9424200996 84-39
BE1-11m Settings Calculation Examples
Figure 84-48. Protection, Current, Instantaneous Overcurrent (50-3) Screen
Instantaneous Overcurrent (50-4) - Unbalanced Protection Alarm
If there is an increasing voltage unbalance in the power system (incorrect phase connections, stator turn-
to-turn faults, or motor winding connections corroding or loose, for example), the BE1-11m can alarm so
that you can take action before tripping the motor on unbalance current. Use the 50-4 element to alert
operations and maintenance personnel to take corrective action.
The pickup setting calculation is shown in Equation 84-31.
=
1
20
(
5%
)
(
4
)
=
1
2
5% 4 = 10%
Equation 84-31. 50-4 Pickup
Select Unbalance alarm mode, set the Pickup setting to 10%, and set the Time Delay to 10 seconds as
shown in Figure 84-49.
Figure 84-49. Protection, Current, Instantaneous Overcurrent (50-4) Screen
User Programmable Alarm 1 is used for reporting a minor alarm, which indicates the unbalance alarm.
Use the Settings Explorer to navigate to Alarm Configuration, User Programmable Alarms, and name
User Programmable Alarm 1 to “Unbalance Alarm” as shown in Figure 84-50.
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