IEVref:692-02-03ID:
Language:enStatus: Standard
Term: unstable state, <of an electric power system>
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Definition: perturbed state wherein the system, even when not disturbed, will not remain in a steady state, or cannot spontaneously return to a steady state after being subjected to a disturbance of prescribed magnitude

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 an unstable state, the electric power system is experiencing cascade tripping, voltage instability or other instability likely to result in system collapse.

Note 2 to entry: This entry was numbered 191-22-02 in IEC 60050-191:1990.


Publication date:2017-12-15
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