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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