A three-phase, buried, high-voltage electrical line has three phase-conducting cables (2), each of the conducting cables (2) made of a succession of cable portions (3,3a,3b) connected together by different types of screen-break junctions (4), each junction (4) comprising a main structure (5) connecting a first portion (3a) to a second portion (3b) of cable (2). The main structure (5) of all the junctions (4) is identical and has a standard connection interface (7) connected to a first screen of the first portion (3a) and to a second screen of the second portion (3b), and in that a variable module (6,6a,6b,6c) furnished with a complementary connection interface (8) and with at least one linking cable (9,11,14,15), is capable of being plugged into the connection interface (7) of the main structure (5) of each junction (4).