An improved arc model for vacuum arc regarding anode spot modes

This paper introduces an improved arc model for vacuum arcs. In this model, the impact of different high-current anode modes is considered. An existence diagram for different high-current anode modes including footpoint, anode spot type 1 and type 2 is determined using emission spectroscopy, high-sp...

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Bibliographic Details
Published in:IEEE transactions on dielectrics and electrical insulation 2019-02, Vol.26 (1), p.120-128
Main Authors: Khakpour, A., Franke, St, Methling, R., Gortschakow, S., Uhrlandt, D., Imani, M. T.
Format: Article
Language:English
Subjects:
Alternating current
anode modes
Anodes
arc voltage
Cathodes
Discharges (electric)
displacement curve
Electric arcs
Electric contacts
Electric potential
Electrical measurement
Evaporation rate
High current
High speed cameras
Interrupters
Mathematical model
Mathematical models
Parameters
Physical properties
Spectroscopy
Threshold currents
vacuum arc
Vacuum arcs
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Summary:This paper introduces an improved arc model for vacuum arcs. In this model, the impact of different high-current anode modes is considered. An existence diagram for different high-current anode modes including footpoint, anode spot type 1 and type 2 is determined using emission spectroscopy, high-speed camera, and electrical measurements. During transition from diffuse to the high-current mode the arc voltage will be affected due to high evaporation rate, which can affect dielectric recovery of vacuum interrupter. Conventional arc models cannot trace the corresponding sudden changes in the arc voltage during the transition to anode spot type 2. Therefore, different areas of discharge modes are determined based on the threshold current and gap length for AC 50 Hz and cylindrical contacts made of CuCr7525. The physical parameters of the arc, e.g. the arc temperature, contact geometry and material is considered as implicit parameters in the existence diagrams. The boundaries of the areas are used as a user-defined library in EMTP-RV for a new electric arc model. The voltage behavior of the arc can be predicted well in a larger range of peak currents by the results. The validity of the model is also investigated for AC 100 Hz and pulsed DC 10 ms.
ISSN:1070-9878
1558-4135
DOI:10.1109/TDEI.2018.007587