Supply of electricity branching change manner and switching arrangement null of submarine cable

摘要

PURPOSE:To secure communication in all sections except for a faulty section by connecting a transmission path on one side of the arbitrary transmission path of a main transmission path to a branch transmission path based on the direction of a current that flows on a power supplying path, grounding the path on the other side, and switching the path. CONSTITUTION:It is assumed that a fault is generated between the local station B of the main transmission path and the contact b1 of the power supplying path 4b. The power supply of the main transmission path is stopped once simultaneously with the generation of the fault, and following that, transient conduction is performed so that the current can flow from a local station C to a submarine ground line 6 via the power supplying path 4'c of a non-relay transmission path. Thereby, the current flows from the station C to an electric galvanometer 9a a diode 11a a submarine ground line 6', and not to an electric galvanometer 9b. As a result, the current flows on only the electric galvanometer 9a, and a switch unit 10a is switched, and a contact a1 is switched from a contact a2 to a contact a3, and a contact a4 from a contact a5 to a contact a6, and such state is maintained until the current in a backward direction flows on the electric galvanometer 9a, and the power supplying path 4a is connected to the ground line 6, and the path 4'c to the path 4b. By supplying power from a local station A to the line 6, the communication between the stations A and C can be secured.