6-2 9440300990
Synchronizer DECS-250
compensation setting should contain a value of 330°. This value is added to the metered bus angle
resulting in an adjusted slip angle of zero degrees. Only the metered bus angle is affected by the angle
compensation setting, the metered generator angle is not biased by the DECS-250.
Equation 6-1. DECS-250 Metered Slip Angle
Where:
G = metered generator angle
B = metered bus angle
A = angle compensation value
Gen to Bus PT Match Level
A generator to bus PT matching level setting is provided to compensate for step-up or step-down
transformers in the system. The DECS-250 adjusts the sensed generator voltage by this percentage. This
setting also appears on the Voltage Matching screen, below. When the value is changed, it is reflected in
both places. To calculate the appropriate Gen to Bus PT Match Level value, refer to Equation 6-2.
× 100 =
(
%
)
Equation 6-2. Gen to Bus PT Match Level Calculation
Failure of Synchronization
Generator synchronization is aborted if generator synchronization fails to occur within a timeframe
established by the user.
When generator voltage rotation does not match bus voltage rotation a Phase Rotation Mismatch alarm is
annunciated and generator synchronization is aborted.
BESTCOMSPlus
®
generator synchronization settings are illustrated in Figure 6-1.
Figure 6-1. Generator Synchronizer Settings
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