Compression of data in protection and control communications...

H - Electricity – 02 – H

Patent

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H02H 3/00 (2006.01) H02H 7/00 (2006.01) H04B 1/66 (2006.01) H02H 7/26 (2006.01)

Patent

CA 2451815

The data compression system is used for communication between at least two protective relays on a power transmission line. The system is responsive to a linear digital output from an analog to digital converter (20) to which is applied successive analog quantities. At the transmitting protective relay, a logarithmic compression element (28) reduces the number of digital bits to be transmitted while maintaining any errors in the encoding/decoding process to a level acceptable for the existing protection scheme for the power system. The compressed data is transmitted over a communication line to the receiving relay, where it is decoded (expanded) (48) and then used in the relay's protection algoritm (50).

Le système de compression de données de l'invention est utilisé pour établir une communication entre au moins deux relais de protection par une ligne de transmission d'énergie. Le système réagit à une sortie numérique linéaire d'un convertisseur analogique-numérique (20) auquel est transmis des quantités analogiques successives. Au niveau du relais de protection d'émission, un élément de compression logarithmique (28) réduit le nombre de bits numériques tout en maintenant d'éventuelles erreurs dans le processus de codage-décodage à un niveau acceptable pour le plan de protection existant pour le réseau électrique. Les données comprimées sont transmises, par ligne de communication, au relais de réception où elles sont décodées (décomprimées) (48) puis utilisées dans l'algorithme de protection du relais (50).

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