Basler DECS-250, Instruction Manual

Page: 61 / 352

9440300990 Rev J 45
DECS-250 Protection
Figure 30. Loss of Sensing Protection Settings
A
Voltage Balanced Level: Adjustable from 0 to 100% in 0.1% increments.
B
Voltage Unbalanced Level: Adjustable from 0 to 100% in 0.1% increments.
C
Time Delay: Adjustable from 0 to 30 seconds in 0.1 second increments.
D
Transfer to Manual: Select Disabled or Enabled.
E
Mode: Select Disabled or Enabled.
Frequency Protection
BESTCOMSPlus Navigation Path: Settings Explorer, Protection, Frequency
HMI Navigation Path: Settings, Protection, Frequency Protection 81
The frequency of the generator terminal voltage is monitored for overfrequency and under-frequency
conditions.
Overfrequ e ncy
An overfrequency condition occurs when the frequency of the generator voltage exceeds the 81O pickup
threshold
A
for the duration of the 81O time delay setting
B
. Overfrequency protection can be enabled and
disabled
C
without altering the pickup and time delay settings. Overfrequency pickup and trip elements in
BESTlogic Plus can be used in a logic scheme to initiate corrective action in response to the condition.
BESTCOMS Plus overfrequency settings are illustrated in Figure 31.
Figure 31. Overfrequency Protection Settings
A
Overfrequency (81O) Pickup (Hz) : Adjustable from 30 to 70 hertz in 0.01 hertz increments.
B
Overfrequency (81O) Time Delay (s) : Adjustable from 0.1 to 300 seconds in 0.1 second increments.
C
Overfrequency (81O) Mode : Select Disabled or Over.