| stable state that is not an alert state|
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: In North America, the term "secure state" is used for a stable state that is not a potentially unstable state.
Note 2 to entry: This entry was numbered 191-22-09 in IEC 60050-191:1990.