Reception of digitally coded protection signals in a remote tripping device
AssigneeABB Schweiz AG
InventorHermann Schnyder
Life of this patent
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Abstract
In a remote tripping device and in a method for reception of digitally coded protection signals in a remote tripping device, a sequence of digital code words is received on a transmission channel, and a protection signal is regarded as having been received when a code which corresponds to this protection signal has been detected in this sequence a total of n times within a time window of predetermined length, wherein the number n is determined on the basis of an estimate of a measure at any given time of a disturbance on the transmission channel.
Claims7
A method for reception of digitally coded protection signals in a remote tripping device for distance protection in electrical systems, in which a sequence of digital code words is received on a transmission channel, and a protection signal is regarded as having been received when a code which corresponds to this protection signal has been detected in this sequence a total of n times within a time window of predetermined length, characterized
- in that the number n is determined on the basis of an estimate of a measure at any given time of a disturbance on the transmission channel.
A remote tripping device for distance protection in electrical systems, having a means (2) for reception of a sequence of digital code words on a transmission channel, at least one detector (3, 5, 7) for detection of a code which corresponds to a protection signal, and at least one means for signaling that a protection signal is regarded as having been received if a code which corresponds to the protection signal is detected a total of n times in this sequence within a time window of predetermined length, characterized
- in that the number n can be determined on the basis of an estimate of a measure at any given time of a disturbance on the transmission channel.
Dependencies are inferred from the claim text.