Siemens siprotec 7SA522 - Page 532

Technical Data
10-16 7SA522 Manual
C53000-G1176-C119-2
Figure 10-1 Trip time characteristics of inverse time overcurrent protection, acc. IEC (phases and earth)
0.1
0.2
0.4
1.6
3.2
0.05
Extremely inverse:
(Type C)
I / I
p
1
0.3
0.1
1 2 3 5 10 20
100
20
10
5
2
0.5
0.2
0.05
Normal inverse:
Very inverse:
(Type B)
T
p
t [s]
t [s]
I / I
p
I / I
p
1
0.3
0.1
1 2 3 5 10 20
100
20
10
5
2
0.5
0.2
0.05
[s]
[s]
1 2 3
5
10 20
0.3
0.1
100
20
10
2
0.05
5
[s]
0.2
0.5
1
t [s]
3
3
30
30
3
t
0.14
II
p
⁄()
0.02
1
–
---------------------------------
T
p
⋅
=
(Type A)
t
13.5
II
p
⁄()
1
1
–
---------------------------
T
p
⋅
=
t
80
II
p
⁄()
2
1
–
----------------------------
T
p
⋅
=
0.8
0.1
0.2
0.4
1.6
3.2
0,05
0.8
7
T
p
0.1
0.2
0.4
1.6
3.2
0.8
T
p
0.05
t Trip time
T
p
Setting value time multiplier
I Fault current
I
p
Setting value current
Note: For earth fault read 3I
0p
in-
stead of I
p
and T
3I0p
instead of T
p
0.1
0.2
0.4
3.2
0.05
10
3
1
1 2 3 5 10 20
1000
200
100
50
20
5
2
0.5
Longtime inverse:
T
p
t [s]
I / I
p
[s]
30
300
0.8
7
t
120
II
p
⁄()
1
1
–
----------------------------
T
p
⋅
=
1.6