Siemens SIPROTEC 7SJ62 - Page 447

Technical Data
10-297SJ62 Manual
C53000-G1140-C121-1
Figure 10-6 Trip Time Characteristic Curves For The Thermal Overload Protection (49)
W
illi Anwender
1
0.3
0.1
1 2 3 5 10 12
100
20
10
5
2
0.5
0.2
0.05
t [min]
t [min]
I /k · I
N
1000
1
0.3
0.1
100
20
10
5
2
0.5
0.2
0.05
[min]
3
30
30
3
Parameter:
Setting Value
of Time Con-
stant
20
200
500
100
50
10
5
2
1
4 6 7 8
50
t τ
I
k I
N
⋅
--------------


2
I
k I
N
⋅
--------------


2
1–
--------------------------------
ln ⋅=
without pre-load:
I /k · I
N
1 2 3 5 10 12 4 6 7 8
with 90 % pre-load:
t τ
I
k I
N
⋅
--------------


2
I
pre
k I
N
⋅
--------------



2
–
I
k I
N
⋅
--------------


2
1–
---------------------------------------------------
ln ⋅=
50
Parameter:
Setting Value
of Time Con-
stant
1000
500
200
100
50
20
10
5
2
1
τ [min]
τ [min]
[min]
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