Resumen
Blocking method of the differential protection to avoid unwanted trips based on supervision of the homopolar component. Method that allows to avoid unwanted firings of the differential protection of generators with isolated neutral or grounded through a high ohmic value impedance. This method is based on the supervision of the homopolar component both on the neutral side and on the side of the terminals of the machine, so that if it takes a value higher than the threshold previously set, it is a clear indication that at least it has saturated a current transformer and could lead to a bad performance of the differential protection. Therefore, when the homopolar component exceeds the set threshold, the settings of the trip curve are modified to establish a less restrictive characteristic that prevents the bad operation of the protection. (Machine-translation by Google Translate, not legally binding)