ABB Relion 670 Series Technical Reference Manual page 158

Section 5
Differential protection
Name Values (Range)
OpenCTEnable Disabled
Enabled
tOCTAlarmDelay 0.100 - 10.000
tOCTResetDelay 0.100 - 10.000
Table 72: L3CPDIF (87L) Non group settings (basic)
Name Values (Range)
NoOfTerminals 2
3
Chan2IsLocal No
Yes
IBase 50.0 - 9999.9
Table 73: L6CPDIF (87L) Group settings (basic)
Name Values (Range)
Operation Disabled
Enabled
IdMin 0.20 - 2.00
IdMinHigh 0.20 - 10.00
tIdMinHigh 0.000 - 60.000
IdUnre 1.00 - 50.00
NegSeqDiffEn Disabled
Enabled
NegSeqROA 30.0 - 120.0
IMinNegSeq 0.01 - 0.20
CrossBlockEn No
Yes
I2/I1Ratio 5.0 - 100.0
I5/I1Ratio 5.0 - 100.0
ChargCurEnable Disabled
Enabled
AddDelay Disabled
Enabled
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Unit Step Default
- - Enabled
s 0.001 1.000
s 0.001 0.250
Unit Step Default
- - 2
- - No
A 0.1 3000.0
Unit Step Default
- - Disabled
IB 0.01 0.30
IB 0.01 0.80
s 0.001 1.000
IB 0.01 10.00
- - Enabled
Deg 1.0 60.0
IB 0.01 0.04
- - No
% 1.0 10.0
% 1.0 25.0
- - Disabled
- - Disabled
1MRK505222-UUS C
Description
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
Description
Disable/Enable Operation
Oper - restr charact., section 1 sensitivity,
multiple IBase
Initial lower sensitivity, as multiple of IBase
Time interval of initial lower sensitivity, in sec
Unrestrained differential current limit, multiple
of IBase
Off/On selection for internal / external fault
discriminator
Internal/external fault discriminator Operate
Angle, degrees
Min. value of neg. seq. curr. as multiple of
IBase
Off/On selection of the cross -block logic
Max. ratio of second harmonic to fundamental
harm dif. curr. in %
Max. ratio of fifth harmonic to fundamental
harm dif. curr. in %
Off/On selection for compensation of
charging currents
Off/On selection for delayed diff. trip command
Technical reference manual