Siemens Siprotec 7UM62 Manual page 424

4 Technical Data
100
t [s]
30
20
10
5
3
2
1
0.5
0.3
0.2
0.1
0.05
1 2 3
Normal inverse:
t =
(Type A)
100
t [s]
20
10
5
3
2
1
0.5
0.3
0.2
0.1
0.05
1 2 3
Extremely Inverse:
Extremely inverse:
t
(Type C)
(Type C)
Figure 4-1 Trip Characteristics of the Inverse-time Overcurrent Protection, as per IEC 60755–3 (Phases and Ground)
408
T
p
3.2
1.6
0.8
0.4
0.2
0.1
0.05
5 7 10 20
I/I p
0 14 ,
⋅
------------------------------------- - T [s]
,
p
0 02
( ⁄ )
I I 1
–
p
T
p
3.2
1.6
0.8
0.4
0.1 0.2
0.05
5
10 20
I/I p
80
⋅
80
t --------------------------- - T [s]
=
⋅
--------------------------- - T
= [s]
p
2
p
2 ( ⁄ )
I I 1
–
( ⁄ )
I I – 1
p
p
100
t [s]
30
20
10
5
3
2
1
0.5
0.3
0.2
0.1
0.05
1 2 3 5
Very inverse:
t --------------------------- - T
=
( ⁄
(Type B)
I I
t Trip time in seconds
T Setting value of the time factor
p
Fault current
I
Setting value of the pickup current
I
p
T
p
3.2
1.6
0.8
0.4
0.2
0.1
0.05
10 20
I/I p
,
13 5
⋅
[s]
p
1
)
1
–
p
7UM62 Manual
C53000-G1176-C149-3