Electricity: electrical systems and devices – Control circuits for electromagnetic devices – For relays or solenoids
Patent
1979-07-18
1980-11-18
Miller, J. D.
Electricity: electrical systems and devices
Control circuits for electromagnetic devices
For relays or solenoids
361182, 361195, 361106, 307 39, H01H 4726
Patent
active
042349044
ABSTRACT:
A process for the protection of electrical systems upon return of power after power interruptions, through the immediate disconnection of secondary consuming units by an audio-frequency control receiver, and the subsequent reconnection thereof in timed sequence. The audio-frequency control receivers have, in addition to a normal control path, a second path, through which, upon return of the voltage, the switch relay for secondary consuming units is disconnected upon reaching 2/3 of the system voltage. The process may be implemented through the use of a two-state D.C. relay, which is controlled by a secondary path including a cold lead to the system voltage. The process may alternatively be implemented through the use of a two-state A.C. relay which is controlled through a half-wave secondary path including a capacitor/resistor parallel circuit.
REFERENCES:
patent: 2739270 (1956-03-01), Edwards et al.
patent: 3359551 (1967-12-01), Dennison
patent: 3486080 (1969-12-01), Tillmann
patent: 3702418 (1972-11-01), Obenhaus
patent: 3770977 (1973-11-01), McIntosh
LGZ Landis & Gyr Zug AG
Miller J. D.
Schroeder L. C.
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