Effect of Amplitude and Inclination of Magnetic Field on Low-Current Vacuum Arc

Chaly, A.M.; Logatchev, A.A.; Zabello, K.K.; Shkol'nik, S.M.

doi:10.1109/tps.2007.901920

Cited by 31 publications

(7 citation statements)

References 11 publications

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“…Both the average current per CS and its growth rate with the tangential field in [1] are significantly less than in the present work. The common thing about [1] and the current work is that the CS current dependence under study is flat at small values of t B , which is not typical for other contact materials [4]. Analyzing the results it is reasonable to suggest that the average current per CS is constant at n B to t B ratio greater than 0.5.…”

Section: Resultsmentioning

confidence: 75%

“…In the experiments on CS movement the CS position defining method was similar to that descried in [4]. The CS trajectory was defined by the aggregate of CS positions from every filming frame.…”

Section: Resultsmentioning

confidence: 99%

“…The experimental setup used for the current experiment is described in [4] in detail, so here we will list some of its basic parameters. The arc under study burned in a contact system that was disposed in a demountable vacuum chamber under continuous pumping (p ≈ 10 -4 Pa).…”

Section: Techniquementioning

confidence: 99%

“…The photography results were saved into a computer and processed with a special software that allows counting the cathode spots and finding the CS position on the cathode in each of 60 frames. The software used is similar to that described in [4], but for the purpose of the current work its functionality has been extended. By the distribution of the number of frames in which the arc consisted of a certain number of cathode spots the mean current per CS (I s ) was calculated.…”

Section: Techniquementioning

confidence: 99%

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Experimental study of a short low-current vacuum arc on the electrodes of refractory metal

Chaly¹,

Minaev

Myatovich

et al. 2010

24th ISDEIV 2010

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In this work the average current per cathode spot (CS) and the velocity of CS motion in a short low-current vacuum arc was investigated on electrodes of Molybdenum, subjected to a magnetic field. The study was performed on electrodes of 30mm in diameter and 2mm gap at arc currents up to 300A. Two components of the external magnetic field were varied independently. The axial magnetic field (normal to the cathode plane) n B was varied from 0 to 0.1T and the transverse magnetic field (tangential to cathode plane) t B was varied from 0 to 0.3T. The dependence of the average current per CS on the magnetic field amplitude and its inclination to the cathode surface was found. The average current per CS was found to raise with t B the slower the greater the n B value. The CS velocity was found to be proportional to t B in case the current per CS at certain magnetic field value doesn't exceed the arc current. At fixed arc current the CS velocity saturates with t B . The Robson angle was found to be proportional to the magnetic field vector inclination to the cathode surface angle with a factor of ~0.5. The results obtained were compared with the data in references.

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Section: Resultsmentioning

confidence: 75%

Section: Resultsmentioning

confidence: 99%

Section: Techniquementioning

confidence: 99%

Section: Techniquementioning

confidence: 99%

See 2 more Smart Citations

Experimental study of a short low-current vacuum arc on the electrodes of refractory metal

Chaly¹,

Minaev

Myatovich

et al. 2010

24th ISDEIV 2010

View full text Add to dashboard Cite

show abstract

“…These results were obtained after the surface was trained long enough, being subjected to continuous remelting using CSs, as was also done in [9]. Note that the average current per CS at h = 4 mm in a free-burning arc with copper-chromium cathode is I 0 = 20 A/cm 2 , according to [10]. Therefore, a single CS for currents I ~ 100 A or greater was obtained only when the magnetic fields were B > 0.04 T. Fig.…”

Section: Methodsmentioning

confidence: 67%

Cathode spot velocity in tangential magnetic field on cathode of copper-chromium composition in vacuum

Chaly¹,

Zabello²,

Shkol'nik³

2014

2014 International Symposium on Discharges and Electrical Insulation in Vacuum (ISDEIV)

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The paper presents measurement results for cathode spot (CS) velocity V under action of a tangential magnetic field on a clean surface (refined by preceding arcing) of the cathode made of cupper-chromium (CuCr30) composition in vacuum. Measurements were performed in the range of currents I = (30 -250) A in arcs of different lengths, h = 2 mm and 4 mm. The induction of tangential magnetic field varied in the range B = (0.02 -0.15 ) T. The dependence of the CS velocity on the magnetic field induction was found to be linear: V = K·B. The constant K depends on the arc current for currents I  2I 0 . (where I 0 is the current per spot at B = 0). The maximum value of K (at I > 2I 0 ) depends on the arc gap length. These results are similar to the results obtained for CS on cathodes made of pure metal, but are at variance with the result of the work by Y.H. Fu (1990) for the CuCr25 cathode. The obtained results are compared with similar results obtained previously in the experiments with different pure metals: Cu, Mo and W      

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Cathode Spot Motion in a Transverse and in an Oblique Magnetic Field

Beilis

2020

Plasma and Spot Phenomena in Electrical Arcs

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Effect of Amplitude and Inclination of Magnetic Field on Low-Current Vacuum Arc

Cited by 31 publications

References 11 publications

Experimental study of a short low-current vacuum arc on the electrodes of refractory metal

Experimental study of a short low-current vacuum arc on the electrodes of refractory metal

Cathode spot velocity in tangential magnetic field on cathode of copper-chromium composition in vacuum

Cathode Spot Motion in a Transverse and in an Oblique Magnetic Field

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