma alitization system using two arc plasma generators: a gas plasma generator based on a non-self-sustained arc discharge with a thermionic cathode “PINK” and a gas-metal plasma generator based on an arc discharge with a cathode spot. The system for discharges supplying and biasing of the samples assumes two sub-modes of operation: the ion cleaning sub-mode (ion sub-mode) and the sub-mode of samples electron heating (electron sub-mode), thus realizing the “elion” mode of the system operation. During the experiments, both the dependences of the average values of currents and voltages of discharges burning and probe measurements of the instantaneous plasma parameters values in both system operating sub-modes were investigated. It is shown, that the electron sub-mode of system operation is characterized by an increased burning voltage, which is caused by the formation of a positive anode drop of more than 10 V in the plasmas. Such a potential distribution in the discharges ensures effective heating of the samples by the discharges plasmas electron component.

Sign in / Sign up

Export Citation Format

Share Document