Earth Fault Protection Teleprotection Schemes; Weak-Infeed Tripping - Siemens siprotec 7SA6 User Manual

10.6

Earth Fault Protection Teleprotection Schemes

Mode
Comparison
Schemes
10.7

Weak-Infeed Tripping

Operation method
Undervoltage
Detection
Times
7SA6 Manual
C53000-G1176-C133-1
For two line ends
For three line ends
Schemes
Application
Send signal prolongation
Release signal prolongation
Transient blocking time
Waiting time for transient blocking
Echo delay time
Echo impulse duration
Time expiry tolerances
The set times are pure delay times
Phase segregated undervoltage detection after reception of a carrier signal from the
remote end
Setting value
Drop-off to pick-up ratio
Pick-up tolerances
Release delay
Release prolongation
Time expiry tolerances
with one channel for each direction
with three channels for each direction
with one channel for each direction and
oposite line end
directional comparison pickup scheme
directional unblocking scheme
directional blocking scheme
2-terminal lines
3-terminal lines
multi-terminal lines via CFC
0.00 s to 30.00 s
0.000 s to 30.000 s
0.00 s to 30.00 s
0.00 s to 30.00 s; ∞
0.00 s to 30.00 s
0.00 s to30.00 s
1 % of set value or 10 ms
.
U < 2 V to 70 V
PhE
approx. 1.05
≤ 5 % of set value or 0.5 V
0.00 s to 30.00 s
0.00 s to 30.00 s
1 % of set value or 10 ms
Technical Data
(steps 0.01 s)
(steps 0.001 s)
(steps 0.01 s)
(steps 0.01 s)
(steps 0.01 s)
(steps 0.01 s)
(steps 1 V)
(steps 0.01 s)
(steps 0.01 s)
10-23