Sigre 2015. — 8 с.
GE Digital Energy, SpainThe paper describes a new vision of backup protection, focussed the application on transmission lines (it can be applied also in other areas extending the criteria). One of the major today problems in HV Transmission Systems is remote backup correct operation. The normal practice is the Zone 3 use, but this philosophy presents limitations that have caused several blackouts, because no desired operation caused mainly by line overloads. We can define in the grid Super nodes with the corresponding overlaps, extending the coverage that normally exists for bus protection in Nodes.
As a Super Node is perfect balanced during normal operation (in a first stage we will not considered the charging line effect), differential criteria can be used to detect any internal fault in a similar way as we do with a Node but in this case, using PMU´s as sensors. The main difference is in the operation time that in case of Super node will be time delayed because it is implemented as backup protection.
