Siemens siprotec 7SA6, Manual

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Technical Data
10-24
7SA6 Manual
C53000-G1176-C156
Figure 10-2 Trip time characteristics of inverse time overcurrent protection, acc. ANSI/IEEE, (phases and earth)
LONG INVERSE
MODERATELY INVERSE
D [s]
I
/
I
p
I
/
I
p
1
2
5
10
15
0.5
D [s]
1
2
5
10
15
0.5
1
0.3
0.1
1 2 3 5 10 20
100
20
10
0.5
0.2
0.05
t
8.9341
I I
p
⁄ ( )
2.0938
1 –
-------------------------------------- 0.17966 +
è ø
ç ÷
æ ö
D
⋅
= t
0.2663
I I
p
⁄ ( )
1.2969
1
–
--------------------------------------
0.03393
+
è ø
ç ÷
æ ö
D
⋅
=
1
0.3
0.1
1 2 3 5 10 20
100
20
10
5
2
0.5
0.2
0.05
INVERSE
SHORT INVERSE
D [s]
t [s]
t [s]
I
/
I
p
I
/
I
p
1
2
5
10
15
0.5
D [s]
1
2
5
10
15
0.5
1
0.3
0.1
1 2 3 5 10 20
100
20
10
5
2
0.5
0.2
0.05
t
0.0103
I I
p
⁄ ( )
0.02
1 –
--------------------------------- 0.0228 +
è ø
ç ÷
æ ö
D
⋅
=
[s]
[s]
[s]
1 2 3 5 10 20
0.3
0.1
100
20
10
2
0.05
5
3
5
[s] t
5.6143
I I
p
⁄ ( )
1
–
------------------------- 2.18592 +
è ø
æ ö
D
⋅
=
0.2
0.5
1
t [s] t [s]
2
3
50
50
0.07
0.7
3
7
30
30
7
3
0.7
0.07