Method of monitoring internal faults in electrical equipment and device for the implementation of this method

摘要

A threshold, with which the device 100 compares the difference IE - IS of the input and output values of a current passing through the equipment 8, is variable with the half-sum (IE + IS)/2 of these values, so as to increase with it. When this half-sum passes through a maximum, the threshold preserves substantially the value corresponding to this maximum for a predetermined duration, by virtue of a peak-detection circuit 21 followed by a storage circuit 22. The invention applies for example to the protection of rotating machines. <IMAGE>