AN ELECTRONIC DEVICE FOR MEASURING A DIFFERENTIAL CURRENT IN AN ELECTRIC LINE

An electronic device (1) for measuring a differential current (ID) in an electric line (100) having a plurality of conductors, said electronic device comprising: - a sensing circuit (2) comprising: - a current transformer (21) having a magnetic core (211) through which the conductors of said electric line pass, a secondary winding (212) and an excitation winding (213) along which an excitation current (IE) circulates to polarize said magnetic core (211); - an output circuit section (22) electrically connected to said secondary winding (212) and configured to provide a first signal (V1). The electronic device (1) further comprises: - first signal processing means (3) configured to process said first signal (V1) and provide a second signal (VD) indicative of said differential current (ID); - second signal processing means (4) configured to process said second signal (VD) and provide a first measurement signal (IDCM) indicative of the absolute value of a time- invariant component of said differential current (ID); - third signal processing means (5) configured to process said first signal (V1) and provide third and fourth signals (S1, S2) indicating whether said magnetic core (211) operates in a positive and/or in a negative saturation region of the hysteresis loop of said magnetic core; - fourth signal processing means (6) configured to process said third and fourth signals (S1, S2) and provide a second measurement signal (SDC) indicative of the direction of the time-invariant component of said differential current (ID). Il est décrit un dispositif électronique (1) servant à mesurer un courant différentiel dans une ligne électrique (100) ayant une pluralité de conducteurs, ledit dispositif électronique comprenant : un circuit de détection (2) comprenant un transformateur de courant (21) ayant un noyau magnétique (211) à travers duquel passent les conducteurs de ladite ligne électrique, un enroulement secondaire (212) et un enroulement d'excitation (213) le long desquels un courant d'excitation circule afin de polariser ledit noyau magnétique (211), ainsi quune section de circuit de sortie (22) raccordée électriquement audit enroulement secondaire (212) et dont la configuration lui permet de fournir un premier signal (V1). Le dispositif électronique (1) comprend également : un premier moyen de traitement du signal (3) dont la configuration lui permet de traiter ledit premier signal (V1) et de fournir un deuxième signal indicatif dudit courant différentiel; un