How successful has the implementation of system-wide common criteria for protection and control systems proved? - (PPT)

摘要

Distance function (21) as back-up protection for transformers will be applied in the future. It permits better coordination with busbar coupling circuit and line protections for faults near to or far from the transformer. Relay manufacturers shall include 21 function as an additional feature in the differential transformer protection. Spanish new setting and coordination criteria are developed only for transmission-distribution electrical power systems. They are not applicable to industrial systems or low voltage distribution systems.