Breakdown Phenomena Triggered by Microparticle in Vacuum Gap

Ejiri, Haruki; Kumada, Akiko; Hidaka, Kunihiko; Donen, Taiki; Kokura, Kentaro

doi:10.1109/deiv.2018.8537167

Cited by 7 publications

(9 citation statements)

References 8 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…By increasing the gap distance in this state, we expect that the alumina microparticles can be reliably removed. We can also assume that there will be cases in which the microparticles are welded to the electrodes . In such cases, we anticipate that the impact caused by the opening and closing movement will peel the welded microparticles from the electrodes.…”

Section: Discussionmentioning

confidence: 99%

“…We can also assume that there will be cases in which the microparticles are welded to the electrodes. 10 In such cases, we anticipate that the impact caused by the opening and closing movement will peel the welded microparticles from the electrodes. If the opening and closing is performed while voltage is being applied, an arc will be generated between the electrodes and the electrodes will be damaged.…”

Section: Effective Conditioning Methods For Microparticle Removalmentioning

confidence: 99%

“…Additionally, in some cases, the microparticles act as microprotrusions on the electrode and the electric field enhancement coefficient β increases. This may also lead to breakdowns . Furthermore, as in Cranberg's model, it is thought that breakdown results from metal vapor produced by the energy generated at collision.…”

Section: Introductionmentioning

confidence: 99%

“…This may also lead to breakdowns. 10 Furthermore, as in Cranberg's model, 11 it is thought that breakdown results from metal vapor produced by the energy generated at collision.…”

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Monte Carlo simulation of microparticle motion in vacuum gap

Ejiri

Kumada

Hidaka

et al. 2018

Electrical Engineering Japan

Self Cite

View full text Add to dashboard Cite

Breakdown voltages of vacuum gaps become lower when the gaps are contaminated by metallic and ceramic microparticles. In this paper, the motion of the microparticles in the gap is simulated using Monte Carlo method in order to evaluate the effect of parameters upon motion and the removal time of the microparticles. As the parameters, we focused on the material of the microparticle, the frequency, the peak value of the applied voltage, the gap length, and the diameter of the lower and upper electrodes. It turned out that the maximum time needed to remove all microparticles could be expressed as multiple regression function. It is suggested that the reliability of the microparticle removal can be increased by spark conditioning with opening/closing operation.

show abstract

Section: Discussionmentioning

confidence: 99%

Section: Effective Conditioning Methods For Microparticle Removalmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

“…This may also lead to breakdowns. 10 Furthermore, as in Cranberg's model, 11 it is thought that breakdown results from metal vapor produced by the energy generated at collision.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Monte Carlo simulation of microparticle motion in vacuum gap

Ejiri

Kumada

Hidaka

et al. 2018

Electrical Engineering Japan

Self Cite

View full text Add to dashboard Cite

show abstract

“…Breakdown phenomena that are triggered by microparticles in gas and vacuum insulation are widely reported both numerically and experimentally [1][2][3][4][5][6][7][8][9]. Understanding these phenomena is important for many prospective gas-switch applications, including those in pulsed-power technology [10,11], electrical insulation equipment [4,5], and medical science [12].…”

Section: Introductionmentioning

confidence: 99%

Theoretical and numerical studies of breakdown phenomena triggered by microparticle in nitrogen gaps

Sun

Zhou

Yang

et al. 2021

Plasma Sources Sci. Technol.

View full text Add to dashboard Cite

This paper studies microparticle-triggered breakdown phenomena in mm-scale nitrogen gaps based on theoretical analysis and numerical simulation. Secondary electron and field emission contributions are both considered when predicting the microparticle-initiated breakdown voltage. In the present model, the ionization coefficient of the microscale discharge is modified to recognize the significant reduction in the number of collisions that occurs when a microparticle is present. The theoretical analysis indicates that small particles have little influence on the gas-gap breakdown voltage unless field-emission effects are dominant. However, when large microparticles (radius 50 μm) are present, a significant decrease (more than 20%) in the minimum breakdown voltage can be observed regardless of the particle position in the gas gap. Therefore, one should endeavor to exclude large microparticles from the discharge process. A fluid model is then used to simulate the microparticle-initiated breakdown process in a gas switch. The microparticle radius is 10 μm and the distance between the microparticle and cathode is 1 μm. It can be found that the electrode–particle microdischarge generates regions of high-density plasma that finally trigger main-gap breakdown when a voltage of 2.5 kV–3.5 kV is applied. The calculated results are consistent with our theoretical analysis. This paper provides a quantitative research method to evaluate the influence of microparticles on gas breakdown and contributes to improving gas-switch insulation performance.

show abstract

Laser Diagnostics for Elucidation of Vacuum Arc Behavior

Kumada

2018

2018 28th International Symposium on Discharges and Electrical Insulation in Vacuum (ISDEIV)

View full text Add to dashboard Cite

Breakdown Phenomena Triggered by Microparticle in Vacuum Gap

Cited by 7 publications

References 8 publications

Monte Carlo simulation of microparticle motion in vacuum gap

Monte Carlo simulation of microparticle motion in vacuum gap

Theoretical and numerical studies of breakdown phenomena triggered by microparticle in nitrogen gaps

Laser Diagnostics for Elucidation of Vacuum Arc Behavior

Contact Info

Product

Resources

About