Method For Controlling An Installation Allowing DC Current To Be Transmitted In A Network While Protecting Said Network From A Short Circuit Fault

A method for controlling an installation (1) for transmitting electricity comprising a direct current transmission network (3) comprising a group (2) of electricity transmission lines (4) linked to one another, each transmission line (4) comprising a pair of two line circuit breakers (5a, 5b) arranged at the opposite ends of said transmission line (4), said installation comprising a number N of stations (6) for converting alternating current to direct current each associated with a safety system (7), each converter station (6) being linked to the group (2) of transmission lines (4) and being associated with a maximum contribution of short-circuit current, each safety system (7) is capable of interrupting a direct current corresponding to the maximum contribution of short-circuit current of an associated converter station (6), the line circuit breakers (5a, 5b) each having a breaking capacity capable of interrupting a direct current corresponding to a highest of the maximum contributions of short-circuit current of the converter stations (6), the method comprises, following an occurrence of a short-circuit fault on one of the transmission lines (4), the following steps:

• a step (E1) of opening at least N-1 safety systems (7) such that, for each safety system (7) that is opened, a contribution to the flow of current through the group (2) of transmission lines (4) originating from the converter station (6) associated with said safety system (7) that is opened is removed;
• a step (E2) of finding the short-circuit fault to identify a faulty transmission line (4);
• a step (E3), implemented after identification of the faulty transmission line (4) by the finding step (E2), of isolating the faulty transmission line (4) by opening line circuit breakers (5a, 5b) of said faulty transmission line (4).