10-6 9440300990
Protection DECS-250
BESTlogicPlus can be used in a logic scheme to initiate corrective action in response to the condition.
BESTCOMSPlus overfrequency settings are illustrated in Figure 10-7.
Figure 10-7. Overfrequency Protection Settings
Underfrequency
An underfrequency condition occurs when the frequency of the generator voltage decreases below the
81U pickup threshold for the duration of the 81U time delay setting. A voltage inhibit setting, expressed as
a percentage of the rated generator voltage, can be implemented to prevent an underfrequency trip from
occurring during startup when the generator voltage is rising toward the nominal level. Underfrequency
protection can be enabled and disabled without altering the pickup, delay, and inhibit settings.
Underfrequency pickup and trip elements in BESTlogicPlus can be used in a logic scheme to initiate
corrective action in response to the condition. BESTCOMSPlus underfrequency settings are illustrated in
Figure 10-8.
Figure 10-8. Underfrequency Protection Settings
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