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AssigneeLGZ Landis & Gyr Zug AG
InventorKjell T. Fahlesson
Estimating the term…
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.
A process for the protection of electrical energy supply systems by means of audio-frequency signals upon the return of voltage after interruptions of the voltage, wherein the consuming units with secondary priorities upon return of the system voltage, are cut off automatically at a threshold which is a maximum of 2/3 of the system voltage through the audio-frequency control receiver, and that these consuming units are reconnected in a time sequence order after assured reconstruction of the energy supply by audio-frequency control signals.
Apparatus for protecting electrical energy supply systems wherein supply to secondary loads is normally controlled by means of audio-frequency signals, said apparatus comprising
Dependencies are inferred from the claim text.