(Untitled) (Untitled)(Untitled) (Untitled)(Untitled) (Untitled)(Untitled) (Untitled)(Untitled)Examples




IEVref:692-02-07ID:
Language:enStatus: Standard
Term: alert state, <of an electric power system>
Synonym1: vulnerable state, <of an electric power system>
[Preferred]
Synonym2:
Synonym3:
Symbol:
Definition: stable state in which a credible event can cause loss of load, over-stressing of components, bus voltages and system frequency outside tolerances, cascade tripping and/or instability

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

Figure 6 – Examples of electric power system states and corresponding system operation status

Note 1 to entry: When in the alert state, a further credible event can result in an unstable state.

Note 2 to entry: This entry was numbered 191-22-06 in IEC 60050-191:1990.


Publication date:2017-12-15
Source:
Replaces:
Internal notes:
CO remarks:
TC/SC remarks:
VT remarks:
Domain1:
Domain2:
Domain3:
Domain4:
Domain5: