| alert state in which a credible event will result in instability, voltage collapse or cascade tripping|
Figure 2 – Electric power system states
NOTE The arrows indicate the most important state transitions caused by credible events. Recovery transitions, in opposite directions, are effected by operator intervention.
Figure 3 – Examples of transitions within electric power system states
Note 1 to entry: This entry was numbered 191-22-07 in IEC 60050-191:1990.