Basler Electric DGC-2020 - Manual (Page 182)

generator breaker from a “dead” generator to a “dead” bus, both the Dead Bus Close Enable setting and
the Dead Gen Close Enable setting, in Breaker Hardware settings, must be set to enabled. After all
breakers are closed, the gensets are started and pulled into sync when the AVRs are turned on. The user
must develop logic to start the generators and turn on excitation in the voltage regulators at the correct
time for orderly system startup.
CAUTION
Use caution when connecting “dead” generators to a “dead” bus. Undesired
operation or system damage could occur if the bus becomes “live” while “dead”
generators are connected to it.
The BESTCOMSPlus Breaker Hardware screen is illustrated in Figure 4-61.
Figure 4-61. Breaker Hardware
A Generator Breaker: No or Yes.
B Mains Breaker: No or Yes.
C Contact Type: Continuous or Pulse. If Continuous is selected, the outputs will be on during the time that
the desired Close or Open condition is in effect. If Pulse is selected, the duration of the pulses are set
by the Open Pulse Time and Close Pulse Time settings.
D Open Pulse Time: Adjustable from 0.01 to 0.80 s in 0.01 s increments. This setting applies only when
Contact Type is Pulse. This time should be
≥ the Breaker Closing Time setting.
E Close Pulse Time: Adjustable from 0.01 to 0.80 s in 0.01 s increments. This setting applies only when
Contact Type is Pulse. This time should be
≥ the Breaker Closing Time setting.
F Transition Delay: Adjustable from 0 to 1,000, in increments of 1 second.
G Breaker Closing Time: Adjustable from 0 to 800 ms in 5 ms increments. This specifies the amount of
time the breaker takes to close once a close contact is applied to it. This time is used for anticipatory
synchronization to issue a close pulse a certain time before the 0 degree slip angle is reached so that
when the breaker actually closes, the slip angle is near 0 degrees.
H Breaker Close Wait Time: Adjustable from 0.1 to 600 s in 0.1 s increments. This specifies the amount of
time the DGC-2020 will wait between issuing a close pulse to a breaker and expecting the breaker
status to be indicated as closed. If this time expires before the breaker status is indicated as closed, a
Breaker Close Fail pre-alarm will be annunciated. The pre-alarm can be cleared by switching to OFF
mode or pressing the Reset button on the front panel of the DGC-2020.
I Breaker Fail Output Configuration: Retain or Remove.
J Open Attempts: Adjustable from 1 to 20, in increments of 1.
K Close Attempts: Adjustable from 1 to 20, in increments of 1.
L Retry Delay: Adjustable from 0 to 1,200, in 1 s increments.
M External Status Change Action: Ignore, Follow Always, Follow in Auto
N Dead Bus Close Enable: Disable or Enable.
4-72 DGC-2020 BESTCOMSPlus
® Software
9400200990 Rev X