
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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