EMR-4000 IM02602009E
Commissioning: Current Transformer Failure Supervision
Preconditions:
1.Measurement of all three-phase currents (are applied to the measuring inputs
of the device).
2.The ground current is detected via a zero sequence transformer (not in
residual connection).
Object to Be Tested:
Check of the CT Supervision (by comparing the calculated with the measured ground current)
.
Necessary Means:
Three-phase current source.
Procedure, Part 1:
•Set the limiting value of the CTs to
»delta I=0.1*In«
.
•Feed a three-phase, symmetrical current system (approx. nominal current) to the secondary side.
•Disconnect the current of one phase from one of the measuring inputs (the symmetrical feeding at the secondary side
has to be maintained).
•Make sure that the »CTS.ALARM« signal is generated.
Successful Test Result, Part 1:
The »CTS.ALARM« signal is generated.
Procedure, Part 2:
Feed a three-phase, symmetrical current system (approx. nominal current) to the secondary side.
Feed a current that is higher than the threshold value for the measuring circuit supervision to the ground current
measuring input.
Make sure that the »CTS.ALARM« signal is generated.
Successful Test Result, Part 2:
The »CTS.ALARM« signal is generated.
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