Experimental Investigation of Arc Ignition Modes of Vacuum Arc Under Transverse Magnetic Field

Feng, Dongxia; Xiu, Shixin; Wang, Yi; Liu, Gang; Zhang, Yali; Li, Ning

doi:10.1109/tps.2015.2412380

Cited by 20 publications

(4 citation statements)

References 15 publications

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“…As shown in Figure , without BMF for the Wan‐type TMF contact, the arc voltage is higher than that of the cup‐type AMF contact, and typically the stable arc voltage is about 58 V. With increasing magnetic field strength, the arc voltage increases and then it becomes unstable. Typically, when the magnetic field strength is 4.7 mT/kA, the stable arcing voltage is about 98 V, which is higher than that of the cup‐type AMF contact.…”

Section: Test Results and Analysismentioning

confidence: 93%

Influence of bias magnetic field on the vacuum arc in double‐break vacuum circuit breakers

Liao

Qiao

Lü

et al. 2018

Contributions to Plasma Physics

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When double-break vacuum circuit breakers (VCBs) interrupt the fault current, the series arc will generate their individual magnetic fields in different breaks. The magnetic field in one break will influence the arc in another break if the magnetic field is strong enough or the two breaks are very close. In this case, an interactive magnetic field effect happens. This field is also called the bias magnetic field (BMF). BMF can cause anode erosion and affect the performance at current zero. The distribution of BMF and the optimal configuration of the double-break VCBs were obtained by the electromagnetic field simulation using the Ansoft Maxwell software. Based on the simulated magnetic field data, in the experiments, the interaction between the series vacuum arcs in double-break VCBs was equivalent to the interaction between a single vacuum arc and the magnetic field generated by a Helmholtz coil. A high-speed CMOS camera was used to record the trajectory of the vacuum arc plasma under different BMFs with different types of contacts. The results show the BMF can increase the arc voltage, and the arc becomes unstable. When the BMF becomes stronger, the arc voltage increases, and the arc becomes more unstable. In addition, for different types of contacts, the development process of the arc and the influence level are different under the same BMF. For a Wan-type transverse magnetic field (TMF) contact or strong BMF, metal sputtering is evident and anode erosion becomes serious. For a cup-type axial magnetic field (AMF) contact, the influence of BMF on the series arc plasma in double-break VCBs is less than that of the Wan-type TMF contact. The results of this work may be helpful for the design of compact double-break VCBs.

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Section: Test Results and Analysismentioning

confidence: 93%

Influence of bias magnetic field on the vacuum arc in double‐break vacuum circuit breakers

Liao

Qiao

Lü

et al. 2018

Contributions to Plasma Physics

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“…When the peak current was under about 18 kA, the arc during the instability stage had parallel multiple columns starting from either single or multiple arc ignition points [16]. It was found that parallel multiple columns could be formed by the splitting of the expansion arc column that was expanded in the Ampere force direction formed from single-point ignition or the splitting of the merged arc column formed from multipoint ignition.…”

Section: Parallel Multi-column Instability Modementioning

confidence: 99%

“…When the contacts were separated, a transient arc column (bridge column) formed after the initial bridge exploded [15]. Usually arc ignition was at a single point, but sometimes it was at multiple points [16]. The voltage rose by about 20 V at the beginning of this stage.…”

Section: Ignition and Expansion Stagementioning

confidence: 99%

Arc characteristics during the instability stage on transverse magnetic field contacts

Pang

Liu

Xiu

et al. 2018

Plasma Sci. Technol.

Self Cite

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The arcing process greatly affects the breaking ability after current zero. The instability stage is the transition stage from the ignition to the movement stage, which affects the arc movement characteristics. In this paper, the arc characteristics during the instability stage on spiral-type contacts were investigated using a high-speed video camera. A multi-column parallel instability mode and a single-column instability mode were found during the instability stage. The arc appearance and constriction degree changed rapidly. The arc voltage usually increased accompanied by fluctuations. In addition, it was found that the current significantly influenced the arc mode and duration in the instability stage. With increased peak current, the probability of a single-column instability mode increased, and the fluctuation range and average time decreased.

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“…Meanwhile, the Lorentz force had an impact on the arcs in turn. Besides, the magnetic field intensity of the two breakers was different, that means there were some relationship, influence or law between these two magnetic fields of the two breaks 4,5 . According to previous study, transverse magnetic field intensity, making the cathode spot rotating on the contact surface to get cool was a crucial factor affecting the tracing and burning time of arc 6 .…”

Section: Introductionmentioning

confidence: 99%

Study of plasma-related parameters and self- generated TMF of contact under DB-DC VCB delayed breaking conditions

Yang,

Huang,

Shan

et al. 2024

Preprint

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Taking the mechanical double-break DC vacuum circuit breaker as the research object, the magnetic field and temperature field distribution between the breaks and the plasma characteristics under the working condition of gap difference caused by actuator dispersion are investigated to explore the difference of arc characteristics between the two breaks with different gaps. Based on the system of equations of Maxwell and magnetohydrodynamic (MHD) equations, a non-simultaneous breaking model of the DB DC VCB is established, and parameters such as magnetic flux density, plasma velocity, inter-contact pressure, and ion and electron temperatures are calculated. The simulation results show that the cathode surface field emission effect is stronger in the small gap break (delayed breaking break). Besides, in the small gap break, the arc temperature in is higher, the rate of decrease of temperature is lower, the electron velocity is higher, the magnetic flux density is lower, the regulatory ability of magnetic field is weaker, and the plasma diffusion speed is slower. In the arc ignition stage, the arc aggregation state duration of small gap break is longer than the normal break, and the arc transition time in small gap break is increased, which means the arc in small gap break get diffusion state later, and it is not conducive to the plasma diffusion and arc energy dissipation. Therefore, the arc energy density between delayed breaking break is greater, the arc morphology transition time is longer, the residual particle concentration after arc extinguishing is higher, and the probability of re-strike breakdown increases with the increase of gap difference. Improving the synchronization of the actuator could improving the breaking ability of DB DC VCB.

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Experimental Investigation of Arc Ignition Modes of Vacuum Arc Under Transverse Magnetic Field

Cited by 20 publications

References 15 publications

Influence of bias magnetic field on the vacuum arc in double‐break vacuum circuit breakers

Influence of bias magnetic field on the vacuum arc in double‐break vacuum circuit breakers

Arc characteristics during the instability stage on transverse magnetic field contacts

Study of plasma-related parameters and self- generated TMF of contact under DB-DC VCB delayed breaking conditions

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