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4 Technical Data
418
I
diff
-------- -
10
I
N
9
8
2031
I DIFF>>
7
6
5
4
3
2
b
1
a
2021
I DIFF>
1
2
3
BASE POINT 2
BASE POINT 1
Figure 4-6 Pickup Characteristic for Generator or Motor Differential Protection
I
Xf
2
(settable)
I
>>/I
DIFF
N
1
Setting value e.g. 0.1
0.6
0.4
0.3
0.2
0.1
Blocking
0.05
0
10
20
Figure 4-7 Influence of Frequency in Generator or Motor Differential Protection
Fault characteristic
Tripping
Add-On Stabilization
4
5
6
7
8
9
Tripping
Legend:
I
DIFF
I
fN
I
Xf
30
40
50
Blocking
SLOPE 2
c
SLOPE 1
10 11 12 13 14 15 16 17 18
Differential current = | I
+ I
1
2
Current at system frequency
Current at any frequency
within specified range
60
70
80
C53000-G1176-C149-3
d
I
stab
----------- -
I
N
|
f/Hz
7UM62 Manual
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