Analysis and Enhancing of Self-Breakdown Voltages of a Multistage Gas Switch

Cong, Peitian; Sun, Tao; Qiu, Aici; Zhengzhong, Zeng

doi:10.1109/tps.2012.2227125

Cited by 16 publications

(6 citation statements)

References 14 publications

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“…The electrodes are made of stainless steel. This two-gap gas switch has the similar gap structure and electric field distribution with a sixgap gas switch developed by us [11].…”

Section: Methodsmentioning

confidence: 63%

“…The multi-gap gas switches, which have the advantages of low trigger threshold and high breakdown stability, are widely used in FLTD-based drivers at present. As a result, many investigations have been already conducted on some typical multi-gap gas switches, and the influences of trigger voltage, working coefficient, air pressure, electrode structure and UV pre-ionization on the trigger characteristics have also been obtained [8][9][10][11][12][13][14][15][16]. However, most of the researches are focused on the performance of the whole switch, the studies on the breakdown characteristics of each gap and their influence on the whole switch are relatively few.…”

Section: Introductionmentioning

confidence: 99%

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

Zhai

Huang

Cong

et al. 2018

Plasma Sci. Technol.

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Gas pressurized closing switches are one of the most important elements in FLTD-based systems. Improving the trigger performance of gas switches is useful for optimizing the output parameters and the reliability of the FLTD. In this paper, the breakdown characteristics of the trigger gap and the overvoltage gap are studied experimentally. The reasons for the different breakdown performance of the two gaps are also investigated. The results show that the breakdown delay of the trigger gap is more influenced by the trigger voltage, while the breakdown delay of the overvoltage gap is more influenced by the working coefficient and always higher than that of the trigger gap. The jitter of the trigger gap is more influenced by the trigger voltage and accounts more than 60% of the total switch jitter, while the jitter of the overvoltage gap is hardly changed with the trigger voltage as well as the working coefficient and maintains less than 1.4 ns. It is proved that the discharging product from the trigger gap can effectively reduce the breakdown delay and jitter of the overvoltage gap. Based on that, the effect and improvement of pre-ionization on the two gaps are also studied. It is concluded that the jitter of the trigger gap reduces obviously when the pre-ionization is added, while the pre-ionization almost has no effect on the jitter of the overvoltage gap. The jitter of the overvoltage gap is about two times higher than the trigger gap in the pre-ionizing switch.

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“…The electrodes are made of stainless steel. This two-gap gas switch has the similar gap structure and electric field distribution with a sixgap gas switch developed by us [11].…”

Section: Methodsmentioning

confidence: 63%

Section: Introductionmentioning

confidence: 99%

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

Zhai

Huang

Cong

et al. 2018

Plasma Sci. Technol.

Self Cite

View full text Add to dashboard Cite

show abstract

“…During the tests the discharge chamber was filled with dry air at an absolute pressure between 0.1 and 0.4 MPa, the working coefficient was from 50% to 75% and the gap distance was set to 5 mm. These parameters are typical under the working conditions of LTD gas switches [3,4]. Before the formal experiment was performed, a self-breakdown experiment was done to determine the self-breakdown voltage U b of the gap which allowed the working coefficient k to be estimated as Figure 5 shows that by increasing k, the peak of the current waveform increases.…”

Section: Methodsmentioning

confidence: 99%

“…The linear transformer driver (LTD) is a modern technique implemented in pulsed power facilities, which can produce high-voltage, high-current, 100 ns rise time output pulse without any supplementary pulse-compression being required [1,2]. However, an LTD-based system for inertial fusion research, flash x-ray radiography or other Z-pinch applications may require as many as 50 000 gas pressurized closing switches [3,4]. These air-insulated switches are usually firstly DC-charged to a voltage lower than the breakdown voltage and then triggered by an external trigger pulse.…”

Section: Introductionmentioning

confidence: 99%

Experimental investigation on the development characteristics of initial electrons in a gas pressurized closing switch under DC voltage

Zhai¹,

Qiu²,

Luo³

et al. 2018

Plasma Sci. Technol.

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As one of the most important elements in linear transformer driver (LTD) based systems, the gas pressurized closing switches are required to operate with a very low prefire probability during the DC-charging process to ensure reliable operation and stable output of the whole pulsed power system. The most direct and effective way to control the prefire probability is to select a suitable working coefficient. The study of the development characteristics of the initially generated electrons is useful for optimizing the working coefficient and improving the prefire characteristic of the switches. In this paper an ultraviolet pulsed laser is used to generate initial electrons inside the gap volume. A current measuring system is used to measure the time-dependent current generated by the growth of the initial electrons so as to study the development characteristics of the electrons under different working coefficients. Experimental results show that the development characteristics of the initial electrons are influenced obviously by the working coefficient. With the increase of the working coefficient, the development degree of the electrons increases consequently. At the same times, there is a threshold of working coefficient which produces the effect of ionization on electrons. The range of the threshold has a slow growth but remains close to 65% with the gas pressure increase. When the working coefficient increases further, γ processes are starting to be generated inside the gap volume. In addition, an optimal working coefficient beneficial for improving the prefire characteristic is indicated and further tested.

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“…Later in the 1990's and the first decade of this century, further creative developments, various research work and applications of the 0.1 to 1 s wave-front LTD have been accomplished by laboratories and institutes around the world [7][8][9][10][11][12][13]. In some LTD's, a long (5 m) bushing-like flexible insulator was employed for the secondary-turn conductor which sustained a s-time-scale impulse up to a field of above 1 MV/cm.…”

Section: Introductionmentioning

confidence: 99%

Effects of gaseous defects on glycerin-impregnated multi-layer film insulation under impulse of 160-nanosecond wave-front

Zeng

Zheng

2015

IEEE Trans. Dielect. Electr. Insul.

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The breakdown behavior of high-purity-glycerin impregnated multi-layer polypropylene (PP) film insulation, with the existence of individually distributed visible tiny gaseous defects (defects due to gaseous inclusions) between the film layers, was investigated experimentally under high voltage impulse of 160-ns wave-front. The experimental results show that, for 100% winding coverage factor, the sample insulation of 10-layer PP film survived after 20 impulses of interval of several minutes at an electric field of 275 kV/mm. The breakdown field tends to decrease fast and linearly from about 500 kV/mm for 1-layer film, which is very close to the intrinsic breakdown field of the PP film, to about 330 kV/mm for 4 film layers. This tendency of falling of breakdown field becomes mild and then nearly staying as the number of film layers (n) increases from 4 to 10, indicating a flat decay law of n to the (-0.05-th) power. Furthermore, for 50%-90% covering factors, the average breakdown field is 254 kV/mm with 1-sigma deviation of 51 kV/mm when n ranges from 5 to 8, slightly decaying versus the reduction of covering factor by about 10%. The lowest breakdown field is 173 kV/mm in all cases for about 30 samples. The experimental data demonstrate that if visible tiny gaseous defects do not gather together into a long channel between film layers, no flashover will occur along film layer surface at a field of 15 kV/cm, otherwise flashover is inevitably initiated along the film-glycerin interface.

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Analysis and Enhancing of Self-Breakdown Voltages of a Multistage Gas Switch

Cited by 16 publications

References 14 publications

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

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

Experimental investigation on the development characteristics of initial electrons in a gas pressurized closing switch under DC voltage

Effects of gaseous defects on glycerin-impregnated multi-layer film insulation under impulse of 160-nanosecond wave-front

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