Submarine telecommunications systems
US5196984A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Dec 12, 1991 |
| Grant date | Mar 23, 1993 |
| Priority date | — |
| Expiry date | Dec 12, 2011 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04B3/44
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
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).
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.