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 80: LT6CPDIF (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 %
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.
b 0.01 - 1000.00 - 0.01 1.00 Settable curve parameter, user-
programmable curve type.
c 0.01 - 1000.00 - 0.01 1.00 Settable curve parameter, user-
programmable curve type.
Table continues on next page
Section 5 1MRK505222-UUS C
Differential protection
158
Technical reference manual
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