Name
Type
Description
PU_B
BOOLEAN
Pickup signal from phase B
PU_C
BOOLEAN
Pickup signal from phase C
BLK2H
BOOLEAN
General second harmonic block signal
BLK5H
BOOLEAN
General fifth harmonic block signal
BLKWAV
BOOLEAN
General block signal from waveform criteria
IDALARM
BOOLEAN
General alarm for sustained differential currents
IDMAG_A
REAL
Magnitude of fundamental frequency differential
current, phase A
IDMAG_B
REAL
Magnitude of fundamental frequency differential
current, phase B
IDMAG_C
REAL
Magnitude of fundamental frequency differential
current, phase C
IBIAS
REAL
Magnitude of the bias current, which is common to all
phases
IDMAG_NS
REAL
Magnitude of the negative sequence differential current
6.1.2.4
Settings
Table 26:
T3WPDIF (87T) Group settings (basic)
Name
Values (Range)
Unit
Step
Default
Description
Operation
Disabled
Enabled
-
-
Disabled
Operation Disable / Enable
IdMin
0.10 - 0.60
IB
0.01
0.30
Section 1 sensitivity current, usually W1
current
EndSection1
0.20 - 1.50
IB
0.01
1.25
End of section 1, multiple of W1 rated current
EndSection2
1.00 - 10.00
IB
0.01
3.00
End of section 2, multiple of W1 rated current
SlopeSection2
10.0 - 50.0
%
0.1
40.0
Slope in section 2 of operate-restrain
characteristics
SlopeSection3
30.0 - 100.0
%
0.1
80.0
Slope in section 3 of operate-restrain
characteristics
IdUnre
1.00 - 50.00
IB
0.01
10.00
Unrestrained protection limit, multiple of W1
rated current
I2/I1Ratio
5.0 - 100.0
%
0.1
15.0
Maximum ratio of 2nd harmonic to fundamental
harmonic differential current
I5/I1Ratio
5.0 - 100.0
%
0.1
25.0
Maximum ratio of 5th harmonic to fundamental
harmonic differential current
CrossBlockEn
Disabled
Enabled
-
-
Enabled
Operation Off/On for cross-block logic between
phases
NegSeqDiffEn
Disabled
Enabled
-
-
Enabled
Operation Off/On for negative sequence
differential function
IMinNegSeq
0.02 - 0.20
IB
0.01
0.04
Minimum negative sequence current
Table continues on next page
Section 6
1MRK 502 048-UUS A
Differential protection
88
Technical manual
Summary of Contents for 650 series
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