Siemens siprotec 7SA6 - Page 650

Technical Data
10-22 7SA6 Manual
C53000-G1176-C133-1
Logarithmic inverse:
Note: For currents I/,3 ≥ 35 the tripping time is constant.
Figure 10-4 Trip time characteristics of inverse time overcurrent protection with logarithmic
inverse characteristic
Figure 10-5 Trip time characteristics of the zero sequence voltage protection U
0inv.
1 2 3 4 5 6 7 10 20 30 40
0
2
4
6
8
I/,3
t/s
7,3PD[
7,3PLQ
,3²)$&725
7,3
1.00
1.351.70
8
tT
3I0Pmax
T
3I0P
ln(I/3I0P)⋅
–=
0 20 40 60 80 100 120 140
0.1
0.2
0.3
0.4
0.5
0.7
1
2
3
4
5
10
t/s
3U
0
/V
1V 2V 3V 4V 5V
U
0
inverse: with U
0min
= parameter 8LQYPLQLPXP (Adr.  )
t
2s
0,25 U
0
V⁄ U
0min
V⁄
–
-------------------------------------------------------------=
Parameter:
8LQYPLQL
PXP