PROTECTION ARRANGEMENTS FOR COMMUNICATIONS LINES

PROTECTION ARRANGEMENTS FOR COMMUNICATIONS LINES

A protection arrangement for a two-wire line, such as a telephone sunscriber line, includes a transformer having two primary windings and a secondary winding. The primary windings are connected in series with the wires of the line with phases such that common mode (longitudinal) currents on the line...

Ausführliche Beschreibung

Gespeichert in:
Bibliographische Detailangaben
1. Verfasser: HUNG, FRANCIS YUN-TAI
Format: Patent
Sprache:eng
Schlagworte:
CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
ELECTRIC COMMUNICATION TECHNIQUE
ELECTRICITY
EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
GENERATION
TELEPHONIC COMMUNICATION
TRANSMISSION
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Beschreibung
Zusammenfassung:A protection arrangement for a two-wire line, such as a telephone sunscriber line, includes a transformer having two primary windings and a secondary winding. The primary windings are connected in series with the wires of the line with phases such that common mode (longitudinal) currents on the line induce a current in the secondary winding, whereas loop currents do not. The induced current in the secondary winding is amplified and used to trigger a protection device, such as a triac or SCR and diode bridge arrangement, to short circuit the line for the duration of any excessive current thereon.