Current Phase Unbalance
The Current Phase Unbalance function only applies to three-phase TeSys avatars.
If enabled, this protection function performs the following:
-
Signals a Current Phase Unbalance Alarm when the current phase unbalance exceeds the specified Current Phase Unbalance Alarm Level
-
Triggers a Current Phase Unbalance Trip when the current phase unbalance exceeds the specified Current Phase Unbalance Trip Level for a time longer than the specified Current Phase Unbalance Trip Delay
NOTE: Separate trip delays are configurable for Run State and Start State.
Current Phase Unbalance Trip and Alarm
|
I1 |
Phase 1 Current |
I2 |
Phase 2 Current |
|
I3 |
Phase 3 Current |
%Iunb |
%Current Phase Unbalance |
|
Ialarm |
Current Phase Unbalance Alarm Level |
Itrip |
Current Phase Unbalance Trip Level |
|
T1 |
Current Phase Unbalance Trip Delay—Start |
T2 |
Current Phase Unbalance Trip Delay—Run |
|
A |
Motor Start State |
B |
Motor Run State |
|
C |
Current Phase Unbalance Alarm |
D |
Current Phase Unbalance Trip |
-
The maximum difference between any individual phase RMS current (in absolute value) and the average of the three-phase RMS currents
-
Divided by the average of the three-phase RMS currents