Siemens siprotec 7SA522 - Page 533

Technical Data
10-177SA522 Manual
C53000-G1176-C119-2
Figure 10-2 Trip time characteristics of inverse time overcurrent protection, acc. ANSI/IEEE, (phases and earth)
LONG INVERSE
MODERATELY INVERSE
D [s]
I / I
p
I / I
p
1
2
5
10
15
0.5
D [s]
1
2
5
10
15
0.5
1
0.3
0.1
1 2 3 5 10 20
100
20
10
0.5
0.2
0.05
t
8.9341
II
p
⁄()
2.0938
1
–
--------------------------------------
0.17966
+



D⋅
=
t
0.2663
II
p
⁄()
1.2969
1
–
--------------------------------------
0.03393
+



D⋅
=
1
0.3
0.1
1 2 3 5 10 20
100
20
10
5
2
0.5
0.2
0.05
INVERSE
SHORT INVERSE
D [s]
t [s]
t [s]
I / I
p
I / I
p
1
2
5
10
15
0.5
D [s]
1
2
5
10
15
0.5
1
0.3
0.1
1 2 3 5 10 20
100
20
10
5
2
0.5
0.2
0.05
t
0.0103
II
p
⁄()
0.02
1
–
---------------------------------
0.0228
+



D⋅
=
[s]
[s]
[s]
1 2 3 5 10 20
0.3
0.1
100
20
10
2
0.05
5
3
5
[s]
t
5.6143
II
p
⁄()1
–
-------------------------
2.18592
+


D⋅
=
0.2
0.5
1
t [s]t [s]
2
3
50
50
0.07
0.7
3
7
30
30
7
3
0.7
0.07