measuring device for measuring differential current, a tripping module comprising such a measuring device and a distribution unit having such a module

摘要

"measuring device for measuring differential current, a trip module comprising such a measuring device and a distribution unit having such a module". The present invention relates to a differential current measuring device (9) designed to measure the differential current in at least two current lines (25), comprising a first magnetic circuit (16) designed to surround the current lines ( 25) forming a primary circuit of a transformer, a first secondary winding (11) wound around said magnetic circuit and forming the secondary circuit of the transformer, a metal shield (10) surrounding a first secondary winding (11) and the magnetic circuit (16). The differential current measuring device (9) further comprises at least a second secondary winding (2) surrounding at least a portion of the metal shield (10). This second winding forms a second magnetic circuit of at least one second current sensor designed to supply an electrical signal representative of a current flowing in at least one current line (25).