Generation of Anode Spot in Low‐Current DC Vacuum Arcs by the Effect of Embedded Magnet in the Anode

Kobayashi, Kazuki; Wanninayake, W. M. R. R.; Yanagidaira, Takeshi; Sato, Naoyuki; Tsuruta, K.

doi:10.1002/tee.20262

Cited by 2 publications

(2 citation statements)

References 2 publications

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“…The arc plasma was constricted to the anode side and strongly concentrated at the center of the anode surface by the effect of the strong magnetic field. The strong radiation shows the generation of the anodic spot [3]. The center of the anode always continues to be heated by the bombardment of the electrons and evaporates the anode material.…”

Section: Under Magnetic Fieldmentioning

confidence: 99%

Spectroscopic Analysis of the Effect of Magnetic Field on Low Current DC Vacuum Arc Plasma

Wanninayake¹,

Kobayashi²,

Yanagidaira³

et al. 2010

IEEJ Transactions Elec Engng

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Effects of a magnetic field on the characteristics of a low-current DC vacuum arc plasma of less than 30 A were examined by arranging the electrodes in a straight line or perpendicularly. Two types of magnetic fields were applied to the gap by embedding a small column magnet inside the electrode and arranging a disc magnet at the back side of the electrode. The arc plasma forms a column depending on the magnetic field distribution and an anode spot is generated under strong magnetic field on the anode side. Spectroscopic analysis of emissions from cathode and anode showed that the cathode metal ions arrive at the anode and the anode metal ions arrive at the cathode along the magnetic field, but neutrals are not guided by the magnetic field and only a small part of the neutrals arrive at the opposite electrode in the perpendicular arrangement. 

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Section: Under Magnetic Fieldmentioning

confidence: 99%

Spectroscopic Analysis of the Effect of Magnetic Field on Low Current DC Vacuum Arc Plasma

Wanninayake¹,

Kobayashi²,

Yanagidaira³

et al. 2010

IEEJ Transactions Elec Engng

Self Cite

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“…The additional axial magnetic field (AMF) in the vacuum arc area reduces the arc voltage, thereby increasing the critical current that forms the anode spot [3]. However, when the AMF strength exceeds the critical magnetic value, even if the AMF strength continues to increase, the arc voltage changes little, which is not conducive to inhibition the anode spot [4]. Currently, the most widely used contact structures for generating AMF are coil-typed AMF contact and cup-shaped AMF contact.…”

Section: Introductionmentioning

confidence: 99%

Research on Magnetic Field Distribution between Electrodes in Vacuum Interrupter

Zhao

Wang

et al. 2020

IEEJ Transactions Elec Engng

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Vacuum circuit breaker is a kind of power equipment widely used in the power system. It is developing toward the direction of high voltage and high current. How to design the contact to maximize the interrupting capacity of the contact system has been conducted by scholars. In this paper, the magnetic field simulation model of contact system is established, the magnetic field distribution characteristics of vacuum interrupters are studied, and the distribution characteristics of the magnetic field in the half cycle of the cup-shaped axial magnetic field contact system are simulated and analyzed. On this basis, by changing the contact structure parameters, the effects of the number of slots in the cup, the slot angle, the center hole of the contacts, and the length of the slots on the distribution of the axial magnetic field were obtained. The results show that grooving the contact can reduce the eddy current, but it has a limited effect on reducing residual magnetic field. The increase of slot angle of contact cup can effectively reduce the residual axial magnetic field at the zero current moment and the axial magnetic field intensity at the peak current moment. Based on the above research results, a new embedded axial magnetic contact system with 12 slots embedded magnetic ring and reverse contact cup is designed. The embedded magnetic ring and reverse spiral slot increase the axial magnetic field at the peak current moment and reduce the residual axial magnetic field at the zero current moment. Finally, the characteristics of the magnetic field have been improved significantly compared with the magnetic field of traditional cup-shaped axial magnetic field contact.

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Generation of Anode Spot in Low‐Current DC Vacuum Arcs by the Effect of Embedded Magnet in the Anode

Cited by 2 publications

References 2 publications

Spectroscopic Analysis of the Effect of Magnetic Field on Low Current DC Vacuum Arc Plasma

Spectroscopic Analysis of the Effect of Magnetic Field on Low Current DC Vacuum Arc Plasma

Research on Magnetic Field Distribution between Electrodes in Vacuum Interrupter

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