Basler Electric DGC-2020HD - Manual (Page 115)

9469300990 Rev B 105
Figure 52. Settings Explorer, Breaker Management, Synchronizer
Anticipatory versus Phase Lock Loop Synchronizer
If Phase Lock Loop synchronization is selected, the synchronizer will drive the angle between the
generator and bus toward zero, and will drive the voltage between the generator and the bus so that
the difference is less than the allowed difference set by the user.
If Anticipatory synchronization is selected, the synchronizer controls the slip frequency between the
generator and the bus. The synchronizer calculates the timing of the closing signal that allows the
generator breaker to be closed when the phase angle between the two sources is at 0 degrees. This
calculation takes into account the slip rate, the generator breaker closing time, and the phase angle
difference.
a. Sync Type -Select either Anticipatory or Phase Lock Loop as the synchronizer type.
b. Slip Frequency - The slip frequency setting is the maximum slip frequency that is in effect for
a breaker close to occur.
c. Voltage Window - The regulation offset is the maximum allowed percentage voltage
difference between the generator and the bus that is in effect for a breaker close to occur.
This is sometimes referred to as “voltage window”.
d. Min/Max Slip Control Limit - (Phase lock synchronizer only.) These settings provide
continuous slip frequency control while in phase lock synchronization.
e. Breaker Close Angle - (Phase lock synchronizer only.) The breaker close angle is the
maximum phase angle from the 0-degree phase angle that is in effect for a breaker close to
occur. This is sometimes referred to as the “angle window” or “phase window”.
f. Sync Activation Delay – The Sync Activation Delay is the length of time that the conditions for
synchronization must be met. Generator voltage and bus voltage must be within the
acceptable range for the duration of the sync activation delay. Additionally, the following
condition must be met when in Phase Lock mode. Generator and bus phase angles must be
within the acceptable breaker closing angle for the duration of the sync activation delay.
g. Sync Fail Delay - The sync fail delay is the maximum time allowed for synchronization to
occur. If the sync fail delay expires before the breaker closure occurs, a Sync Fail pre-alarm
is annunciated, but the synchronizer continues to run to allow the breaker to be closed
manually if desired. The Sync Fail Delay should be set to allow ample time for
synchronization and breaker closure to occur.
DGC-2020HD Synchronizer