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1. WO1990013960 - AUTOMATICALLY RESETTING PROTECTION ARRANGEMENT FOR A TELEPHONE SUBSCRIBER LINE INTERFACE CIRCUIT

Publication Number WO/1990/013960
Publication Date 15.11.1990
International Application No. PCT/CA1990/000118
International Filing Date 11.04.1990
Chapter 2 Demand Filed 05.11.1990
IPC
H02H 9/04 2006.01
HELECTRICITY
02GENERATION, CONVERSION, OR DISTRIBUTION OF ELECTRIC POWER
HEMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
9Emergency protective circuit arrangements for limiting excess current or voltage without disconnection
04responsive to excess voltage
H04M 3/18 2006.01
HELECTRICITY
04ELECTRIC COMMUNICATION TECHNIQUE
MTELEPHONIC COMMUNICATION
3Automatic or semi-automatic exchanges
18with means for reducing interference; with means for reducing effects due to line faults
CPC
H02H 9/042
HELECTRICITY
02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
HEMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
9Emergency protective circuit arrangements for limiting excess current or voltage without disconnection
04responsive to excess voltage
042comprising means to limit the absorbed power or indicate damaged over-voltage protection device
H04M 3/18
HELECTRICITY
04ELECTRIC COMMUNICATION TECHNIQUE
MTELEPHONIC COMMUNICATION
3Automatic or semi-automatic exchanges
18with means for reducing interference ; or noise; with means for reducing effects due to line faults ; with means for protecting lines
Applicants
  • NORTHERN TELECOM LIMITED [CA]/[CA]
Inventors
  • MARKOVIC, Milan
  • SHTULMAN, Alexander
Agents
  • SMITH, Dallas, F.
Priority Data
344,38028.04.1989US
Publication Language English (EN)
Filing Language English (EN)
Designated States
Title
(EN) AUTOMATICALLY RESETTING PROTECTION ARRANGEMENT FOR A TELEPHONE SUBSCRIBER LINE INTERFACE CIRCUIT
(FR) AGENCEMENT DE PROTECTION AVEC REMISE A L'ETAT INITIAL AUTOMATIQUE POUR CIRCUIT D'INTERFACE DE LIGNES D'ABONNES (SLIC) D'UN RESEAU TELEPHONIQUE
Abstract
(EN)
A protection arrangement for coupling a two-wire line (10) to a SLIC includes surge protecting triacs (40) between each wire and ground, and normally closed contacts (18) coupling the wires to the SLIC. The triacs (40) are triggered via varistors (46) coupled to the wires on the SLIC side of the contacts, which are opened in response to over-voltages on the line, as detected via a diode bridge (20) and threshold circuit (24). The triacs (40) are thereby not triggered during over-voltage conditions so that their power dissipation is reduced during such faults, whereas they respond rapidly to surge conditions which accordingly need not be handled by the contacts (18).
(FR)
L'agencement de protection pour le couplage d'une ligne bifilaire (10) à un circuit d'interface de lignes d'abonnés (SLIC) comprend des triacs (40) de protection contre les ondes de choc, disposés entre chaque fil et le sol, ainsi que des contacts normalement fermés (18) de couplage des fils au SLIC. Les triacs (40) sont déclenchés par l'intermédiaire de varistances (46) couplées aux fils sur le côté SLIC des contacts qui s'ouvrent en réponse à des surtensions se produisant sur la ligne telles qu'elles sont détectées par une diode pont (20) et par un circuit de seuil (24). Les triacs ne sont par conséquent pas déclenchés pendant des conditions de surtension de sorte que leur dissipation de puissance est réduite pendant ces conditions, alors qu'ils répondent rapidement aux ondes de chocs qui n'ont respectivement pas besoin d'être gérées par les contacts (18).
Also published as
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