Submarine telecommunications systems

Details Submarine telecommunications systems Submarine telecommunications systems

1991-12-12

1993-03-23

Pellinen, A. D.

Electricity: electrical systems and devices

Control circuits for electromagnetic devices

For relays or solenoids

361170, 307 38, 307130, 333105, H01H 4722, H04B 300

Patent

active

051969840

ABSTRACT:
A branching unit for use in a submarine telecommunications cable system which employs electrical power feeding for repeaters/regenerators and in particular a system employing multiple branching units. The unit terminates three line cables (at 1, 2, 3) and a sea earth (at 4) and includes three high voltage element relays (A, A1; B, B1; C, C1) only one of which is energized at a time. When electrical power is supplied between any two line cables the third is isolated and connected to the sea earth. Short circuit or open circuit faults in one line cable may be isolated and connected to the sea earth, whilst allowing powering of the remaining fault free two line cables. The unit is polarity insensitive and symmetrical, cathodic protection being provided on all three lines (FIG. 1).

REFERENCES:
patent: 3462653 (1969-08-01), Koeman et al.
patent: 3644787 (1972-02-01), Hamilton
patent: 3889131 (1975-06-01), Speller
patent: 4138627 (1979-02-01), Camic
patent: 4247787 (1981-01-01), Page
patent: 4521822 (1985-06-01), Simard
patent: 4798969 (1989-01-01), Inoue et al.
Kogure, Yoshichi; Patent Abstracts of Japan; ABS Group E842; vol. 13, No. 493; 01-198123; Feeding Current Switching Circuit.

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