Siemens siprotec 7SA522 User Manual page 535

7SA522 Manual
C53000-G1176-C119-2
8
t/s
6
UÃ"DQ€h‘
4
2
UÃ"DQ€v
0
1 2
"DQ²A68UPS
t =
Logarithmic inverse:
Note: For currents I/,3
Figure 10-4 Trip time characteristics of inverse time overcurrent protection with logarithmic
inverse characteristic
3 4 5 6 7
⋅
T – T ln(I/3I0P)
3I0Pmax 3I0P
≥
35 the tripping time is constant.
Technical Data
1,70 1,35
10 20 30
UÃ"DQ
1,00
8
40
I/,3
10-19