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Table 67: GENPDIF (87G) Group settings (basic)
Name
Values (Range)
Unit
Step
Default
Description
Operation
Disabled
Enabled
-
-
Disabled
Operation Disabled/Enabled
IdMin
0.05 - 1.00
IB
0.01
0.25
Section 1 sensitivity, multiple of generator
rated current
IdUnre
1.00 - 50.00
IB
0.01
10.00
Unrestr. prot. limit, multiple of generator
rated current
OpNegSeqDiff
Disabled
Enabled
-
-
Enabled
Negative Sequence Differential Enable
Off/On
IMinNegSeq
0.02 - 0.20
IB
0.01
0.04
Neg. sequence curr. limit, as multiple of
gen. rated curr.
Table 68: GENPDIF (87G) Group settings (advanced)
Name
Values (Range)
Unit
Step
Default
Description
EndSection1
0.20 - 1.50
IB
0.01
1.25
End of section 1, multiple of generator
rated current
EndSection2
1.00 - 10.00
IB
0.01
3.00
End of section 2, multiple of generator
rated current
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 %
OpCrossBlock
Disabled
Enabled
-
-
Enabled
Operation Enable/ Disable for cross-block
logic between phases
NegSeqROA
30.0 - 120.0
Deg
0.1
60.0
Operate Angle of int/ext neg. seq. fault
discriminator, deg
HarmDistLimit
5.0 - 100.0
%
0.1
10.0
(Total) relative harmonic distorsion limit,
percent
TempIdMin
1.0 - 5.0
IdMin
0.1
2.0
Temp. Id pickup when input raisePickUp=1,
multiple of IdMin
AddTripDelay
0.000 - 60.000
s
0.001
0.100
Additional trip delay, when input
raisePickUp=1
OperDCBiasing
Disabled
Enabled
-
-
Disabled
Operation DC biasing On / Off
OpenCTEnable
Disabled
Enabled
-
-
Disabled
Enable/Disable open CT detection
tOCTAlarmDelay
0.100 - 10.000
s
0.001
1.000
Open CT: time to alarm if an open CT is
detected, in sec
tOCTResetDelay
0.100 - 10.000
s
0.001
0.250
Reset delay in s. After delay, diff. function
is activated
tOCTUnrstDelay
0.100 - 100.000
s
0.001
10.000
Unrestrained diff. protection blocked after
this delay, in s
Section 6
1MRK 502 066-UUS B
Differential protection
152
Technical manual
Summary of Contents for Relion 670 series
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