A METHOD AND APPARATUS FOR PROVIDING DIFFERENTIAL PROTECTION FOR AN ELECTRICAL LINK IN A MEDIUM, HIGH, OR VERY HIGH VOLTAGE NETWORK

摘要

The invention relates to a method and a system for the differential protection of an electrical link (7) in a medium-voltage, high-voltage or very high-voltage network. This method, in which two differential protection devices (8, 9) are placed at the two ends (A, B) of this link (7), includes a step during which a comparison is made between the locally measured current and the remotely measured current after these devices have been resynchronized by shifting the data received from the remotely located end by half the round-trip propagation time, and a second step during which, if an angular phase shift between two currents is observed after resynchronization, an automatic compensation is carried out by controlling the angle of the current vectors.