Protection arrangements for communications lines

Details Protection arrangements for communications lines Protection arrangements for communications lines

1986-09-12

1991-02-05

Pellinen, A. D.

Electricity: electrical systems and devices

Safety and protection of systems and devices

Load shunting by fault responsive means

361111, 361119, 379399, 379412, H02H 900

Patent

active

049910515

ABSTRACT:
A protection arrangement for a two-wire line, such as a telephone subscriber 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.

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patent: 4440980 (1984-04-01), Bakker
patent: 4679115 (1987-07-01), Conan
patent: 4695916 (1987-09-01), Satoh et al.

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