ABB Relion 670 Series Technical Reference Manual page 162

Section 5
Differential protection
Name Values (Range)
b 0.01 - 1000.00
c 0.01 - 1000.00
OpenCTEnable Disabled
Enabled
tOCTAlarmDelay 0.100 - 10.000
tOCTResetDelay 0.100 - 10.000
Table 78: LT3CPDIF (87LT) Non group settings (basic)
Name Values (Range)
NoOfTerminals 2
3
Chan2IsLocal No
Yes
IBase 50.0 - 9999.9
ZerSeqCurSubtr Disabled
Enabled
TraAOnInpCh No Transf A
1
2
3
RatVoltW1TraA 1.0 - 9999.9
RatVoltW2TraA 1.0 - 9999.9
ClockNumTransA 0 [0 deg]
1 [30 deg lag]
2 [60 deg lag]
3 [90 deg lag]
4 [120 deg lag]
5 [150 deg lag]
6 [180 deg lag]
7 [210 deg lag]
8 [240 deg lag]
9 [270 deg lag]
10 [300 deg lag]
11 [330 deg lag]
ZerSeqPassTraA No
Yes
TraBOnInpCh No Transf B
1
2
3
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156
Unit Step Default
- 0.01 1.00
- 0.01 1.00
- - Enabled
s 0.001 1.000
s 0.001 0.250
Unit Step Default
- - 2
- - No
A 0.1 3000.0
- - Disabled
- - No Transf A
kV 0.1 130.0
kV 0.1 130.0
- - 0 [0 deg]
- - No
- - No Transf B
1MRK505222-UUS C
Description
Settable curve parameter, user-
programmable curve type.
Settable curve parameter, user-
programmable curve type.
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
Description
Number of current terminals of the protected
circuit
2-nd local current connected to input channel
2, Yes/ No
Base (reference) current of the differential
protection
Off/On for elimination of zero seq. from diff.
and bias curr
Power transformer A applied on input channel
X
Transformer A rated voltage (kV) on winding
1 (HV winding)
Transformer A rated voltage (kV) on winding
2 (LV winding)
Transf. A phase shift in multiples of 30 deg, 5
for 150 deg
Yes/No for capability of transf A to transform
zero seq curr
Power transformer B applied on input channel
X
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