Control of vacuum arc source cathode spots contraction motion by changing electromagnetic field

Song, Xiangzhou; Wang, Qing; Lin, Zeng; Zhang, Puhui; Wang, Shuhao

doi:10.1088/2058-6272/aa8a30

Cited by 13 publications

(5 citation statements)

References 20 publications

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“…[16][17][18] Song et al studied the method of controlling the motion and contraction of the cathode surface spots in vacuum arcing using a magnetic eld and analyzed how the magnetic eld component affects the cathode surface spot trajectories. 19 Tong et al…”

Section: Introductionmentioning

confidence: 99%

Study on Impact of Gap Difference on Plasma Distribution of Direct Current Vacuum Circuit Breaker with Double-Break

Huang,

Yin,

Liu

et al. 2023

Preprint

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During the fault current breaking process of a mechanical direct current vacuum circuit breaker (DC VCB) with double-break (DB), the mechanism's dispersion can result in a gap difference between the two breaks. A DB DC VCB breaking experiment platform is constructed in order to investigate the impact of gap difference on plasma distribution during the DB DC VCB breaking process. During the experiment, a high-speed camera is used to capture the vacuum arcing process at the two breaks under varying gap difference conditions. Then, the arc feature parameters and their variations during the zero zone process are extracted using image processing techniques, and the distribution patterns of plasma and arc energy at the two breaks are analyzed and compared. When there is no gap difference between the two breaks of the experimental DB DC VCB, there are no significant differences in arc energy and the sizes of high, medium, and low-temperature plasma zones between the two breaks. When there is a gap difference between two breaks, the break with the smaller gap has larger high and medium-temperature plasma zones, more concentrated arc energy, higher particle concentration, lower arc diffusion velocity and arc energy decay velocity, and a greater amount of residual plasma after the extinguishing of the arc. When the gap difference exceeds a certain threshold, energy spots appear on the contact surfaces, and a high concentration corridor of residual particles remains between the contacts after the current crosses zero, forming a breakdown weak point that eventually leads to arc re-ignition (hence interruption failure) under the action of transient recovery voltage (TRV).

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Section: Introductionmentioning

confidence: 99%

Study on Impact of Gap Difference on Plasma Distribution of Direct Current Vacuum Circuit Breaker with Double-Break

Huang,

Yin,

Liu

et al. 2023

Preprint

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show abstract

“…The properties of cathode spots were mostly investigated by optical methods [3,9,11,12] because cathode spots are inherently non-stationary and thus impossible to pinpoint; hence, probe techniques are only of limited use due to constantly changing spot locations. Differential absorption imaging [13,14] and interferometry [15] based on an external light source (usually a pulsed laser) are powerful methods.…”

Section: Introductionmentioning

confidence: 99%

High-resolution observation of cathode spots in a magnetically steered vacuum arc plasma source

Oh¹,

Kalanov²,

Anders³

2021

Plasma Sources Sci. Technol.

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The properties of cathode spots in a magnetically steered vacuum arc plasma source were investigated. The cathode spots were observed with a long-distance microscope coupled to a streak camera, where the entrance slit of the camera was aligned with one of the linear sections of the steered arc source. This is a key feature that allows the observation of spots as they appear along the erosion racetrack. The trends of spot motion and patterns in the emitted light were observed with different sweep times. The streak images were analysed by fast Fourier transformation to check for the presence or absence of characteristic features like characteristic spot lifetimes, since their existence remains a disputed issue. We found that the power spectrum of the arc spot fluctuations does not show any specific frequencies or related times, rather, the spot fluctuations have a broad spectrum following a power law (spectral power density versus frequency), which is indicative for the fractal (self-similar) nature of spot processes. Moreover, we show that-at about 300 MHz under our conditions-we reach the ultimate temporal resolution limit of the method, which is associated with the finite lifetime of excited atomic and ion states. This is a fundamental limit given by the physics of atoms and ions, not a measurement flaw. The temporal resolution limit of about 3 ns also implies a spatial resolution limit of order of a few μm given that radiating species move laterally to the observation direction with at least 10 3 m s −1 .

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“…In a low-current pulsed vacuum discharge, a supersonic (∼10 4 m s −1 ) metal plasma jet can be generated by ablating the cathode material [1][2][3][4][5][6][7], which can be applied to ion implantation technology, extraction of highly ionized ion beams and pulsed plasma thrusters [8][9][10][11][12][13][14].…”

Section: Introductionmentioning

confidence: 99%

Study of the influence of discharge loop parameters on anode side on generation characteristics of metal plasma jet in a pulsed vacuum discharge

Zhang¹,

Liu²,

Tian³

et al. 2021

Plasma Sci. Technol.

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In a pulsed vacuum discharge, the ejection performance of a metal plasma jet can be effectively improved by preventing charged particles from moving to the anode. In this paper, the effects of resistance and capacitance on the anode side on the discharge characteristics and the generation characteristics of plasma jet are investigated. Results show that the existence of a resistor on the anode side can increase the anode potential, thereby preventing charged particles from entering the anode and promoting the ejection of charged particles along the axis of the insulating sleeve nozzle. The application of a capacitor on the anode side can not only absorb electrons at the initial stage of discharge, increasing the peak value of the cathode hump potential, but also prevent charged particles from moving to the anode, thereby improving the ejection performance of the plasma jet. In addition, the use of a larger resistance and a smaller capacitance can improve the blocking effect on charged particles and further improve the ejection performance of the plasma jet. Results of this study will provide a reference for the improvement of the ejection performance of plasma jets and their applications.

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Control of vacuum arc source cathode spots contraction motion by changing electromagnetic field

Cited by 13 publications

References 20 publications

Study on Impact of Gap Difference on Plasma Distribution of Direct Current Vacuum Circuit Breaker with Double-Break

Study on Impact of Gap Difference on Plasma Distribution of Direct Current Vacuum Circuit Breaker with Double-Break

High-resolution observation of cathode spots in a magnetically steered vacuum arc plasma source

Study of the influence of discharge loop parameters on anode side on generation characteristics of metal plasma jet in a pulsed vacuum discharge

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