Settings - ABB Relion Technical Manual

Section 6
Differential protection
6.1.2.4
Table 26: T3WPDIF (87T) Group settings (basic)
Name Values (Range)
Operation Disabled
Enabled
IdMin 0.10 - 0.60
EndSection1 0.20 - 1.50
EndSection2 1.00 - 10.00
SlopeSection2 10.0 - 50.0
SlopeSection3 30.0 - 100.0
IdUnre 1.00 - 50.00
I2/I1Ratio 5.0 - 100.0
I5/I1Ratio 5.0 - 100.0
CrossBlockEn Disabled
Enabled
NegSeqDiffEn Disabled
Enabled
IMinNegSeq 0.02 - 0.20
Table continues on next page
88
Name Type
PU_B BOOLEAN
PU_C BOOLEAN
BLK2H BOOLEAN
BLK5H BOOLEAN
BLKWAV BOOLEAN
IDALARM BOOLEAN
IDMAG_A REAL
IDMAG_B REAL
IDMAG_C REAL
IBIAS REAL
IDMAG_NS REAL

Settings

Unit Step
- -
IB 0.01
IB 0.01
IB 0.01
% 0.1
% 0.1
IB 0.01
% 0.1
% 0.1
- -
- -
IB 0.01
Description
Pickup signal from phase B
Pickup signal from phase C
General second harmonic block signal
General fifth harmonic block signal
General block signal from waveform criteria
General alarm for sustained differential currents
Magnitude of fundamental frequency differential
current, phase A
Magnitude of fundamental frequency differential
current, phase B
Magnitude of fundamental frequency differential
current, phase C
Magnitude of the bias current, which is common to all
phases
Magnitude of the negative sequence differential current
Default Description
Disabled Operation Disable / Enable
0.30 Section 1 sensitivity current, usually W1
current
1.25 End of section 1, multiple of W1 rated current
3.00 End of section 2, multiple of W1 rated current
40.0 Slope in section 2 of operate-restrain
characteristics
80.0 Slope in section 3 of operate-restrain
characteristics
10.00 Unrestrained protection limit, multiple of W1
rated current
15.0 Maximum ratio of 2nd harmonic to fundamental
harmonic differential current
25.0 Maximum ratio of 5th harmonic to fundamental
harmonic differential current
Enabled Operation Off/On for cross-block logic between
phases
Enabled Operation Off/On for negative sequence
differential function
0.04 Minimum negative sequence current
1MRK 502 048-UUS A
Technical manual