Electrical protection system and method for a high-voltage direct current system

An electrical protection system for protecting a high-voltage DC electrical installation, the electrical protection system comprising:

• at least one sensor configured to perform measurements of a non-electrical physical quantity, hereinafter referred to as a non-electrical sensor;
• at least one sensor configured to perform measurements of an electrical physical quantity, hereinafter referred to as an electrical sensor;
• and
• a control unit connected to said at least one non-electrical sensor and to said at least one electrical sensor, the control unit comprising
• electronic circuitry configured to command a circuit breaker of the high-voltage DC electrical installation to open when, in a sliding time window, called sliding window SW3, an abnormal non-electrical phenomenon is detected by measurements of said at least one non-electrical sensor and when, furthermore, an abnormal electrical phenomenon is detected by virtue of measurements of said at least one electrical sensor.