5.1.4 Input and output signals
Table 60: L3CPDIF (87L) Input signals
Name Type Default Description
I3P1 GROUP
SIGNAL
- Three phase current grp1 samples and DFT values
I3P2 GROUP
SIGNAL
- Three phase current grp1 samples and DFT values
I3P3 GROUP
SIGNAL
- Three phase current grp1 samples and DFT values
Table 61: L3CPDIF (87L) Output signals
Name Type Description
TRIP BOOLEAN Main Trip Signal
TR_A BOOLEAN Trip signal from phase A
TR_B BOOLEAN Trip signal from phase B
TR_C BOOLEAN Trip signal from phase C
TRIPRES BOOLEAN Trip by restrained differential 87L
TRIPUNRE BOOLEAN Trip by unrestrained differential 87H
TRIPENHA BOOLEAN Trip by Enhanced restrainted differential 87LEnhanced
PICKUP BOOLEAN Main Pickup output signal
PU_A BOOLEAN Pickup signal from phase A
PU_B BOOLEAN Pickup signal from phase B
PU_C BOOLEAN Pickup signal from phase C
BLK2H BOOLEAN Block signal due to second harmonic
BLK2H_A BOOLEAN Block signal due to second harmonic phase A
BLK2H_B BOOLEAN Block signal due to second harmonic phase B
BLK2H_C BOOLEAN Block signal due to second harmonic Phase C
BLK5H BOOLEAN Block signal due to fifth harmonic
BLK5H_A BOOLEAN Block signal due to fifth harmonic phase A
BLK5H_B BOOLEAN Block signal due to fifth harmonic phase B
BLK5H_C BOOLEAN Block signal due to fifth harmonic phase C
OPENCT BOOLEAN An open CT was detected
ALARM BOOLEAN Alarm for sustained differential current
OPENCTAL BOOLEAN Open CT Alarm output signal. Issued after a delay ...
ID_A REAL Instantaneous differential current, phase A
ID_B REAL Instantaneous differential current, phase B
ID_C REAL Instantaneous differential current, phase C
Table continues on next page
1MRK505222-UUS C Section 5
Differential protection
145
Technical reference manual
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