Name Type Default Description
I_C(2) SIGNAL 0 Phase C secondary current
BLOCK BOOLEAN 0=False Block
BLK_OPR_LS BOOLEAN 0=False Blocks trip outputs from biased stage
BLK_OPR_HS BOOLEAN 0=False Blocks trip outputs from instantaneous stage
Table 434: 87T Output signals
Name Type Description
TRIP BOOLEAN Trip combined
OPR_LS BOOLEAN Trip from low set
OPR_HS BOOLEAN Trip from high set
BLKD2H BOOLEAN 2nd harmonic restraint block status
BLKD5H BOOLEAN 5th harmonic restraint block status
BLKDWAV BOOLEAN Waveform blocking status
4.3.2.8 Settings
Table 435: 87T Group settings (Basic)
Parameter
Values (Range) Unit Step Default Description
High trip value 500...3000 %Ir 10 1000 Instantaneous stage setting
Low trip value 5...50 %Ir 1 20 Basic setting for biased operation
Slope section 2 10...50 % 1 30 Slope of the second line of the operating
characteristics
End section 2 100...500 %Ir 1 150 Turn-point between the second and the third
line of the operating characteristics
Restraint Mode 5=Waveform
6=2.h + waveform
8=5.h + waveform
9=2.h + 5.h + wav
9=2.h + 5.h + wav Restraint Mode
Pickup value 2.H 7...20 % 1 15 The ratio of the 2. harmonic to fundamental
component required for blocking
Pickup value 5.H 10...50 % 1 35 The ratio of the 5. harmonic to fundamental
component required for blocking
Section 4 1MAC059074-MB A
Protection functions
532 615 series ANSI
Technical Manual
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