Recovery of gas density in a nitrogen gap after breakdown

Cai, Xinjing; Zou, Xiaobing; Wang, Xinxin; Wang, Liming; Guan, Zhicheng; Jiang, Weihua

doi:10.1063/1.3488016

Cited by 16 publications

(6 citation statements)

References 9 publications

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“…This study investigated the repetition performance of SF 6 -N 2 and SF 6 -air mixtures, exploring their potential as replacements for pure SF 6 in corona-stabilized switches with high PRFs. Additionally, the SF 6 -He mixture exhibits significant potential for high-PRF switches [8,22] as it combines the high dielectric strength of SF 6 with the superior thermal conductivity and molecular velocity of helium. This is expected to result in a faster insulation recovery rate.…”

Section: Gas Typementioning

confidence: 99%

“…At high frequencies, the breakdown voltage decreases as the degree of field inhomogeneity decreases, while at low frequencies, the breakdown voltage increases with a decrease in the degree of field inhomogeneity. When the insulation recovery time is 1 s (corresponding to the case of 1 Hz), it is generally considered that the insulation strength of the gap has almost fully recovered [14,22,23]. This indicates that improving the homogeneity of the electric field can improve the single breakdown voltage of the switch, but when the recovery time is short, increasing the uniformity of the field will reduce the working voltage, indicating that the insulation recovery performance of the switch in this situation deteriorates.…”

Section: Field Inhomogeneitymentioning

confidence: 99%

“…This indicates that for switches with a more homogeneous electric field distribution, most of their insulation recovers within a long interval of 5 ms to 1 s (corresponding to 2 kHz and 1 Hz respectively), resulting in a slow recovery rate. If the difference between the voltage curves is very small, it indicates that the insulation has barely recovered within the corresponding time interval [14,22,25]. There may be two reasons for this phenomenon: (1) the insulation strength of the switch has almost fully recovered before this time interval; (2) there is a mechanism that prevents the continuous restoration of insulation capability during this interval.…”

Section: Field Inhomogeneitymentioning

confidence: 99%

“…Sci. 2023, 13, x FOR PEER REVIEW 8 of 23 barely recovered within the corresponding time interval [14,22,25]. There may be two reasons for this phenomenon: (1) the insulation strength of the switch has almost fully recovered before this time interval; (2) there is a mechanism that prevents the continuous restoration of insulation capability during this interval.…”

Section: Field Inhomogeneitymentioning

confidence: 99%

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Factors and Underlying Mechanisms That Influence the Repetitive Breakdown Characteristics of Corona-Stabilized Switches

Li,

Wang,

et al. 2023

Applied Sciences

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The corona-stabilized switch has the potential to be a high repetition rate pulsed-power switching device, but there has been limited investigation into its repetitive breakdown stability and insulation recovery characteristics. Repetitive breakdowns of gas are characterized by a memory effect, where the subsequent breakdown process is inevitably influenced by the preceding one. However, there are still some issues that require further exploration in the current research on the mechanism of memory effect on repetitive breakdown characteristics. To clarify the factors and mechanisms that affect the repetitive breakdowns of corona-stabilized switches, this paper introduced optical observation methods into the experimental investigation. Through optical–electrical coupled diagnosis, the repetitive breakdown stability and insulation recovery performance of corona-stabilized switches under different working conditions and repetition frequencies were analyzed. The monotonic promoting effect of corona stabilization on switch insulation strength recovery is proposed as well as the non-monotonic and complex regulatory mechanism of corona stabilization on repetitive breakdown stability. The research results provide a theoretical and practical basis for clarifying the mechanism of repetitive corona-stabilized breakdowns and optimizing the design of corona-stabilized switches.

