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