Siemens SIPROTEC 7SA6 Manual page 691

Distance protection relay for all voltage levels
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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:
t
(Type C)
Figure 10-1
Trip time characteristics of inverse time overcurrent protection, acc. IEC (phases and earth)
7SA6 Manual
C53000-G1176-C156
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 p
1
T
p
3.2
1.6
0.8
0.4
0.1 0.2
0.05
5
10
20
I/I
p
80
=
--------------------------- - T
[s]
p
2
(
)
I I
1
p
t
Trip time
T
Setting value time multiplier
p
Fault current
I
Setting value current
I
p
100
t [s]
30
20
10
5
3
2
1
0.5
0.3
0.2
0.1
0.05
1
2
3
Very inverse:
t
-------------------------- - T
=
(
I I
(Type B)
1000
t [s]
300
200
100
50
30
20
10
5
3
2
1
0.5
1
2
3
Longtime inverse:
t
Note: For earth fault read 3 I
stead of I
Technical Data
T
p
3.2
1.6
0.8
0.4
0.2
0.1
0.05
5
10
20
I/I
p
13.5
[s]
p
1
)
1
p
T
p
3.2
1.6
0.8
0.4
0.2
0.1
0.05
5
7
10
20
I/I
p
120
[s]
=
--------------------------- - T
p
1
(
)
I I
1
p
in-
0p
and T
instead of T
p
3I0p
p
10-23

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