Estimation of low probability pre-fire of multi-gap gas switch for linear transformer driver

Zhang Yushu; Jiang Xiaofeng; Wen Zhenming; Sun Fengju; Liu Yanbo; Jiang Hongyu; Qiu Aici

doi:10.11884/HPLPB202436.240005

Volume 36 Issue 11

Nov. 2024

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Zhang Yushu, Jiang Xiaofeng, Wen Zhenming, et al. Estimation of low probability pre-fire of multi-gap gas switch for linear transformer driver[J]. High Power Laser and Particle Beams, 2024, 36: 115016. doi: 10.11884/HPLPB202436.240005

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Zhang Yushu, Jiang Xiaofeng, Wen Zhenming, et al. Estimation of low probability pre-fire of multi-gap gas switch for linear transformer driver[J]. High Power Laser and Particle Beams, 2024, 36: 115016. doi: 10.11884/HPLPB202436.240005

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Estimation of low probability pre-fire of multi-gap gas switch for linear transformer driver

doi: 10.11884/HPLPB202436.240005

1.
State Key Laboratory of Electrical Insulation and Power Equipment, Xi’an Jiaotong University, Xi’an 710049, China
2.
National Key Laboratory of Intense Pulsed Radiation Simulation and Effect, Northwest Institute of Nuclear Technology, Xi’an 710024, China

Received Date: 2024-03-04
Accepted Date: 2024-08-25
Rev Recd Date: 2024-08-25

Available Online: 2024-08-31

Publish Date: 2024-11-01

Abstract

Abstract

The pre-fire of gas switches is the unexpected breakdown at triggered mode, which is the main factor restricting the development and engineering application of linear transformer driver (LTD). In this paper, the dispersion of breakdown voltage as well as pre-fire rate of multi-gap gas switches under typical working pressures of LTD was investigated and reported. A simplified gas switch was designed to measure self-breakdown voltage at higher gas pressures, and the cumulative distribution function of self-breakdown voltage considering uneven gap voltage distribution was derived. The self-breakdown voltage distribution characteristics of multi-gap switches under LTD working pressure were calculated and experimentally verified. The estimated pre-fire rate was obtained by using peak-over-threshold method to fit the Weibull distribution of small probability pre-fire events under low working coefficients. The measured pre-fire rate was obtained by a 10 000 triggering test. The results show that the dispersion of the self-breakdown voltage of the switch increased with air pressure. Measuring the self-breakdown voltage at low air pressure can not extrapolate the pre-fire rate at high pressure under actual working conditions. When the working coefficients of the gas switch were 65% and 60%, the estimated pre-fire rates were $1.44 \times {10^{ - 4}}$ and $3.01 \times {10^{ - 5}}$, which were close to the experimental results of the 10 000 triggering test, verifying the feasibility of the estimation method.
- gas switch,
- linear transformer driver,
- pre-fire rate,
- Weibull distribution

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References(22)

References

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