ABB RET670 Applications Manual page 129

1MRK504116-UUS C
Table 39: T3WPDIF (87T) Group settings (basic)
Name Values (Range)
Operation Disabled
Enabled
SOTFMode Disabled
Enabled
tAlarmDelay 0.000 - 60.000
IDiffAlarm 0.05 - 1.00
IdMin 0.05 - 0.60
IdUnre 1.00 - 50.00
CrossBlockEn Disabled
Enabled
NegSeqDiffEn Disabled
Enabled
IMinNegSeq 0.02 - 0.20
NegSeqROA 30.0 - 120.0
Table 40: T3WPDIF (87T) Group settings (advanced)
Name Values (Range)
EndSection1 0.20 - 1.50
EndSection2 1.00 - 10.00
SlopeSection2 10.0 - 50.0
SlopeSection3 30.0 - 100.0
I2/I1Ratio 5.0 - 100.0
I5/I1Ratio 5.0 - 100.0
OpenCTEnable Disabled
Enabled
tOCTAlarmDelay 0.100 - 10.000
tOCTResetDelay 0.100 - 10.000
tOCTUnrstDelay 0.10 - 6000.00
Application manual
Unit Step Default
- - Disabled
- - Enabled
s 0.001 10.000
IB 0.01 0.20
IB 0.01 0.30
IB 0.01 10.00
- - Enabled
- - Enabled
IB 0.01 0.04
Deg 0.1 60.0
Unit Step Default
IB 0.01 1.25
IB 0.01 3.00
% 0.1 40.0
% 0.1 80.0
% 0.1 15.0
% 0.1 25.0
- - Disabled
s 0.001 3.000
s 0.001 0.250
s 0.01 10.00
IED application
Description
Operation Disable / Enable
Operation mode for switch onto fault feature
Time delay for diff currents alarm level
Dif. cur. alarm, multiple of base curr, usually
W1 curr.
Section1 sensitivity, multi. of base curr,
usually W1 curr.
Unrestr. prot. limit, multi. of base curr. usually
W1 curr.
Operation Off/On for cross-block logic
between phases
Operation Off/On for neg. seq. differential
protections
Neg. seq. curr. limit, mult. of base curr,
usually W1 curr.
Operate Angle for internal / external negative
sequence fault discriminator
Description
End of section 1, multi. of base current,
usually W1 curr.
End of section 2, multi. of base current,
usually W1 curr.
Slope in section 2 of operate-restrain
characteristic, in %
Slope in section 3 of operate-restrain
characteristic, in %
Max. ratio of second harmonic to fundamental
harm dif. curr. in %
Max. ratio of fifth harmonic to fundamental
harm dif. curr. in %
Open CT detection feature. Open CTEnable
Off/On
Open CT: time in s to alarm after an open CT
is detected
Reset delay in s. After delay, diff. function is
activated
Unrestrained diff. protection blocked after this
delay, in s
Section 3
123