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It is common practice to rely on periodic triggers to run state estimators every two minutes. Manual and SCADA events such as breaker trips and analog rates of change are also used. Moreover, the average state estimator execution time ranges from one second to two minutes (with an average of about 20 seconds).

It is difficult to recommend specific state estimator voltage and angle convergence tolerances because of the different algorithms employed by different state estimators and the way specific convergence parameters are used in these algorithms. For example, some state estimators check convergence based on changes of the absolute values of voltage magnitudes and voltage phase angles (relative to ground) between successive iterations.

Common industry practice for the voltage‐magnitude convergence‐tolerance criteria (per unit) is a maximum of 0.1 (0.01 kV per unit) for both internal/observable and external/unobservable systems. For the angle difference in radians, the tolerance is 0.0100.