Improvements introduced in the manufacture of differential protection devices of electrical installations against earth defect currents (Machine-translation by Google Translate, not legally binding)

摘要

DIFFERENTIAL PROTECTION DEVICE, AGAINST EARTH DEFECT CURRENTS, FOR ELECTRICAL INSTALLATIONS. IT CONSISTS OF A CURRENT TRANSFORMER (A) WHOSE PRIMARY IS CONSTITUTED BY THE OWN PHASES OF THE ALTERNATE LINE AND WHOSE SECONDARY DELIVERS THE ALTERNATE DEFECTIVE SIGNAL AT THE ENTRY OF AN ELECTRONIC CIRCUIT (B), SENSITIVE TO ITS PERIOD; OF A RELAY OR WINDING OF THE MAGNETO-DYNAMIC TRIGGER (C) THAT TRIGGERS THE MECHANICAL BREAKER SYSTEM (D) THAT DISCONNECTS THE STAGES OF THE ALTERNATE LINE OF THE INSTALLATION; AND OF THE ABOVE ELECTRONIC CIRCUIT THAT IS CONSTITUTED BY A VOLTAGE CONTROLLED OSCILLATOR (OS), BY A PHASE DETECTOR (D), BY A LOOP FILTER (F1), BY AN AMPLIFIER CIRCUIT (DP) AND BY A TRIP INVERTER. (Machine-translation by Google Translate, not legally binding)