Name
Values (Range)
Unit
Step
Default
Description
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
Off
On
-
-
On
Operation Off/On for cross-block logic
between phases
NegSeqDiffEn
Off
On
-
-
On
Operation Off/On for negative sequence
differential protections
IMinNegSeq
0.02 - 0.20
IB
0.01
0.04
Minimum negative sequence current
NegSeqROA
30.0 - 90.0
Deg
0.1
60.0
Operate angle for internal/external
negative sequence fault discriminator
SOTFMode
Off
On
-
-
On
Operation mode for switch onto fault
IDiffAlarm
0.05 - 1.00
IB
0.01
0.20
Differential curreent alarm, multiple of
base current, usually W1 current
tAlarmDelay
0.000 - 60.000
s
0.001
10.000
Time delay for differential current alarm
Table 27:
T2WPDIF Non group settings (basic)
Name
Values (Range)
Unit
Step
Default
Description
GlobalBaseSelW1
1 - 6
-
1
1
Selection of one of the Global Base Value
groups, winding 1
GlobalBaseSelW2
1 - 6
-
1
1
Selection of one of the Global Base Value
groups, winding 2
ConnectTypeW1
WYE (Y)
Delta (D)
-
-
WYE (Y)
Connection type of winding 1: Y-wye or D-
delta
ConnectTypeW2
WYE (Y)
Delta (D)
-
-
WYE (Y)
Connection type of winding 2: Y-wye or D-
delta
ClockNumberW2
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]
7 [150 deg lead]
8 [120 deg lead]
9 [90 deg lead]
10 [60 deg lead]
11 [30 deg lead]
-
-
0 [0 deg]
Phase displacement between W2 &
W1=HV winding, hour notation
ZSCurrSubtrW1
Off
On
-
-
On
Enable zero sequence subtration for W1
side, Off/On
ZSCurrSubtrW2
Off
On
-
-
On
Enable zero sequence subtration for W2
side, Off/On
Section 6
1MRK 504 135-UEN A
Differential protection
82
Technical manual
Summary of Contents for ret650
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