Basler DGC-2020ES Configuration Instruction Manual page 97

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Overvoltage 59 Single-Phase Pickup
•
The Overvoltage screen is found in the BESTCOMSPlus Settings Explorer under the Generator
Protection, Voltage category. If using the front panel, navigate to Settings > Generator Protection > 59
Overvoltage. The BESTCOMSPlus Overvoltage screen is illustrated in Figure 12-2.
Figure 12-2. Settings Explorer, Generator Protection, Voltage, Overvoltage (59) Screen
Phase Imbalance (47)
DGC-2020ES controllers are capable of protecting against voltage imbalances between any of the three
phases. The pickup setting entered is based on the PT secondary side. A phase imbalance condition is
annunciated when the difference between any of the three phases of generator voltage increases above
the 47 pickup setting for the duration of the 47 activation delay setting. A phase imbalance annunciation
can be user-selected to trigger a pre-alarm (warning) or alarm (shutdown). A phase imbalance
annunciation can also be user-configured to close a programmable output.
The hysteresis setting functions as a phase imbalance dropout by preventing rapid switching of the
pickup output.
A low-line scale factor setting is used to automatically adjust the phase imbalance pickup setting in
applications that may utilize more than one type of genset connection. The scale factor setting is
implemented when the DGC-2020ES senses a contact closure at a contact input programmed to activate
the low-line override. This triggers scaling of the protection settings. The value of the scale factor setting
serves as a multiplier for the pickup setting. For example, if a scale factor contact input is received by the
DGC-2020ES 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
BESTlogicPlus Programmable Logic when "Status Only" is selected.
Settings which are related to machine ratings can be set in either actual units of voltage or in per unit
values. When a native unit is edited, BESTCOMSPlus automatically recalculates the per unit value based
on the native unit setting and the rated data parameter (on the System Parameters, Rated Data screen)
associated with it. When a per unit value is edited, BESTCOMSPlus automatically recalculates the native
value based on the per unit setting and the rated data parameter associated with it.
Once all per unit values are assigned, if the rated data parameters are changed, BESTCOMSPlus
automatically recalculates all native unit settings based on the modified rated data parameters.
The following setting has native units of Secondary Volts, and the rated data associated with it is Rated
Secondary Volts (on the System Parameters, Rated Data screen).
• Phase Imbalance 47 Pickup
The Phase Imbalance screen is found in the BESTCOMSPlus Settings Explorer under the Generator
Protection, Voltage category. If using the front panel, navigate to Settings > Generator Protection > 47
Phase Imbalance. The BESTCOMSPlus Phase Imbalance screen is illustrated in Figure 12-3.
DGC-2020ES
12-3
Generator Protection