AMF vacuum arcs at large contact separation

Hartmann, Werner; Haas, W.; Romheld, M.; Wenzel, N.

doi:10.1109/deiv.2004.1422644

Cited by 14 publications

(5 citation statements)

References 2 publications

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“…Using high-speed camera, later researchers studied the influence of larger distance on arc appearance. Xiu et al [12] studied three kinds of AMF contacts (cup-shaped electrode, two-segment coil electrode, and three-segment coil electrode) in very long contact gaps (40-60 mm) and found the VA distortion phenomena, that the weakening of AMF between two electrodes resulted in arc distortion, and that large-diameter electrodes would increase the stability of VA. Hartmann et al [13] paid more attention to high-current VA at larger gap distances (10-40 mm). They also paid more attention to cathode spots phenomena and dynamic VA structure under AMF [14].…”

Section: Introductionmentioning

confidence: 98%

Experimental Investigation on Vacuum Arc Behaviors Subjected to Larger Diameter Cup-Shaped and Coil-Shaped Axial Magnetic Field Electrode

Wang

Deng

et al. 2015

IEEE Trans. Plasma Sci.

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In this paper, high-current vacuum arc (VA) breaking experiments in vacuum interrupters were conducted using two kinds of high-capacity (larger diameter) axial magnetic field (AMF) electrodes with contact gap distance changing from 10 to 40 mm. Triggering arc mode and fixed gap distance were adopted. Experimental results showed that during the initial diffusion stage, the arc voltage of high-current VA got a peak value. The change in high-current VA appearance would also affect the curve of arc voltage. With the increase of contact gap distance, the voltage of high-current VA increased and the VA near the anode appeared contracted, and its shape was changed from cylinder to cone. In the shorter gap distance, for cup electrodes, the plasma jets mix with each other and the arc column appears like a bright cone, whereas for coil electrodes, the plasma jets are clear and the column appears like a cylinder, and the transfer of arc appearance affects arc voltage distribution. Moreover, arc twist and rotation often occur under longer gap and higher current, which is due to the larger radial magnetic field component generated by AMF coils, and arc voltage appeared high-frequency and high-amplitude noise, and ultimately resulted in the distortion of the arc current in the current experimental conditions (lower charging voltage of capacitor).Index Terms-Arc distortion, axial magnetic field (AMF), gap distance, high-capacity electrode, high-current vacuum arc (VA).

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Section: Introductionmentioning

confidence: 98%

Experimental Investigation on Vacuum Arc Behaviors Subjected to Larger Diameter Cup-Shaped and Coil-Shaped Axial Magnetic Field Electrode

Wang

Deng

et al. 2015

IEEE Trans. Plasma Sci.

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“…Although a few papers studied the vacuum-arc behaviors at large contact gaps [2], [6], [8], [9], which are valuable information to improve our understanding on vacuum arcs in that situation, the knowledge of the vacuum-arc behaviors at large contact gaps still need to be extended. Saitoh et al [2] described the interrupting performance of a 145-kV 40-kA one break VCB.…”

Section: Introductionmentioning

confidence: 98%

“…Liu et al [6] discussed the high-current interrupting technology with large contact gap. Hartmann et al [8] explored the feasibility of slot-type AMF contacts for applications at large contact gap. High-speed video observation and high-current interruption were performed at contact strokes of several tens of millimeters.…”

Section: Introductionmentioning

confidence: 99%

Vacuum-Arc Behaviors of a Coil-Type Axial-Magnetic-Field Contact at Contact Gap of 60 mm

Xiu

Liu

Wang

2008

IEEE Trans. Plasma Sci.

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Contact gap is usually high in high-voltage vacuum circuit breakers (VCBs). We experimentally investigated vacuum-arc behaviors of a coil-type axial-magnetic-field (AMF) contact with a contact diameter of 100 mm and a contact gap of 60 mm, which included vacuum-arc appearance observation and LC discharging current interrupting test. The vacuum arc was ignited by a trigger needle in a demountable vacuum chamber, and the vacuum-arc appearance was recorded by a high-speed chargecoupled-device camera. The LC discharging current interrupting tests were done by using a VCB with the coil-type AMF contacts in the vacuum interrupters. Vacuum-arc appearance with current peak values of 11.3, 17.0, and 22.7 kA (current frequency of 50 Hz) was shown in diffuse mode, although there was an unstable period at the beginning of arcing period. The LC discharging current interrupting test showed that there was no second half-wave until a 50-kA rms current. When the contact gap increases from 40 to 60 mm, arc-voltage noise oscillation increases, and arc voltage at current peak almost doubled in the range of arc current from 10 to 50 kA. When the peak arc-current value increases from 11.3 to 17.0 and 22.7 kA, both the arc-voltage noise amplitude and the arc-voltage noise duration increase.Index Terms-Axial magnetic field (AMF), vacuum arcs, vacuum interrupter.

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“…ACUUM interrupter is nowadays the most widely used switching technology for medium voltage applications, whereas SF 6 interrupter is the dominant technology in high voltage applications. In an attempt to develop SF 6 free alternative circuit breakers owing to environmental considerations, research efforts are currently being made to increase the voltage rating of vacuum interrupters [1,2]. As a result, the behavior of a vacuum arc (VA) for contact gap above 10 mm needs to be better understood.…”

Section: Introductionmentioning

confidence: 99%

Arc Appearance and Cathode Spot Distribution in a Long-Gap High-Current Vacuum Arc Controlled by an External Axial Magnetic Field

Montcel

Chapelle

Creusot

et al. 2018

IEEE Trans. Plasma Sci.

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AMF vacuum arcs at large contact separation

Cited by 14 publications

References 2 publications

Experimental Investigation on Vacuum Arc Behaviors Subjected to Larger Diameter Cup-Shaped and Coil-Shaped Axial Magnetic Field Electrode

Experimental Investigation on Vacuum Arc Behaviors Subjected to Larger Diameter Cup-Shaped and Coil-Shaped Axial Magnetic Field Electrode

Vacuum-Arc Behaviors of a Coil-Type Axial-Magnetic-Field Contact at Contact Gap of 60 mm

Arc Appearance and Cathode Spot Distribution in a Long-Gap High-Current Vacuum Arc Controlled by an External Axial Magnetic Field

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