Apparatus of the detection of the default of isolation of a device of the branch in a network of transmission or distribution of electrical energy and method of detection corresponding

摘要

This apparatus of the insulation defect detection of at least one device connected in a transmission or distribution network of electric energy comprises means (10) for measuring the leakage current disposed on a line (19a, 19b, 19c) from the ground of the device, a digital / analog converter - of the measurement signal, and a unit (14) of the signal treatment comprising means of comparison (75) of the measurement signal with a maximum threshold value representative of the maximum value of the leakage current permitted to flow in said line (19a, 19b, 19c) from the ground in order to obtain an insulation defect signal. The processing unit (14) comprises means of discrimination (76), in the insulation defect signal, between a component of a useful signal and a component of a disturbing signal.