Table 67: LT6CPDIF (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
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
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 68: LDLPDIF (87L) Input signals
Name
Type Default Description
CTFAIL BOOLEAN 0 CT failure indication from local CT supervision
OUTSERV BOOLEAN 0 Input for indicating that the IED is out of service
BLOCK BOOLEAN 0 Block of function
1MRK505222-UUS C Section 5
Differential protection
149
Technical reference manual
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