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Commissioning: Current Transformer Failure Supervision
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.P
•
Successful Test Result, Part 1:
The »CTS.P
« signal is generated.
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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.P
Successful Test Result, Part 2:
The »CTS.P
« signal is generated.
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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).
« signal is generated.
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« signal is generated.
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EMR-4000
www.eaton.com
IM02602009E
769
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