Resumen
Blocking method of the differential protection to avoid unwanted trips based on joint supervision of the phases. It is a method that avoids unwanted firings in electrical systems with isolated neutral, or through a high-ohmic value earthing impedance, and where the fault current in case of a single-phase ground fault is not enough to trigger differential protection. This method is based on an action logic based on the joint supervision of the phases so that it only allows tripping if the operating conditions corresponding to a two-phase or three-phase fault are present, in the electrical systems with the grounding described previously. . (Machine-translation by Google Translate, not legally binding)