Name Type Description
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
IDMAG_A REAL Magnitude of fund. freq. differential current, phase A
IDMAG_B REAL Magnitude of fund. freq. differential current, phase B
IDMAG_C REAL Magnitude of fund. freq. differential current, phase C
IBIAS REAL Magnitude of the bias current, common for phase A,B.C
IDMAG_NS REAL Magnitude of the negative sequence differential current
Table 64: LT3CPDIF (87LT) 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 65: LT3CPDIF (87LT) 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
Table continues on next page
1MRK505222-UUS C Section 5
Differential protection
147
Technical reference manual
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