ABB RET670 - Page 129

Table 39: T3WPDIF (87T) Group settings (basic)
Name Values (Range) Unit Step Default Description
Operation Disabled
Enabled
- - Disabled Operation Disable / Enable
SOTFMode Disabled
Enabled
- - Enabled Operation mode for switch onto fault feature
tAlarmDelay 0.000 - 60.000 s 0.001 10.000 Time delay for diff currents alarm level
IDiffAlarm 0.05 - 1.00 IB 0.01 0.20 Dif. cur. alarm, multiple of base curr, usually
W1 curr.
IdMin 0.05 - 0.60 IB 0.01 0.30 Section1 sensitivity, multi. of base curr,
usually W1 curr.
IdUnre 1.00 - 50.00 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 40: 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
1MRK504116-UUS C Section 3
IED application
123
Application manual