Best choice of insulation gas medium for MMGS in fast linear transformer driver

Gas spark closing switch is one of the most important components for a fast linear transformer driver (FLTD). In this paper, we describe the investigation of insulation gas media for a multi-gap multi-channel gas spark closing switch. A six-gap gas switch with corona needles was tested in a typical...

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Bibliographic Details
Published inAIP advances Vol. 10; no. 3; pp. 035111 - 035111-5
Main Authors Liu, Xuandong, Liu, Xianfei
Format Journal Article
LanguageEnglish
Published Melville American Institute of Physics 01.03.2020
AIP Publishing LLC
Subjects
Breakdown
Current distribution
Delay time
Gas mixtures
Insulation
Low voltage
Needles
Transformers
Vibration
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Summary:Gas spark closing switch is one of the most important components for a fast linear transformer driver (FLTD). In this paper, we describe the investigation of insulation gas media for a multi-gap multi-channel gas spark closing switch. A six-gap gas switch with corona needles was tested in a typical FLTD brick with two capacitors of 40 nF and a load resistor of about 10 Ω. Corona discharge current, self-breakdown voltage distribution, and triggered breakdown performance were tested when the gas switch was filled with air, N2, CO2, SF6/N2, and C4F7N/N2. When C4F7N/N2 was applied, there was no abnormal breakdown with low voltage found in the whole test process; the trigger breakdown delay time and switch jitter were very stable, and no pre-fire was found during about 2000 triggered shots. Therefore, we think the C4F7N/N2 gas mixture with a very little amount of C4F7N can dramatically improve the switch performance. It is valuable and easy to realize the application of C4F7N/N2 mixture in large scale pulsed power facilities.
ISSN:2158-3226
2158-3226
DOI:10.1063/1.5136275