Siemens SIPROTEC 7UM62, Manual

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4 Technical Data
408
7UM62 Manual
C53000-G1176-C149-3
Figure 4-1 Trip Characteristics of the Inverse-time Overcurrent Protection, as per IEC 60755–3 (Phases and Ground)
Extremely Inverse:
(Type C)
[s]
t
80
I I
p
⁄ ( )
2
1 –
---------------------------- T
p
⋅
=
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 ,
I I
p
⁄ ( )
0 02
,
1 –
-------------------------------------- T
p
⋅
=
(Type A)
t
13 5
,
I I
p
⁄ ( )
1
1 –
---------------------------- T
p
⋅
=
t
80
I I
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
Setting value of the pickup current