Name
Values (Range)
Unit
Step
Default
Description
IMaxAddDelay
0.20 - 5.00
IB
0.01
1.00
Below limit, extra delay can be applied,
multiple of IBase
tDefTime
0.000 - 6.000
s
0.001
0.000
Definite time additional delay in seconds
tMinInv
0.001 - 6.000
s
0.001
0.010
Inverse Delay Minimum Time. In seconds
CurveType
ANSI Ext. inv.
ANSI Very inv.
ANSI Norm. inv.
ANSI Mod. inv.
ANSI Def. Time
L.T.E. inv.
L.T.V. inv.
L.T. inv.
IEC Norm. inv.
IEC Very inv.
IEC inv.
IEC Ext. inv.
IEC S.T. inv.
IEC L.T. inv.
IEC Def. Time
Programmable
RI type
RD type
-
-
IEC Def. Time
19 curve types. Example: 15 for definite time
delay.
TD
0.05 - 1.10
-
0.01
1.00
Time Multiplier Setting (TMS) for inverse
delays
IdiffAlarm
0.05 - 1.00
IB
0.01
0.15
Sustained differential current alarm, factor of
IBase
tAlarmdelay
0.000 - 60.000
s
0.001
10.000
Delay for alarm due to sustained differential
current, in s
Table 77:
LT3CPDIF (87LT) Group settings (advanced)
Name
Values (Range)
Unit
Step
Default
Description
EndSection1
0.20 - 1.50
IB
0.01
1.25
End of section 1, as multiple of reference
current IBase
EndSection2
1.00 - 10.00
IB
0.01
3.00
End of section 2, as multiple of reference
current IBase
SlopeSection2
10.0 - 50.0
%
0.1
40.0
Slope in section 2 of operate-restrain
characteristic, in %
SlopeSection3
30.0 - 100.0
%
0.1
80.0
Slope in section 3 of operate- restrain
characteristic, in %
I2/I1Ratio
5.0 - 100.0
%
1.0
10.0
Max. ratio of second harmonic to fundamental
harm dif. curr. in %
I5/I1Ratio
5.0 - 100.0
%
1.0
25.0
Max. ratio of fifth harmonic to fundamental
harm dif. curr. in %
p
0.01 - 1000.00
-
0.01
0.02
Settable curve parameter, user-
programmable curve type.
a
0.01 - 1000.00
-
0.01
0.14
Settable curve parameter, user-
programmable curve type.
Table continues on next page
1MRK505222-UUS C
Section 5
Differential protection
155
Technical reference manual
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