4-42 DGC-2020 BESTCOMSPlus Software 9400200990 Rev I
K
Breaker Close Wait Time: Adjustable from 0.1 to 600 s in 0.1 s increments.
L
Dead Bus Close Enable: Enable or Disable.
Bus Condition Detection
DGC-2020 detection of dead bus voltages (for dead bus breaker closure) is controlled by a Dead Bus
Threshold setting
A
and a Dead Bus Activation Delay setting
B
. A dead bus is recognized when the voltage
decreases below the threshold setting for the duration of the time delay setting.
Before the DGC-2020 initiates a breaker closure, the generator and mains voltages must be stable. The
DGC-2020 uses several settings to determine voltage stability. These settings include pickup and dropout
levels for overvoltage
C
, undervoltage
D
, overfrequency
E
, and underfrequency
F
. Recognition of bus stability
is further controlled by two timers. Voltage conditions must meet the stability pickup and dropout settings
for the duration of the Bus Stable Activation Delay
G
. Breaker closure is not considered if the voltage
conditions do not meet the stability pickup and dropout settings for the duration of the Bus Failed
Activation Delay
H
setting.
BESTCOMSPlus bus condition detection settings (DGC-2020, Breaker Management, Bus Condition
Detection) are illustrated in Figure 4-39.
Figure 4-39. Bus Condition Detection Settings
A
Dead Bus Threshold: Adjustable from 0 to 4,800 Vac in 1 Vac increments.
B
Dead Bus Time Delay: Adjustable from 0.1 to 600 s in 0.1 s increments.
C
Gen and Bus Stable Overvoltage Pickup and Dropout: Adjustable from 10 to 1,200 Vac in 1 Vac
increments.
NOTE
Voltage threshold and pickup settings on the Bus Condition Detection screen are
entered in primary values (generator side of VT).
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