Siemens siprotec 7SA6 User Manual page 641

Distance
Measurement
7SA6 Manual
C53000-G1176-C133-1
Voltage and angle-dependent current pickup (U/I/ϕ)
Characteristic
Minimum current Iph>
Current in fault angle range Iϕ>
Undervoltage phase–earth Uphe
Undervoltage phase–phase Uphph
(segregated for Iph> and Iϕ> and Iph>>)
Lower threshold angle ϕ>
Upper threshold angle ϕ<
Drop-off to pick-up ratio
Iph>, Iϕ>,
Uphe, Uphph
Measuring tolerances for sinusoidal
measured values
values of U, I
angles ϕ
Impedance starting
Minimum current Iph>
The thresholds of the polygon set to the highest level are relevant taking into consid-
eration the corresponding direction
Drop-off to pick-up ratio
*) Secondary values based on I
Characteristic
Setting ranges polygon:
I > = min. current, phases
Ph
X = reactance reach
= resistance tolerance phase–phase0.05 Ω to 250.00 Ω
R
RE = resistance tolerance phase–earth 0.05 Ω to 250.00 Ω
ϕ
= line angle
Line
α
= tilt angle for 1st zone
Pol
Direction determination for polygonal characteristic:
for all types of fault
Each zone can be set to forward, reverse or non-directional
Load trapezoid:
R = minimum load resistance
load
ϕ
= maximum load angle
load
Drop-off to pick-up ratios
Measured value correction
different steps with settable inclinations
0.10 A to 4.00 A
0.10 A to 2.00 A
20 V to 70 V (steps 1 V)
40 V to 130 V (steps 1 V)
30° to 60°
90° to 120° (steps 1°)
approx. 0.95
approx. 1.05
± 5 %
± 3°
0.10 A to 4.00 A
approx. 1.05
= 1 A; for I = 5 A they must be multiplied with 5.
N N
polygonal
5 independent and 1 controlled zone
0.10 A to 4.00 A
0.05 Ω to 250.00 Ω
30° to 89°
0° to 30°
with phase-true, memorizedor quadrature
voltages
0.10 Ω to 250.00 Ω
20° to 60°
approx. 1.06
mutual impedance matching for parallel
lines (ordering option)
Technical Data
1
) (steps 0.01 A)
1
) (steps 0.01 A)
(steps 1°)
1
) (steps 0.01 A)
1)
(steps 0.01·A)
(steps 0.01 Ω)
2)
(steps 0.01 Ω)
2)
2) (steps 0.01 Ω)
(steps 1°)
(steps 1°)
; ∞ (steps 0.01 Ω)
2)
(steps 1°)
10-13