Heat transfer and cold cathode erosion in electric arc heaters

Marotta, A.; Sharakhovsky, L. I.

doi:10.1109/27.649588

Cited by 32 publications

(20 citation statements)

References 13 publications

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“…By definition UϵQ 0 /I, where Q 0 is total thermal flux entering to arc spot and I is the arc current. Both the thermal volt-equivalent U and the effective current density j ͑that take into account the thermal effect of the arc on the electrode surface͒ are increasing functions of the magnetic field, as shown by Marotta, 3 and hence can also increase the electrode surface temperature.…”

Section: Introductionmentioning

confidence: 96%

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The effect of arc velocity on cold electrode erosion

2004

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Results of experimental investigations of copper cathode erosion in a magnetically driven arc versus arc rotation velocity v are presented. The erosion rate measurements were carried out with the arc burning in air, for magnetic induction values B in the range of 0.005-0.386 T, axial air gas velocity of 7.65 ms Ϫ1 , and current of 292 A. It is shown that in the range of small values of v and B, the mass erosion rate diminishes with v and B. Then, the erosion remains constant for a certain range of v and B, and, subsequently, begins to grow. This information is very important for the correct use of magnetic fields to decrease erosion in arc heaters.

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Section: Introductionmentioning

confidence: 96%

“…Marotta's thermal model 3 shows that the electrode surface temperature T 0 , the arc current I and the arc spot velocity v are the main determining parameters for cold electrode erosion. The influence of the current on the erosion was studied in an earlier paper.…”

Section: Introductionmentioning

confidence: 99%

The effect of arc velocity on cold electrode erosion

2004

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“…Most frequently there are star and delta connections but other configurations have been also observed in practice [13]. As it can be seen from Figure 1, GAD columns can also form the star connection, although, there is no in the discharge chamber an object that could represent neutral point, like melt in the open-arc furnace.…”

Section: Gliding Arc Discharge As An Electric Loadmentioning

confidence: 79%

“…Gliding arc (GA) after ignition is sustained by power from the sine voltage source, and the arc voltage value depends, first of all, on the thermal processes taking place in the discharge column, which in turn depend on the discharge current and the cooling intensity of the discharge column (gas flow rate). During after-arc state, in the neighborhood of zero-current point, the inter-electrode voltage is the result of transient state and depends on power supply system parameters, like internal reactance, shunt capacitance as well as on auxiliary discharge parameters [12,13]. GAD operation in the three-electrode configuration is much more complicated, less predictive and still not completely elaborated.…”

Section: Gliding Arc Discharge As An Electric Loadmentioning

confidence: 99%

Properties of gliding arc (GA) reactors energized from AC/DC/AC power converters

Stryczewska

Komarzyniec

2010

2010 IEEE Region 8 International Conference on Computational Technologies in Electrical and Electronics Engineering (SIBIRCON)

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Industrial plasma reactors design requires knowledge of their characteristics at different conditions of power supply system. Gliding arc plasma (GAD) characteristics are very sensitive either on these parameters or the properties and dynamic of the plasma gas (velocity, kind of gas and its composition). Paper presents the results of investigations of the atmospheric pressure low temperature GAD plasma properties controlled by a power electronic inverter and by a transformer type power supply system. Measurements are performed for discharges in argon, nitrogen and their mixtures in three-electrode plasma reactor. AC/DC/AC inverter has operated as a current and voltage source.Index Terms-AC/DC/AC power conversion, plasma generation, power system, gliding arc discharge

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“…[8], under the condition of 20 kA power frequency current with arcing duration time of 9 ms, the CuW80 contact showed about 0.75 mg/C mass loss rate. Reference [9] reported the mass loss rate of commercial copper materials. In Refs.…”

Section: Introductionmentioning

confidence: 99%

Erosion of Cu–W contact material of SF₆ circuit breakers when making capacitor bank

Ding

Fang

2019

IEEJ Transactions Elec Engng

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For an SF 6 circuit breaker in capacitor bank-making operation, the inrush current may cause serious erosion to its arcing contacts. In order to observe the characteristics of this erosion, an arc extinguish chamber of SF 6 circuit breaker with Cu-W arcing contacts was designed, and experiments of capacitor bank making were carried out. The prebreakdown arcing duration and inrush current were measured, and the mass loss of the contact after 100 times of operation was calculated. Power-frequency-withstanding voltage was measured after every 20 operations. The surface status, scanning electron microscope (SEM), and energy dispersive x-ray spectroscopy (EDS) of the contact material were recorded. The characteristics and mechanism of arcing contact erosion in SF 6 circuit breaker in the making process were then analyzed. Compared to the case of breaking high current, this analysis found two major mechanisms that lead to severe arcing contact erosion in the case of capacitor bank making operation, namely, the arc erosion due to prebreakdown current and the erosion of arc heated contact due to friction. The erosion after contact caused by mechanical friction occupies a relatively larger proportion in the mass loss of contact materials. Under the conditions of 3 m/s making velocity, 18 kA current peak, and less than 2 ms arcing duration, the mechanical wear mass loss rate is greater than 1.0 mg/C.

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Heat transfer and cold cathode erosion in electric arc heaters

Cited by 32 publications

References 13 publications

The effect of arc velocity on cold electrode erosion

The effect of arc velocity on cold electrode erosion

Properties of gliding arc (GA) reactors energized from AC/DC/AC power converters

Erosion of Cu–W contact material of SF₆ circuit breakers when making capacitor bank

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Heat transfer and cold cathode erosion in electric arc heaters

Cited by 32 publications

References 13 publications

The effect of arc velocity on cold electrode erosion

The effect of arc velocity on cold electrode erosion

Properties of gliding arc (GA) reactors energized from AC/DC/AC power converters

Erosion of Cu–W contact material of SF6 circuit breakers when making capacitor bank

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Product

Resources

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Erosion of Cu–W contact material of SF₆ circuit breakers when making capacitor bank