Table 69:
LDLPDIF (87L) Output signals
Name
Type
Description
TRIP
BOOLEAN
General trip from differential protection system
TR_A
BOOLEAN
Trip signal from phase A
TR_B
BOOLEAN
Trip signal from phase B
TR_C
BOOLEAN
Trip signal from phase C
TRLOCAL
BOOLEAN
Trip from local differential function
TRLOC_A
BOOLEAN
Trip from local differential function in phase A
TRLOC_B
BOOLEAN
Trip from local differential function in phase B
TRLOC_C
BOOLEAN
Trip from local differential function in phase C
TRREMOTE
BOOLEAN
Trip from remote differential function
DIFLBLKD
BOOLEAN
Local line differential function blocked
5.1.5
Setting parameters
Table 70:
L3CPDIF (87L) Group settings (basic)
Name
Values (Range)
Unit
Step
Default
Description
Operation
Disabled
Enabled
-
-
Disabled
Disable/Enable Operation
IdMin
0.20 - 2.00
IB
0.01
0.30
Oper - restr charact., section 1 sensitivity,
multiple IBase
IdMinHigh
0.20 - 10.00
IB
0.01
0.80
Initial lower sensitivity, as multiple of IBase
tIdMinHigh
0.000 - 60.000
s
0.001
1.000
Time interval of initial lower sensitivity, in sec
IdUnre
1.00 - 50.00
IB
0.01
10.00
Unrestrained differential current limit, multiple
of IBase
NegSeqDiffEn
Disabled
Enabled
-
-
Enabled
Off/On selection for internal / external fault
discriminator
NegSeqROA
30.0 - 120.0
Deg
1.0
60.0
Internal/external fault discriminator Operate
Angle, degrees
IMinNegSeq
0.01 - 0.20
IB
0.01
0.04
Min. value of neg. seq. curr. as multiple of
IBase
CrossBlockEn
No
Yes
-
-
No
Off/On selection of the cross -block logic
ChargCurEnable
Disabled
Enabled
-
-
Disabled
Off/On selection for compensation of
charging currents
AddDelay
Disabled
Enabled
-
-
Disabled
Off/On selection for delayed diff. trip command
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
Table continues on next page
Section 5
1MRK505222-UUS C
Differential protection
150
Technical reference manual
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