Basler DGC-2020 Instruction Manual page 98

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
A
Threshold setting and a Dead Bus Activation Delay setting
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
C
levels for overvoltage , undervoltage
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
conditions do not meet the stability pickup and dropout settings for the duration of the Bus Failed
H
Activation Delay setting.
Voltage threshold and pickup settings on the Bus Condition Detection screen are
entered in primary values (generator side of VT).
BESTCOMSPlus bus condition detection settings (DGC-2020, Breaker Management, Bus Condition
Detection) are illustrated in Figure 4-39.
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.
4-42
D E
, overfrequency , and underfrequency
G
. Breaker closure is not considered if the voltage
NOTE
Figure 4-39. Bus Condition Detection Settings
DGC-2020 BESTCOMSPlus Software
B
. A dead bus is recognized when the voltage
F
. Recognition of bus stability
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