An apparatus can include a fault condition detector configured to detect a fault condition in an electrical system, a delta d-q power value generator configured to generate a delta d-q power value temporally corresponding to the detected fault condition, and a characterizer circuit configured to characterize...http://www.google.es/patents/US7403364?utm_source=gb-gplus-sharePatente US7403364 - Power system fault characterization using transformed values
Power system fault characterization using transformed values
