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Name
Values (Range)
Unit
Step
Default
Description
IDiffAlarm
0.05 - 1.00
IB
0.01
0.20
Dif. cur. alarm, multiple of base curr,
usually W1 curr.
IdMin
0.10 - 0.60
IB
0.01
0.30
Section1 sensitivity, multi. of base curr,
usually W1 curr.
IdUnre
1.00 - 100.00
IB
0.01
10.00
Unrestr. prot. limit, multi. of base curr.
usually W1 curr.
CrossBlockEn
Disabled
Enabled
-
-
Enabled
Operation Off/On for cross-block logic
between phases
NegSeqDiffEn
Disabled
Enabled
-
-
Enabled
Operation Off/On for neg. seq. differential
protections
IMinNegSeq
0.02 - 0.20
IB
0.01
0.04
Neg. seq. curr. limit, mult. of base curr,
usually W1 curr.
NegSeqROA
30.0 - 120.0
Deg
0.1
60.0
Operate Angle for internal / external
negative sequence fault discriminator
Table 53: T3WPDIF (87T) Group settings (advanced)
Name
Values (Range)
Unit
Step
Default
Description
EndSection1
0.20 - 1.50
IB
0.01
1.25
End of section 1, multi. of base current,
usually W1 curr.
EndSection2
1.00 - 10.00
IB
0.01
3.00
End of section 2, multi. of base current,
usually W1 curr.
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
%
0.1
15.0
Max. ratio of second harmonic to
fundamental harm dif. curr. in %
I5/I1Ratio
5.0 - 100.0
%
0.1
25.0
Max. ratio of fifth harmonic to
fundamental harm dif. curr. in %
OpenCTEnable
Disabled
Enabled
-
-
Disabled
Open CT detection feature. Open CTEnable
Off/On
tOCTAlarmDelay
0.100 - 10.000
s
0.001
3.000
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
tOCTUnrstDelay
0.10 - 6000.00
s
0.01
10.00
Unrestrained diff. protection blocked after
this delay, in s
Table 54: T3WPDIF (87T) Non group settings (basic)
Name
Values (Range)
Unit
Step
Default
Description
GlobalBaseSelW1
1 - 12
-
1
1
Global base selector for winding 1
GlobalBaseSelW2
1 - 12
-
1
1
Global base selector for winding 2
GlobalBaseSelW3
1 - 12
-
1
1
Global base selector for winding 3
ConnectTypeW1
WYE (Y)
Delta (D)
-
-
WYE (Y)
Connection type of winding 1: Y-wye or D-
delta
Table continues on next page
1MRK 502 066-UUS B
Section 6
Differential protection
115
Technical manual
Summary of Contents for Relion 670 series
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