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
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