Siemens siprotec 7SJ63 - Page 460

Technical Data
10-14 7SJ63 Manual
C53000-G1140-C120-1
Figure 10-1 Trip Characteristics of the Inverse-time Overcurrent Protection, as per IEC 60755–3 (phases and ground)
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 in seconds
T
p
setting value of the time factor
I fault current
I
p
settin
g
value of the pickup cur-
Note: For ground faults read I
Ep
stead of I
p
and T
Ep
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
Long Inverse:
T
p
t [s]
I / I
p
[s]
30
300
0.8
7
t
120
II
p
⁄()
1
1
–
----------------------------
T
p
⋅
=
1.6
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