北美大停电 ● 14:14 Alarm logger fails and operators are not aware No further alarms to FE operators ●14：20 Several remote consoles fail ● 14:41 EMS server hosting alarm processor and other functions fails to backup ●14：54 Backup server fails EMS continues to function but with very degraded performance (59 second refresh) FE system data passed normally to others:MISO and AEP AGC function degraded and strip charts flat-lined ● 15:08 IT warm reboot of EMS appears to work but alarm process not tested and still in failed condition ● No contingency analysis of events during the day including loss of East Lake 5 and subsequent line trips北美大停电