Siemens siprotec 7SA6 User Manual page 650

Technical Data
10-22
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
10
1 V 2 V
t/s
5
4
3
2
1
0.7
0.5
0.4
0.3
0.2
0.1
0 20
t = ------------------------------------------------------------ -
U inverse:
0
0,25 U
0
Figure 10-5 Trip time characteristics of the zero sequence voltage protection U
3 4 5 6 7
⋅
T – T ln(I/3I0P)
3I0Pmax 3I0P
≥
35 the tripping time is constant.
3 V 4 V 5 V
40 60 80
2 s
with U
⁄ ⁄
0min
V U V
–
0min
1.70 1.35
10 20 30
Parameter:
Vv‰Àvv
€ˆ€
100 120
Vv‰Àvv€ˆ€
= parameter
C53000-G1176-C133-1
UÃ"DQ
1.00
8
40
I/,3
3U /V
140
0

(Adr. )
0inv.
7SA6 Manual