4.3.5.6 Signals
Table 471: 87G, 87M Input signals
Name
Type Default Description
I_A1 Signal 0 Phase A primary current
I_B1 Signal 0 Phase B primary current
I_C1 Signal 0 Phase C primary current
I_A2 Signal 0 Phase A secondary current
I_B2 Signal 0 Phase B secondary current
I_C2 Signal 0 Phase C secondary current
BLOCK BOOLEAN 0=False Block signal for activating the blocking mode
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 472: 87G, 87M Output signals
Name Type Description
TRIP BOOLEAN Trip
OPR_LS BOOLEAN Trip from low set
OPR_HS BOOLEAN Trip from high set
INT_BLKD BOOLEAN Internal block status
4.3.5.7 Settings
Table 473: 87G, 87M Group settings (Basic)
Parameter
Values (Range) Unit Step Default Description
Low trip value 5...30 %Ir 1 5 Basic setting for the stabilized stage pickup
High trip value 100...1000 %Ir 10 500 Instantaneous stage trip value
Slope section 2 10...50 % 1 30 Slope of the second line of the operating
characteristics
End section 1 0...100 %Ir 1 50 Turn-point between the first and the second
line of the operating characteristics
End section 2 100...300 %Ir 1 150 Turn-point between the second and the third
line of the operating characteristics
Section 4 1MAC059074-MB A
Protection functions
584 615 series ANSI
Technical Manual
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