Basler Electric DGC-2020 - Manual (Page 190)

Voltage Correction
Generator voltage correction is defined by the voltage window setting H . This setting, expressed as a
percentage of the bus voltage, determines the band of generator voltage surrounding the bus voltage
when breaker closure will be considered. If the Vgen>Vbus setting
I is enabled, the DGC-2020 will drive
the generator voltage to be greater than the bus voltage by an amount equal to the regulation offset
setting divided by two.
Synchronization Failure
The maximum desired duration for synchronizing to take place is established by the sync fail activation
delay setting
J . If synchronization (breaker closure) fails to occur within this time setting, generator
synchronization will be aborted and a failure will be annunciated. Note that if either bus goes unstable, the
synchronizer timers are reset.
Gain Settings
Sync speed K gain and sync voltage L gain settings are provided to increase the loop gain of the automatic
synchronizer. This allows the synchronizer function to be aggressive during synchronization and stable
during speed trim operation.
NOTES
If the generator frequency is 400 Hz, the settings on the Synchronizer screen
do NOT apply. In this case, BESTCOMSPlus will not allow these settings to be
changed.
When using the DGC-2020 synchronizer, it is recommended that local DGC-
2020 relay outputs be used for breaker closing commands to minimize the
possibility of closures outside of desired breaker closing angles.
Figure 4-66. Synchronizer
A Sync Type: Phase Lock Loop or Anticipatory.
B Slip Frequency: Adjustable from 0.01 to 0.5 Hz in 0.01 Hz increments. If Anticipatory synchronization is
selected, this specifies the maximum acceptable slip under which a close command can occur. If Phase
Lock Loop synchronization is selected and the slip angle is within the Breaker Closing Angle criterion for a
period long enough to indicate the slip frequency criterion has been met, a breaker close command can
be issued.
C Min Slip Control Limit: Adjustable from 0 to 2 Hz in 0.01 Hz increments.
D Max Slip Control Limit: Adjustable from 0 to 2 Hz in 0.01 Hz increments.
E Fgen>Fbus: Enable or Disable.
F Breaker Closing Angle: Adjustable from 3 to 20
° in 0.5° increments. If Phase Lock Loop synchronization
is selected, this specifies the maximum acceptable slip angle under which a breaker close command can
be issued.
G Sync Activation Delay: Adjustable from 0.1 to 0.8 s in 0.1 s increments.
H Voltage Window: Adjustable from 2 to 15% of nominal generator voltage in 0.5% increments. This
specifies the voltage acceptance window for the synchronization function.
4-80
DGC-2020 BESTCOMSPlus
® Software
9400200990 Rev X