METHOD FOR DIAGNOSING THE CAUSE OF TRIPPING OF AN ELECTRICAL PROTECTION DEVICE, AUXILIARY DEVICE AND ELECTRICAL SYSTEM FOR IMPLEMENTING SUCH A METHOD

摘要

#$%^&*AU2019236623A120200416.pdf#####ABSTRACT This method for diagnosing the cause of tripping of an electrical protection device includes, after detection by the auxiliary device of a loss of electrical power, determining a type of electrical fault on the basis of recorded values, the determining operation including: - comparing, with a first threshold value, the largest value of the maximum intensity of the current from the recorded values for a plurality of measurement intervals preceding the loss of power, a short circuit being diagnosed if the largest value of the maximum intensity is greater than a first threshold value; - comparing, with a second threshold value, the largest RMS value of the current from the recorded values, an overload being diagnosed if the largest RMS value is greater than a second threshold value.1/3 10 I 8 2 FIG.1 u -~11 12 -,F 1 L11 8 22 FIG.2 3 -34- -36- -38- 28 -40-- -42- -44 FIG.3