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Section: Gas Typementioning

confidence: 99%

Section: Field Inhomogeneitymentioning

confidence: 99%

Section: Field Inhomogeneitymentioning

confidence: 99%

Section: Field Inhomogeneitymentioning

confidence: 99%

See 2 more Smart Citations

Factors and Underlying Mechanisms That Influence the Repetitive Breakdown Characteristics of Corona-Stabilized Switches

Li,

Wang,

et al. 2023

Applied Sciences

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“…The type, working principle, spatial distribution and decay time of the dominant factor significantly affect the memory effect. For instance, the memory effect of metastable species and free electrons in N 2 or air always monotonically promote the subsequent breakdown [43], [47]- [49], while the memory effect of residual conductivity and positive ions may inhibit the subsequent breakdown [40]- [44]. However, the investigations on dominant factor and its working principle of memory effect of SF 6 repetitive breakdown in highly inhomogeneous fields are still insufficient.…”

Section: Introductionmentioning

confidence: 99%

The Influence of Electric Field Inhomogeneity on Repetitive Performance of a Corona-Stabilized Switch

Huang

Yang

2020

IEEE Access

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The corona-stabilized switch has a great potential in pulsed power systems where high pulse repetition frequencies are required. Corona discharge in SF 6 in highly inhomogeneous electric field is utilized to improve repetitive performance of this kind of switch. To clarify how the repetitive performance (insulation recovery and repetitive breakdown stability) of the switch depends on the field inhomogeneity, the insulation recovery and repetitive breakdown stability of a corona-stabilized switch are experimentally investigated and theoretically analyzed. An innovative double-pulse method combining breakdown voltage and discharge channel images is used to measure the insulation recovery of the switch. For different electrodes, their voltage jitters at pulse repetition frequencies of 1-2000 Hz are measured to illustrate the stability of repetitive breakdown. The experimental results are theoretically analyzed from the memory effect and behavior characteristics of the residual plasma, the critical volume and its dynamic characteristics. The results reveal the corona stabilization enhancement effect during the repetitive breakdown in SF 6 in extremely inhomogeneous field. The influence of electrode profile on the propagation of discharge channel shock wave, the decay of residual plasma and the recovery of neutral gas density are clarified. Effect of the electrostatic conditions, including the critical volume and its dynamic characteristics, and the intensity of corona discharge, on the repetitive performance of the switch are also clarified. INDEX TERMS Corona stabilization, electric field inhomogeneity, gas discharge devices, insulation recovery, memory effect.

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Experimental investigations of argon spark gap recovery times by developing a high voltage double pulse generator

Reddy

Patel

Naresh

et al. 2014

Review of Scientific Instruments

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The voltage recovery in a spark gap for repetitive switching has been a long research interest. A two-pulse technique is used to determine the voltage recovery times of gas spark gap switch with argon gas. First pulse is applied to the spark gap to over-volt the gap and initiate the breakdown and second pulse is used to determine the recovery voltage of the gap. A pulse transformer based double pulse generator capable of generating 40 kV peak pulses with rise time of 300 ns and 1.5 μs FWHM and with a delay of 10 μs-1 s was developed. A matrix transformer topology is used to get fast rise times by reducing L(l)C(d) product in the circuit. Recovery Experiments have been conducted for 2 mm, 3 mm, and 4 mm gap length with 0-2 bars pressure for argon gas. Electrodes of a sparkgap chamber are of rogowsky profile type, made up of stainless steel material, and thickness of 15 mm are used in the recovery study. The variation in the distance and pressure effects the recovery rate of the spark gap. An intermediate plateu is observed in the spark gap recovery curves. Recovery time decreases with increase in pressure and shorter gaps in length are recovering faster than longer gaps.

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Recovery of gas density in a nitrogen gap after breakdown

Cited by 16 publications

References 9 publications

Factors and Underlying Mechanisms That Influence the Repetitive Breakdown Characteristics of Corona-Stabilized Switches

Factors and Underlying Mechanisms That Influence the Repetitive Breakdown Characteristics of Corona-Stabilized Switches

The Influence of Electric Field Inhomogeneity on Repetitive Performance of a Corona-Stabilized Switch

Experimental investigations of argon spark gap recovery times by developing a high voltage double pulse generator

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