Phase imbalance (47), Figure 4-42. overvoltage protection settings -46 – Winco DGC-2020 User Manual
Page 116
settings. For example, if a scale factor contact input is received by the DGC-2020 and the scale factor
setting is 2.000, the pickup setting will be doubled (2.000
PU).
The element is disabled when Alarm Configuration is set to “None”. Element status is available in
BESTlogic+ Programmable Logic when “Status Only” is selected.
BESTCOMSPlus voltage protection settings (DGC-2020, Generator Protection, Voltage, Overvoltage) are
illustrated in Figure 4-42. The 59-1 element is shown.
Figure 4-42. Overvoltage Protection Settings
A
Pickup: Adjustable from 70 to 576 Vac in 1 Vac increments.
B
Activation Delay: Adjustable from 0 to 30 s in 0.1 s increments.
C
Alarm Configuration: None, Alarm, Pre-Alarm, or Status Only.
D
Hysteresis: Adjustable from 1 to 60 Vac in 1 Vac increments.
E
Low Line Scale Factor: Adjustable from 0 to 3.000 in increments of 0.001.
Phase Imbalance (47)
DGC-2020 controllers with enhanced generator protection (style number xxxxxxExx) are capable of
protecting against voltage imbalances between any of the three phases. The pickup setting entered is
based on the VT secondary side (DGC-2020). A phase imbalance condition is annunciated when the
difference between any of the three phases of generator voltage increases above the 47 pickup setting
A
for the duration of the 47 activation delay setting
B
. A phase imbalance annunciation can be user-selected
to trigger a pre-alarm
C
(warning) or alarm
C
(shutdown). A phase imbalance annunciation can also be
user-configured to close a programmable output.
The hysteresis setting
D
functions as a phase imbalance dropout by preventing rapid switching of the
pickup output.
The element is disabled when Alarm Configuration is set to “None”. Element status is available in
BESTlogic+ Programmable Logic when “Status Only” is selected.
BESTCOMSPlus voltage protection settings (DGC-2020, Generator Protection, Voltage, Phase
Imbalance) are illustrated in Figure 4-43.
Figure 4-43. Phase Imbalance Protection Settings
4-46
DGC-2020 BESTCOMSPlus Software
9400200990 Rev K