Protection and recovery of telephone line interface circuits

H - Electricity – 02 – H

Patent

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Details

H02H 3/247 (2006.01) H04M 1/74 (2006.01) H04M 3/00 (2006.01) H04M 3/18 (2006.01)

Patent

CA 2102837

An automatic protection and recovery method for a telephone line interface circuit is described. The interface circuit monitors current on the line, and in the event of a fault producing an excessive current a protection relay interrupts a connection of the interface circuit to the line, and the interface circuit monitors common mode voltage on the line. The interface circuit is reconnected in response to the monitored voltage being below a relatively high threshold. If a second interruption results, the interface circuit is then reconnected in response to the monitored voltage being below a lower threshold. If a further interruption results, the interface circuit enters a ground fault recovery process. The method facilitates protection and rapid recovery from arbitrary fault conditions on the telephone line.

L'invention est une méthode automatique de protection et de retour à la normale pour circuits d'interface de ligne téléphonique. Le circuit d'interface surveille le courant sur la ligne et, en cas de défaillance produisant une surintensité, un relais de protection déconnecte le circuit d'interface de la ligne et celui-ci surveille la tension en mode commun sur cette dernière. Le circuit d'interface est reconnecté quand la tension surveillée retombe sous un seuil relativement élevé. S'il y a une seconde déconnexion, le circuit d'interface est reconnecté quand la tension surveillée retombe sous un seuil plus bas que le premier. S'il y a une autre déconnexion, le circuit d'interface est soumis à un processus de retour à la normale après une fuite à la terre. La méthode de l'invention simplifie les opérations de protection et de retour à la normale en cas de défaillance quelconque de la ligne téléphonique.

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