NDLI: Operation of a triggered vacuum flashover switch on pawn

Content Provider	IEEE Xplore Digital Library
Author	Kellogg, J.C. Boller, J.R. Commisso, R.J. Ford, R.D. Jenkins, D.J. Lupton, W.H. Shipman, J.D.
Copyright Year	1989
Description	Author affiliation: Naval Research Laboratory (Kellogg, J.C.)
Abstract	Pawn is a prototype inductive storage pulsed power generator with two switching stages. The first stage is a wire fuse array driven by a low voltage (/spl ap/40 kV) capacitor bank, and the second stage is a fast opening vacuum switch such as a plasma erosion opening switch. A triggered vacuum flashover switch isolates the fuse stage from the second stage during fuse conduction. The switch consists of an insulating ring sandwiched between electrodes. Ultraviolet light and plasma from small spark discharges initiate a flashover of the insulator surface to close the switch. The trigger command is sent by fiber optic link. The switch can be command triggered after holding off voltages for /spl ap/15 /spl mu/s; peak holdoff voltage is /spl ap/85 kV. The time to closure decreases from 240 ns at a closing voltage of 15 kV to 140 ns at 50 kv with a typical jitter of /spl plusmn/50 ns. Typical fuse stage output current is /spl ap/1 MA with an average risetime of 1/spl mu/s. Current density in the switch is approximately 25 kA/cm/sup 2/. The risetime of this current pulse can be varied by a factor of two by triggering the switch at different times (closing voltages). Switch design, operation, timing jitter characteristics and multiple shot use will be discussed.
Starting Page	710
Ending Page	712
File Size	283790
Page Count	3
File Format	PDF
DOI	10.1109/PPC.1989.767585
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	1989-06-11
Publisher Place	USA
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Flashover Fuses Voltage Plasmas Optical switches Inductance Capacitors Electrodes Sparks Power transformer insulation
Content Type	Text
Resource Type	Article

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4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
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