Communications: electrical – Condition responsive indicating system – Specific condition
Patent
1990-07-09
1991-04-16
Orsino, Joseph A.
Communications: electrical
Condition responsive indicating system
Specific condition
340691, 324133, 361 93, G08B 2100
Patent
active
050086510
ABSTRACT:
A fault indicator operable from an internal battery for indicating the occurrence of a fault current in a monitored electrical conductor of an AC power distribution system. Upon occurrence of a fault current a reed switch in magnetic communication with the monitored conductor momentarily closes to connect the internal battery to a capacitor, which is charged by the battery during the switch closure. The capacitor is connected to the display electrodes of a high impedance liquid crystal display, which displays an "F" to indicate fault occurrence. The fault indication may be reset either by the slow discharge of the capacitor, by discharging the capacitor through a second reed switch manually actuated by a magnetic reset tool from outside the fault indicator housing, or automatically upon restoration of power in the conductor.
REFERENCES:
patent: 3660757 (1972-05-01), Winslow
patent: 3667039 (1972-05-01), Garfein et al.
patent: 3906477 (1975-09-01), Schweitzer, Jr.
patent: 4139820 (1979-02-01), Rode
patent: 4152639 (1979-05-01), Chaffee
patent: 4152643 (1979-05-01), Schweitzer, Jr.
patent: 4259634 (1981-03-01), Okamoto et al.
patent: 4263550 (1981-04-01), Schweitzer, Jr.
patent: 4301407 (1981-11-01), Koslar
patent: 4438403 (1984-03-01), Schweitzer, Jr.
patent: 4458198 (1984-07-01), Schweitzer, Jr.
patent: 4495489 (1985-01-01), Schweitzer, Jr.
patent: 4503389 (1985-03-01), Singer
patent: 4550288 (1985-10-01), Schweitzer, Jr.
patent: 4559496 (1985-12-01), Harnden, Jr. et al.
patent: 4641220 (1987-02-01), Schweitzer, Jr.
patent: 4686518 (1987-08-01), Schweitzer, Jr.
patent: 4714916 (1987-12-01), Schweitzer, Jr.
patent: 4794329 (1988-12-01), Schweitzer, Jr.
patent: 4794332 (1988-12-01), Schweitzer, Jr.
patent: 4823078 (1989-04-01), Mohebban
patent: 4881028 (1989-11-01), Bright
"Liquid Crystal Display", publication of Hamlin Inc., Lane and Grove Streets, Lake Mills, Wisconsin, circa Jun. 1, 1989.
Hofsass Jeffery A.
Orsino Joseph A.
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