Moving Arc Study and Plasma Diagnosis in Vacuum Interrupters With TMF Contacts

Pavelescu, D.; Dumitrescu, G.; Pavelescu, G.; Gherendi, F.; Nitu, S.; Braic, V.; Anghelita, P.

doi:10.1109/tps.2007.901976

Cited by 10 publications

(2 citation statements)

References 9 publications

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“…zone is described in [6,7]. In the case of high power circuit breakers in short-circuit regime the Post-arc current presents a specific structure.…”

Section: The Quality Of the High Current Interruption -Post-arc Cumentioning

confidence: 99%

Sintered electrical contacts for vacuum current interruption

Lungu¹,

Enescu²,

Lungu³

et al. 2008

2008 23rd International Symposium on Discharges and Electrical Insulation in Vacuum

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The paper presents the experiments of elaboration copper-chromium electrical contacts, with 40-75 % copper content, manufactured by powder metallurgy techniques: infiltration with copper of a chromium frame and solid state sintering of chromium and copper powder mixture. The influence of technological parameters -powder granulometry, compacting pressure, sintering and infiltration temperature -on the physical (density, hardness) and microstructural characteristics of contacts are presented. The elaborated contacts were tested in order to determine their properties in the case of high currents interruption.

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“…zone is described in [6,7]. In the case of high power circuit breakers in short-circuit regime the Post-arc current presents a specific structure.…”

Section: The Quality Of the High Current Interruption -Post-arc Cumentioning

confidence: 99%

Sintered electrical contacts for vacuum current interruption

Lungu¹,

Enescu²,

Lungu³

et al. 2008

2008 23rd International Symposium on Discharges and Electrical Insulation in Vacuum

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“…Until now, lots of research has been done on the transverse magnetic field (TMF) contacts at line frequency (50 Hz), and simulations on several models have been developed [1∼3] in order to understand the physical behavior of these TMF vacuum arcs. To increase the interruption ability by preventing local heating of the electrode, the relationship between the arc behavior and the interruption ability was studied at line frequency [4,5] . Based on research results above, controlled experiments using TMF contacts and axial magnetic field (AMF) contacts were performed.…”

Section: Introductionmentioning

confidence: 99%

The Dynamic Volt-Ampere Characteristics of a Vacuum Arc at Intermediate-Frequency Under a Transverse Magnetic Field

Zhu

Liu

et al. 2013

Plasma Sci. Technol.

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In this study, the changes of a vacuum arc's appearance were observed and the volt-ampere characteristics of the vacuum arc at intermediate frequency were analyzed under a transverse magnetic field (TMF). The TMF and phase shift time were calculated by using the TMF contact model and the large phase shift of the magnetic field at a higher frequency was conductive to the dispersion process of residual plasma. The arc velocity was higher at 800 Hz than at 400 Hz. It can be inferred that TMF will encourage arc movement at 800 Hz. Moreover, the arc movement has an impact on the arc voltage. Because of the increasing length of the arc column with a high arc velocity, the elongated arc causes the arc voltage to increase. Specifically, the volt-ampere characteristics of the vacuum arc are divided into three stages in this paper. The higher the frequency, the greater the initial rate of rise in the arc voltage and the larger the area surrounded by arc volt-ampere characteristics. The correlations between the arc voltage and the amplitude and frequency of the current are also presented.

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Three-dimensional transient modeling and simulation of high-current multi-component vacuum arc under transverse magnetic field

Xie,

Wang,

Chen

et al. 2024

Journal of Applied Physics

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This paper established a three-dimensional transient MHD model of a high-current multi-component vacuum arc under a transverse magnetic field (TMF) to simulate the dynamic characteristics of plasma parameters in the uniform motion mode of a contracted arc under lower TMF. The model considered the ionization–recombination process among the multi-components and used the P1 model to calculate the thermal radiation losses. The simulation results show that the ion number density of The TMF arc is on the order 1024 m−3, and when the plasma temperature reaches 4.3 eV, the effects of thermal radiation cannot be ignored. The majority of the plasma from the cathode and anode undergo acceleration and then deceleration before finally intersecting at the center of the arc, creating an extreme value of the density and the pressure, where a large amount of kinetic energy is converted into internal energy. The arc will be bent and deflected under the action of the ampere force, and the deflection of Cu3+ is especially obvious. The TMF affects the collision strength of the jet in the intersection area and, thus, affects the ion density, in which the change of Cu2+ is dominant. The ionization–recombination process of ions is mainly determined by the electron temperature, which is affected by the arc current. As the current decreases, Cu1+ increases and Cu2+ and Cu3+ decrease, and the change in ionization rate is the main reason for the change in the proportion of each ionic component; the heat flux density to the anode and cathode is on the order of 1010 W/m2, which heats the front of the arc and ensures the stable movement of the arc. Meanwhile, due to the high ion number density, the ion heat flux accounts for the main part of the heat flux, and the anode exhibits a higher proportion of ion heat flux.

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Moving Arc Study and Plasma Diagnosis in Vacuum Interrupters With TMF Contacts

Cited by 10 publications

References 9 publications

Sintered electrical contacts for vacuum current interruption

Sintered electrical contacts for vacuum current interruption

The Dynamic Volt-Ampere Characteristics of a Vacuum Arc at Intermediate-Frequency Under a Transverse Magnetic Field

Three-dimensional transient modeling and simulation of high-current multi-component vacuum arc under transverse magnetic field

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