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
Summary of Contents for Relion 670 series
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