PROCEDE ET INSTALLATION POUR ALIMENTER UN CABLE ELECTRIQUE AVEC UNE TENSION CONTINUE A LAQUELLE EST SUPERPOSEE UNE TENSION ALTERNATIVE

L'INVENTION SE RAPPORTE AU TRANSPORT DE L'ENERGIE ELECTRIQUE.LA TENSION ALTERNATIVE EST ENGENDREE DANS L'UNE DES STATIONS TERMINALES 4 ET COMPENSEE A L'AUTRE STATION TERMINALE 5 DE MANIERE A RENDRE NULLE LA SOMME DES FORCES ELECTROMOTRICES ALTERNATIVES DANS LA MAILLE QUI COMPREND LE CABLE 1. LA SOURCE DE TENSION ALTERNATIVE ET LE DISPOSITIF COMPENSATEUR SONT REALISES EN AGISSANT SUR LES IMPULSIONS DE COMMANDE DES CIRCUITS DE CONVERSION ACDC ET DCAC, OU ILS SONT CONSTITUES PAR DES GENERATEURS DE TENSION.PRINCIPALES APPLICATIONS: CABLES SOUS-MARINS. In order to improve the transmissivity characteristics of an electric cable (1), particularly a submarine cable, transmitting power by means of a DC voltage, an AC voltage lower than the DC voltage (E1, E2) is superimposed on the DC voltage to improve dielectric strength. The AC voltage may be generated permanently, intermittently for periods of time, or prior to installation of the cable. Converter stations (4, 5) are provided at each end of the cable for transmitting and receiving power, and one station contains a first AC generator (E1) while the other contains a passive or active AC source (E2) which provides a voltage equal and in phase with the first generator (E1) to cancel out the alternating current flow in the loop comprising the cable and converter stations. The AC generators may be separate voltage generators or may be provided by modulation of the control system controlling the power conversion means in the generator.