Name
Values (Range)
Unit
Step
Default
Description
OpenCTEnable
Disabled
Enabled
-
-
Enabled
Open CT detection feature. Open CTEnable
Off/On
tOCTAlarmDelay
0.100 - 10.000
s
0.001
1.000
Open CT: time in s to alarm after an open CT
is detected
tOCTResetDelay
0.100 - 10.000
s
0.001
0.250
Reset delay in s. After delay, diff. function is
activated
Table 75:
L6CPDIF (87L) Non group settings (basic)
Name
Values (Range)
Unit
Step
Default
Description
NoOfTerminals
2
3
4
5
6
-
-
2
Number of current terminals of the protected
circuit
Chan2IsLocal
No
Yes
-
-
No
2-nd local current connected to input channel
2, Yes/ No
IBase
50.0 - 9999.9
A
0.1
3000.0
Base (reference) current of the differential
protection
Table 76:
LT3CPDIF (87LT) 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
Table continues on next page
Section 5
1MRK505222-UUS C
Differential protection
154
Technical reference manual
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