9440300990 6-5
DECS-250 Synchronizer
A failed bus is recognized when the bus voltage or frequency does not meet the established stability
criteria for the duration of the failed bus activation delay. Bus stability parameters are described in Bus
Stability.
Bus Stability
Before initiating a breaker closure (tying the generator to a live bus), the bus voltage must be stable.
Several settings are used to determine bus stability. These settings include pickup and dropout levels for
overvoltage, undervoltage, overfrequency, and underfrequency. Recognition of bus stability is further
controlled by a bus stability activation delay. Breaker closure is not considered if the voltage conditions
are not within the stability pickup and dropout settings for the duration of the stability activation delay.
Figure 6-4. Generator and Bus Condition Detection Settings
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