Magnetically driven high current switching arcs in vacuum and low pressure gas

Teichmann, J.; Romheld, M.; Hartmann, Werner

doi:10.1109/27.782274

Cited by 30 publications

(11 citation statements)

References 5 publications

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“…(I), we get a weak dependence on ocwU: Hence, we have to make additional assumptions and/or use empirical relations for at least two more variables. The previous solutions of [1] and [2] are presented in the following, and compared to the new solution attempted in this work.…”

Section: B Momentum Balancementioning

confidence: 97%

“…The heat fluxes QKH / QAH are the respective cathode heating / anode heating heat fluxes, while and QAV / QKV are the heat fluxes corresponding to evaporation from anode and cathode: aO U I = QA + QK QAH + QAV + QKH + QKV (1) QA and QK are assumed to be proportional to the corresponding root cross section FA, FK:…”

Section: Arc Model a Energy Balancementioning

confidence: 99%

“…Semi-quantitative models (c., i.e. [1]... [3] and references therein) do not take care of the detailed physics occurring in arc roots, whence it is the purpose of this and ongoing work to get a more physics based model in these aspects also. Arc model…”

Section: Introductionmentioning

confidence: 99%

“…The arc model used in this work is an extension of the work published earlier [1]. The contact geometry is shown schematically in fig.…”

Section: Introductionmentioning

confidence: 99%

“…In particular, evaporation from the contacts and the corresponding cooling is treated quantitatively, using empirical relations from arc voltage and root diameter measurements at anode and cathode [2]. Heating, evaporation and cooling rates are determined quantitatively, in contrast to earlier work where simplifying assumptions had been made for these quantities [1], [3]. The refined arc model provides parameters like the arc velocity, which are compared to experimental results (see below).…”

Section: Introductionmentioning

confidence: 99%

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Thermodynamic Model of Moving Vacuum Arcs on Contrate Contacts

Branston

Haas

Hartmann

et al. 2006

2006 International Symposium on Discharges and Electrical Insulation in Vacuum

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The behavior of constricted vacuum arcs on Radial Magnetic Field (RMF) contacts in vacuum tubes of medium voltage circuit breakers strongly determines the breaking capacity of these contact systems. The movement of these arcs under the influence of the RMF is investigated with the help of a one-dimensional (1D) thermodynamic model of the arc and its interaction with the contact surface. Heat conduction and evaporation are taken care of analytically, while the size of the arc root and, hence, its current density has been determined experimentally. The energy balance is solved by using empirical values for the respective sheath voltage drops. It is complemented by a momentum balance incorporating neutral vapor loss from the arc boundaries, which is found to be essential for the quantitative understanding of the arc physics. A time-dependent analysis of the arc properties like the arc velocity during a sine half-wave produces a good agreement with experimental values measured for different sizes of contrate contacts. The model is explained and compared to experimental results of arc velocity and experimentally determined switching capacity, respectively.

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Section: B Momentum Balancementioning

confidence: 97%

Section: Arc Model a Energy Balancementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

“…The arc model used in this work is an extension of the work published earlier [1]. The contact geometry is shown schematically in fig.…”

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Thermodynamic Model of Moving Vacuum Arcs on Contrate Contacts

Branston

Haas

Hartmann

et al. 2006

2006 International Symposium on Discharges and Electrical Insulation in Vacuum

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View full text Add to dashboard Cite

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Study on arc mode and shape transformation in the arc motion stage between transverse magnetic field contacts

Pang

Wang

Xiu

et al. 2018

Contributions to Plasma Physics

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Transverse magnetic field (TMF) contacts drive the vacuum arc moving along the contact surface by producing a magnetic field perpendicular to the arc current flow, which makes the arc energy distribute uniformly and prevents the contact from serious ablation due to local overheating. The characteristics of arc motion between the TMF contacts directly determine the surface temperature distribution and contact erosion. Also, it is closely related to the breaking ability of the contacts. In this paper, the arc motion between spiral-type contacts was recorded by a high-speed camera. By analysing the arc voltage and arc images, the characteristics of arc shape transformation in the motion stage under different currents were studied. At the same time, the influence of arc duration and arc characteristics before the motion stage on the arc motion is discussed. It is found that the arc behaviour before the motion stage did influence the shape transformation and range of arc rotation. After entering the motion stage, there was always a rapid transformation process of the arc shape and the arc would return to where it first became constricted after a short movement. After a continuous movement, it might rotate in a small region where the arc stagnated before the motion stage. In addition, the arc behaviour was also related to its duration. When the opening time was varied from 2 to 5 ms, the arc velocity decreased. Meanwhile, it was more likely that multiple transformations of the arc aggregation degree occurred.

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