EMR-5000
IM02602012E
Commissioning: Voltage Unbalance Module
Object to be tested:
Test of the unbalanced load protection function.
Necessary means:
Three-phase AC voltage source with adjustable voltage unbalance; and
Timer.
Procedure:
Check the phase sequence:
Ensure that the
phase sequence is the same as that set in the field parameters.
Feed-in a three-phase nominal voltage.
Change to the [Measured Values/Voltage] menu.
Check the measuring value for the unbalanced voltage
»V2 Fund.«.
The measuring value displayed for
»
V2 Fund.«
should be zero (within the physical measuring accuracy).
If the displayed magnitude for V2 Fund. is the same as that for the balanced
nominal voltages fed to the relay, it implies that the phase sequence of the
voltages seen by the relay is reversed.
Now turn-off phase A.
Again check the measuring value of the unbalanced voltage
»
V2 Fund.« in the [Measured Values/Voltage] menu.
The measuring value of the unbalanced voltage
»
V2 Fund.« should now be 33% of the nominal voltage.
Turn-on phase A, but turn-off phase B.
Once again check the measuring value of the unbalanced voltage »
V2 Fund.« in the [Measured Values/Voltage]
menu. The measuring value of the unbalanced voltage
»
V2 Fund.« should be again 33%.
Turn-on phase B, but turn-off phase C.
Again check the measuring value of unbalanced voltage
»
V2 Fund.« in the [Measured Values/Voltage] menu. The
measuring value of the unbalanced voltage
»
V2 Fund.« should still be 33%.
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