Physical model of the cathode spot retrograde motion

Bobrov, Yu. K.; Bystrov, V. P.; Rukhadze, A. A.

doi:10.1134/s1063784206050057

Cited by 9 publications

(3 citation statements)

References 6 publications

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“…Taking into account that the angle of microparticle spread from the cath ode spot obeys the cosine law, the amplitude and incli nation angle of the resulting field (and, consequently, average current transmitted by the cathode spot) depend on the position of the spot on the cathode sur face. Special attention is paid to the retrograde char acter of processes occurring in the cathode spot and dusty plasma upon overlaying of an external magnetic field [20][21][22][23][24]. The marked angles (Fig.…”

Section: Resultsmentioning

confidence: 99%

On the structure and properties of a material deposited from arc discharge plasma near the cathode and onto vacuum-chamber walls

Smolanov

Pan'kin

2014

J. Synch. Investig.

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Section: Resultsmentioning

confidence: 99%

On the structure and properties of a material deposited from arc discharge plasma near the cathode and onto vacuum-chamber walls

Smolanov

Pan'kin

2014

J. Synch. Investig.

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“…The fact that blowing does not begin at the very same time when the arc is created can be understood by the existence of a holding force, F h, which works against the Laplace force. Treating the arc column as a rigid body [7], F L is equal to I a .B. , where I a is the arc current, B the magnetic field and the arc length.…”

Section: Qualitative Description Of Magnetic Blowingmentioning

confidence: 99%

Magnetic Blowing of Break Arcs up to 360 VDC

Vassa¹,

Carvou

Rivoirard³

et al. 2010

2010 Proceedings of the 56th IEEE Holm Conference on Electrical Contacts

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The phenomenon of magnetic blowing allows drastic reduction in arc duration. It is of specific interest in DC applications, more specifically in automotive applications. Blowing exploits the action of the magnetic force on the transitory arc formed during circuit opening. A new contact was described in a previous paper in which the magnetic field required for blowing is generated by the contact material itself. In the present study, aimed at a more thorough analysis of magnetic blowing, an external adjustable magnetic field (up to 320 mT) was produced by placing magnets on each side of the contact. The experiments were performed for voltage values from 42 V DC to 360 V DC and currents up to 100 A, using a resistive circuit. For considered magnetic field values, no magnetic blowing was observed below a certain critical current. At high current, the arc duration was found to be approximately current independent, following a phenomenological B 1variation. Under 42 V DC and the maximum current of 100 A, the arc duration under 320 mT was reduced by a factor of 100 as compared to the arc duration under zero field. Qualitative account of the present phenomena is obtained by considering that blowing is governed by the competition between the magnetic force acting on the arc and the force acting against arc motion, originating from the enthalpy expense needed to move the arc from a heated region at the contact surface to a colder one.

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“…The second tendency is related to a problem of an increase in the pulse duration upon generation of microwave radiation although, even now, 1D station ary models are employed for the estimation of param eters of the explosive emission diodes [17]. In partic ular, vircators with a pulse duration of greater than 3 ms have been constructed.…”

mentioning

confidence: 99%