Name Values (Range) Unit Step Default Description
IDiffAlarm 0.05 - 1.00 IB 0.01 0.20 Dif. cur. alarm, multiple of base curr,
usually W1 curr.
IdMin 0.10 - 0.60 IB 0.01 0.30 Section1 sensitivity, multi. of base curr,
usually W1 curr.
IdUnre 1.00 - 100.00 IB 0.01 10.00 Unrestr. prot. limit, multi. of base curr.
usually W1 curr.
CrossBlockEn Disabled
Enabled
- - Enabled Operation Off/On for cross-block logic
between phases
NegSeqDiffEn Disabled
Enabled
- - Enabled Operation Off/On for neg. seq. differential
protections
IMinNegSeq 0.02 - 0.20 IB 0.01 0.04 Neg. seq. curr. limit, mult. of base curr,
usually W1 curr.
NegSeqROA 30.0 - 120.0 Deg 0.1 60.0 Operate Angle for internal / external
negative sequence fault discriminator
Table 53: T3WPDIF (87T) Group settings (advanced)
Name Values (Range) Unit Step Default Description
EndSection1 0.20 - 1.50 IB 0.01 1.25 End of section 1, multi. of base current,
usually W1 curr.
EndSection2 1.00 - 10.00 IB 0.01 3.00 End of section 2, multi. of base current,
usually W1 curr.
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 %
I2/I1Ratio 5.0 - 100.0 % 0.1 15.0 Max. ratio of second harmonic to
fundamental harm dif. curr. in %
I5/I1Ratio 5.0 - 100.0 % 0.1 25.0 Max. ratio of fifth harmonic to
fundamental harm dif. curr. in %
OpenCTEnable Disabled
Enabled
- - Disabled Open CT detection feature. Open CTEnable
Off/On
tOCTAlarmDelay 0.100 - 10.000 s 0.001 3.000 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
tOCTUnrstDelay 0.10 - 6000.00 s 0.01 10.00 Unrestrained diff. protection blocked after
this delay, in s
Table 54: T3WPDIF (87T) Non group settings (basic)
Name
Values (Range) Unit Step Default Description
GlobalBaseSelW1 1 - 12 - 1 1 Global base selector for winding 1
GlobalBaseSelW2 1 - 12 - 1 1 Global base selector for winding 2
GlobalBaseSelW3 1 - 12 - 1 1 Global base selector for winding 3
ConnectTypeW1 WYE (Y)
Delta (D)
- - WYE (Y) Connection type of winding 1: Y-wye or D-
delta
Table continues on next page
1MRK 502 066-UUS B Section 6
Differential protection
115
Technical manual
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