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US 4,063,300 AGranted
Protective relay arrangements
AssigneeGeneral Electric Company
InventorsEric Paddison, Leonardo Perez-Cavero, Christopher George Wilson
Life of this patent
Estimating the term…
Abstract
A protective relay arrangement for an A.C. power system wherein the occurrence of a fault is detected by monitoring the phase or amplitude relation between at least one pair of signals which, when a fault occurs in the system, are functions of a current and/or voltage which would have occurred in the power system if the or each emf source in the system had a value equal to the pre-fault voltage at the point in the system where the fault has occurred.
Claims18
A protective relay arrangement for an A.C. power system comprising:
- circuit means for deriving at least one pair of signals which, when a fault occurs in the system, are functions of quantities which would have occurred in the system at the relaying point under fault conditions if the or each emf source in the system had a value equal to the pre-fault voltage at the point in the system where the fault has occurred;
- and comparator means for comparing said signals.
Dependencies are inferred from the claim text.