ABB RED650 - Page 97

Name Values (Range) Unit Step Default Description
k 0.05 - 1.10 - 0.01 1.00 Time Multiplier Setting (TMS) for inverse
delays
IdiffAlarm 0.05 - 1.00 IB 0.01 0.15 Sustained differential current alarm,
factor of IBase
tAlarmdelay 0.000 - 60.000 s 0.001 10.000 Delay for alarm due to sustained
differential current, in s
Table 37: LT3CPDIF Group settings (advanced)
Name Values (Range) Unit Step Default Description
EndSection1 0.20 - 1.50 IB 0.01 1.25 End of section 1, as multiple of reference
current IBase
EndSection2 1.00 - 10.00 IB 0.01 3.00 End of section 2, as multiple of reference
current IBase
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 % 1.0 10.0 Max. ratio of 2nd harm. to fundamental
harm dif. curr. in %
I5/I1Ratio 5.0 - 100.0 % 1.0 25.0 Max. ratio of 5th harm. to fundamental
harm dif. curr. in %
p 0.01 - 1000.00 - 0.01 0.02 Settable curve parameter, user-
programmable curve type.
a 0.01 - 1000.00 - 0.01 0.14 Settable curve parameter, user-
programmable curve type.
b 0.01 - 1000.00 - 0.01 1.00 Settable curve parameter, user-
programmable curve type.
c 0.01 - 1000.00 - 0.01 1.00 Settable curve parameter, user-
programmable curve type.
OpenCTEnable Off
On
- - On Open CTEnable Off/On
tOCTAlarmDelay 0.100 - 10.000 s 0.001 1.000 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
OCTBlockEn Off
On
- - On Enable Open CT blocking function trip
Off/On
Table 38: LT3CPDIF Non group settings (basic)
Name
Values (Range) Unit Step Default Description
GlobalBaseSel 1 - 12 - 1 1 Selection of one of the Global Base
Value groups
NoOfUsedCTs 2
3
- - 2 Total number of 3-Ph CT sets connected
to diff protection
ZerSeqCurSubtr Off
On
- - Off Off/On for elimination of zero seq. from
diff. and bias curr
Table continues on next page
1MRK 505 394-UEN A Section 6
Differential protection
Line differential protection RED650 2.2 IEC 91
Technical manual