Communications: electrical – Digital comparator systems
Patent
1978-02-17
1980-06-03
Shaw, Gareth D.
Communications: electrical
Digital comparator systems
307 38, 307139, 361 66, H04Q 900
Patent
active
042064430
ABSTRACT:
A protective load disconnect unit is remotely controlled at a single control input terminal from a master controller and monitoring unit. A power switching circuit is actuated to switch a load to be controlled from on to off by a control signal from the master unit. The input terminal is maintained electrically isolated from the switching circuit. A load status response circuit senses the on-off conditions of the power switching circuit. A variable impedance circuit included in the load status response circuit is isolated from the power switching circuit and is connected to the input terminal. The on and off conditions of the power switching circuit changes the variable impedance circuit so that an electrical condition at the input terminal is varied to indicate the load status while the control signal concurrently actuates the switching circuit.
REFERENCES:
patent: 3906242 (1975-09-01), Stevenson
patent: 3916183 (1975-10-01), Duve
patent: 3964023 (1976-06-01), Fauchez
patent: 4021615 (1977-05-01), James
patent: 4106013 (1978-08-01), Cronin
Miller Joel
Shaw Gareth D.
Smith R. W.
Westinghouse Electric Corp.
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