Comparative study on breakdown characteristics of trigger gap and overvoltage gap in a gas pressurized closing switch

Zhai, Rongxiao; Huang, Tao; Cong, Peitian; Luo, Wei; Wang, Zhiguo; Zhang, Tianyang; Yin, Jun

doi:10.1088/2058-6272/aae432

Cited by 10 publications

(3 citation statements)

References 15 publications

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“…The fast-linear transformer driver (FLTD) is considered to be a new paradigm in the pulsed power generators, which are capable enough to generate a high-power pulse with a typical rise time few hundreds of ns without any supplementary pulse forming lines or compression units [1]. However, a large FLTD-based accelerator with tens of mega-amperes (MA's) and hundreds of terawatts (TW's) on a very large scale may require 10,000+ gas discharge closing switches, which are to be triggered synchronously or sequentially [2]. Additionally, each of these gas discharge closing switches should have an exceptional self-breakdown feature with minuscule pre-fire possibility and exhibit a good triggering characteristic's during the charging and triggering process respectively.…”

Section: Introductionmentioning

confidence: 99%

An experimental and numerical study: to investigate the switching characteristics of a field-distortion sparkgap switch in various SF₆ admixtures

Kumar,

Verma,

Singh

et al. 2023

Eng. Res. Express

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Pressurized sparkgap switch is one of the major components that is most commonly used in various pulsed-power systems and the stochastic closure time delay (t d ) and jitter (σ d ) in this gas discharge switch has substantial effect on the temporal characteristics of output pulse. Experimental investigations performed with various volumetric concentrations of SF6 in SF6-N2, SF6-dry air and SF6-Ar admixtures evidenced that the intrinsic parameters of the switch such as time delay and jitter were found to be strongly dependent on the nature of gas, volumetric concentration of SF6 in admixture and rate of rise of voltage (dV/dT) of applied trigger pulse for e.g. in SF6/N2 admixture experiments as the concentration of SF6 was increased from 5% to 50% the average time delay and jitter was consequently increased from 278 ns to 413 ns and 17 ns to 56 ns, respectively. The similar increasing trend was observed even in SF6/dry air and SF6/Ar admixture experiments. It was also observed in the investigation that the variation in time delay and jitter is relatively much lesser for the condition when fast rising trigger pulse having slew rates ∼500 V ns−1 is applied than that of trigger pulse with lower dV/dT of ∼3 V ns−1. To further corroborate the stochasticity of streamer discharge in experimented SF6 admixtures, numerical studies have also been carried out by using a Particle-In-Cell/Monte Carlo Collision (PIC/MCC) model. Our experimental and simulation results infer that SF6/Ar admixture with low SF6 concentration is a superior alternative than pure SF6 for pulsed power switching applications.

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Section: Introductionmentioning

confidence: 99%

An experimental and numerical study: to investigate the switching characteristics of a field-distortion sparkgap switch in various SF₆ admixtures

Kumar,

Verma,

Singh

et al. 2023

Eng. Res. Express

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“…The coefficient of variation of the self-breakdown voltage is a key evaluation factor for self-breakdown gas switches [10][11][12][13]. The coefficient of variation of the self-breakdown voltage η can be calculated from equations (1)-( 3),…”

Section: Introductionmentioning

confidence: 99%

Investigation on the electrode surface roughness effects on a repetitive self-breakdown gas switch

Zeng¹,

Li²,

Cai³

et al. 2022

Plasma Sci. Technol.

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The influence of the electrode surface roughness on the self-breakdown gas switch is investigated by physical analysis, computer simulation and experiment in this work. The Cu-W electrodes of different surface roughnesses were tested under the conditions of pulse repetitive frequency of 50 Hz, self-breakdown voltage of ~30 kV, and peak current of ~2 kA for ~93000 shots (total charge transferred was ~15 C). The coefficients of variations of the self-breakdown voltage of Cu-W 0.8, Cu-W 3.2 and Cu-W 12.5 electrodes were ~2.95%, ~1.62% and ~1.16%, respectively. With the increase of electrode roughness, the erosion area decreased continuously, indicating that the breakdown positions were more stable and the coefficient of variation of breakdown voltage decreased. The method that decreasing the coefficient of variation of the self-breakdown voltage by increasing the surface roughness of electrode greatly improves the stability of the self-breakdown switch, which is of significance to the application of the self-breakdown switch in the compact high-power pulse power devices for long time and stable operation.

