Staged opening switch

Details Staged opening switch Staged opening switch

1987-09-01

1989-08-22

Macon, Robert S.

Electricity: circuit makers and breakers

Liquid contact

Time delay

200144R, 361 23, 307149, 307132R, 307115, 307113, H01H 3304, H01H 4700, H02H 504

Patent

active

048598194

ABSTRACT:
A staged switch for conducting a large electrical current for an indefinite time period and then rapidly switching the current into a load circuit. The switch comprises a first stage which can conduct a large electrical current for an indefinite time period without damage to the stage and a second stage which is a fast-opening element. The first stage includes primary and secondary contacts wherein the primary contacts conduct a charging current and the secondary contacts divert the current into the fast-opening second stage. The secondary contacts "make" before the primary contacts "break", reducing the damage to the contacts which might otherwise be experienced. The second stage is a low-inductance element which reduces the level of energy absorbed by the first-stage contacts, minimizing damage to the contacts. The second-stage element may be constructed in a cartridge and may be loaded into the switch using an autoloader device.

REFERENCES:
High Speed Foil Breakers, by Andrezen, 1976.
A Method for Enhancing Exploding Aluminum Foil Fuses for Inductive Storage Switching, by Conte, Friedman and Ury, Nov. 1976.
Pulse Power Systems Employing Inductive Energy Storage, by Trost et al., Nov. 1976.
Explosively Actuated 100 kA Opening Switch for High Voltage Applications, by Ford and Vitkovitsky, Jul. 1977.
Two Stage Opening Switch Techniques for Generation of High Inductive Voltages, by Conte et al., Oct. 1977.
Inductive Charging of Pulse Lines in 0.1 to 1.0 MJ Range Using Foil Fuses Staged with Explosively Actuated Switches, by Conte et al., Mar. 1978.

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