Blocking method of the differential protection to avoid unwanted trips based on supervision of the continuous component of the current (Machine-translation by Google Translate, not legally binding)

摘要

Blocking method of differential protection to avoid unwanted trips based on supervision of the continuous component of the current. Method that avoids unwanted firings in electrical systems, being able to be applied to the differential protection of a rotating machine, a generator, a line or bars. It acts based on the supervision of the sign that takes the dc component of the fault current at the time of the defect, in both current transformers placed in each phase, to discriminate between each other is a defect external to the area of protection or an internal defect to it. Therefore, it allows to block the triggering of the differential protection in the event of an external defect that could saturate any of the current transformers and that would lead to an unwanted trip causing a bad protection action. (Machine-translation by Google Translate, not legally binding)