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“…References [13][14][15] conducted a comprehensive study on the erosion characteristics of tungsten-copper alloy electrodes. From the perspective of structure, researchers have studied the effects of the discharge tube's electrode gap and electrode structure on the breakdown voltage, the response time, the current capacity, and other discharge tube characteristics [16][17][18][19]. In the field of spark gap switches, Gӧrtler and Heo covered the SiC material for its high thermal conductivity and melting point on the surface of the basic electrode to form an approximate double-layer electrode in order to reduce electrode surface erosion [20,21].…”

Section: Introductionmentioning

confidence: 99%

Reliability improvement of gas discharge tube by suppressing the formation of short-circuit pathways

Cheng¹,

Xiang²,

Li³

et al. 2022

Plasma Sci. Technol.

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After cumulative discharge of gas discharge tube (GDT), it is easy to form a short circuit pathway between the two electrodes, which increases the failure risk and causes severe influences on the protected object. To reduce the failure risk of GDT and improve cumulative discharge times before failure, this work aims to suppress the formation of two short-circuit pathways by optimizing the tube wall structure, the electrode materials and the electrode structure. A total of five improved GDT samples are designed by focusing on the insulation resistance change that occurs after the improvement; then, by combining these designs with the microscopic morphology changes inside the cavity and the differences in deposition composition, the reasons for the differences in the GDT failure risk are also analyzed. The experimental results show that compared with GDT of traditional structure and material, the method of adding grooves at both ends of the tube wall can effectively block the deposition pathway of the tube wall, and the cumulative discharge times before device failure are increased by 149%. On this basis, when the iron-nickel electrode is replaced with a tungsten-copper electrode, the difference in the electrode’s surface splash characteristics further extends the discharge times before failure by 183%. In addition, when compared with the traditional electrode structure, the method of adding an annular structure at the electrode edge to block the splashing pathway for the particles on the electrode surface shows no positive effect, and the cumulative discharge times before the failure of the two structures are reduced by 22.8% and 49.7% respectively. Among these improved structures, the samples with grooves at both ends of the tube wall and tungsten-copper as their electrode material have the lowest failure risk.

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Comparative study on breakdown characteristics of trigger gap and overvoltage gap in a gas pressurized closing switch

Cited by 10 publications

References 15 publications

An experimental and numerical study: to investigate the switching characteristics of a field-distortion sparkgap switch in various SF₆ admixtures

An experimental and numerical study: to investigate the switching characteristics of a field-distortion sparkgap switch in various SF₆ admixtures

Investigation on the electrode surface roughness effects on a repetitive self-breakdown gas switch

Reliability improvement of gas discharge tube by suppressing the formation of short-circuit pathways

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Comparative study on breakdown characteristics of trigger gap and overvoltage gap in a gas pressurized closing switch

Cited by 10 publications

References 15 publications

An experimental and numerical study: to investigate the switching characteristics of a field-distortion sparkgap switch in various SF6 admixtures

An experimental and numerical study: to investigate the switching characteristics of a field-distortion sparkgap switch in various SF6 admixtures

Investigation on the electrode surface roughness effects on a repetitive self-breakdown gas switch

Reliability improvement of gas discharge tube by suppressing the formation of short-circuit pathways

Contact Info

Product

Resources

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An experimental and numerical study: to investigate the switching characteristics of a field-distortion sparkgap switch in various SF₆ admixtures

An experimental and numerical study: to investigate the switching characteristics of a field-distortion sparkgap switch in various SF₆ admixtures