Differential device for detection of electrical currents by default. (Machine-translation by Google Translate, not legally binding)

摘要

Differential device for detection of defective electric currents, of the type comprising a trip relay, which is actuated by the current induced in the turns of the winding of a toroidal magnetic core upon the occurrence of a fault current (leakage to ground) in the transport network passing through said core, characterized in that said turns of the winding of said toroidal magnetic core are connected to the primary winding, of few turns, of a small second auxiliary toroidal magnetic core, made of a material of high magnetic permeability and provided of a secondary winding connected to the trip relay. (Machine-translation by Google Translate, not legally binding)