Current interrupter for fault current limiter and method

Details Current interrupter for fault current limiter and method Current interrupter for fault current limiter and method

1978-03-22

1981-02-10

Scott, James R.

Electricity: circuit makers and breakers

Liquid contact

Time delay

200144AP, 200149A, 200150B, 200150D, H01H 3368

Patent

active

042503655

ABSTRACT:
A current interrupter is provided for use in controlling currents associated with power line faults. The interrupter is of the type having a housing filled with a dielectric fluid such as pressurized sulfur hexafluoride liquid and having electrodes extending through the walls of the housing. Associated with the electrodes is a movable contact member which when closed provides a path for current flow and which is movable to break a circuit. The housing includes a fluid chamber having a passage for fluid communication with the remaining interior of the housing. The movable contact member closes the passage when in its closed position. The method of the invention includes rapidly increasing the pressure in the chamber to move the contact from its closed position. A chemical propellant drives a piston against the fluid in the chamber. The fluid drives the movable contact member to open the passage and to break the current path, causing an arc. The fluid escaping from the chamber flows transverse to the arc thereby increasing the voltage drop of the interrupter.

REFERENCES:
patent: 2049328 (1936-07-01), Skeats
patent: 3129307 (1964-04-01), DeVargas
patent: 3264438 (1966-08-01), Gay
patent: 3590191 (1971-06-01), Kind et al.
patent: 3704391 (1972-11-01), McConnell
patent: 3728505 (1973-04-01), McConnell
patent: 3902031 (1975-08-01), McConnell
patent: 3909676 (1975-09-01), McConnell
patent: 3927350 (1975-12-01), McConnell
patent: 4034175 (1977-07-01), Gratzmuller
Fuji Electric Co. Ltd., Fuji Publication EEC 65, "Fuji Indoor Use Ultrap Fuse", pp. 1-6.

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