High-Current Switch-On-To-Fault Protection; Earth Fault Detection In A Non-Earthed System - Siemens siprotec 7SA6 User Manual

Technical Data

10.10 High-Current Switch-On-To-Fault Protection

Pick-up
Times

10.11 Earth Fault Detection in a Non-Earthed System

Pickup/
Trip
Phase
Determination
Direction
Determination
10-28
High current pick-up
Drop-off to pick-up ratio
Pick-up tolerance
Shortest tripping time
Displacement voltage
Time delay
Optional trip with
additional time delay
Measuring tolerance
Time tolerance
Pick-up time
Drop-off time
The set times are pure delay times.
Measuring principle
Earth fault phase
Healthy phases
Messtoleranz
Measuring principle
Pick-up value
Angle correction for cable core
balance current transformer
Measuring tolerance
2
) Sensitive earth current input independent from I
I>>> 1.00 A to 25.00 A
approx. 0.90
≤ 3 % of set value or 1% of I
approx. 13 ms
3U > 1 V to 150 V
0
T 0.00 s to 320.00 s
Sens.E/F
T 0.00 s to 320.00 s
Sens.E/F TRIP
5 % of set value
1 % of set value or 10 ms
min. 32 ms
26 ms
voltage measurement phase-earth
U 10 V to 100 V
ph min
U 10 V to 100 V
ph max
5 % of set value
active / reactive power measurement
I> 0.003 A to 1.000 A
Sens.E/F
0.0° to 5.0°
in 2 steps
10 % of set value
for tan ϕ ≤ 20 (for active power)
.
N
1
) (steps 0.01 A)
N
(steps 1 V)
(steps 0.01 s)
(steps 0.01 s)
(steps 1 V)
(steps 1 V)
2
) (steps 0.001 A)
(steps 0.1°)
7SA6 Manual
C53000-G1176-C133-1