Siemens siprotec 7SD5 User Manual page 537

Characteristic
Minimum current Iph>
Current in fault angle range Iϕ
Undervoltage phase-earth Uphe
(segregated for Iph>, Iϕ> and Iph>>)
Undervoltage phase-phase Uphph
(segregated for Iph>, Iϕ> and Iph>>)
Lower threshold angle ϕ>
Upper threshold angle ϕ<
Dropout to pickup ratio
Iph>, Iϕ>
Uphe, Uphph
Measuring tolerances for sinusoidal measured values
Values of U, I
Angle ϕ
Impedance starting (selectable)
Minimum current Iph>
The thresholds of the polygon set to the highest level are relevant taking into consideration the corresponding direction
Dropout/pickup ratio
Distance Measurement
Characteristic
Setting ranges of polygon:
I > = min. current, phases
Ph
X = reactance reach
R = resistance tolerance phase-phase
RE = resistance tolerance phase-earth
ϕ
= line angle
Line
ϕ
= angle of distance protection characteristic
Dist
α
= tilt angle for 1st zone
Pol
Direction determination for polygonal characteristic:
For all types of faults
Directional sensitivity
Each zone can be set to operate in forward or reverse direction, non-directional or ineffective.
Setting ranges of the MHO characteristic:
I > = min. current, phases
Ph
Z = impedance reach
r
7SD5 Manual
C53000-G1176-C169-1
Different stages with settable inclinations
for I = 1 A 0.10 A to 4.00 A
N
for I = 5 A 0.50 A to 20.00 A
N
for I = 1 A 0.10 A to 8.00 A
N
for I = 5 A 0.50 A to 40.00 A
N
20 V to 70 V
40 V to 130 V
30° to 60°
90° to 120°
Approx. 0.95
Approx. 1.05
± 5 %
± 3°
for I = 1 A 0.05 A to 4.00 A
N
for I = 5 A 0.25 A to 20.00 A
N
Approx. 1.05
Polygonal or MHO characteristic (depending on ordered vari-
ant); 5 independent zones and 1 controlled zone
for I = 1 A 0.05 A to 4.00 A
N
for I = 5 A 0.25 A to 20.00 A
N
= 1 A 0.050 Ω to 600,000 Ω
for I
N
= 5 A 0.010 Ω to 120,000 Ω
for I
N
= 1 A 0.050 Ω to 600,000 Ω
for I
N
= 5 A 0.010 Ω to 120,000 Ω
for I
N
= 1 A 0.050 Ω to 600,000 Ω
for I
N
= 5 A 0.010 Ω to 120,000 Ω
for I
N
30° to 89°
30° to 90°
0° to 30°
With phase-true, memorized or cross-polarized voltages
Dynamically unlimited
Stationary approx. 1V
for I = 1 A 0.05 A to 4.00 A
N
for I = 5 A 0.25 A to 20.00 A
N
= 1 A 0.050 Ω to 200,000 Ω
for I
N
= 5 A 0.010 Ω to 40,000 Ω
for I
N
4.5 Distance Protection (optional)
Increments 0.01 A
Increments 0.01 A
Increments 1 V
Increments 1 V
In increments of 1°
In increments of 1°
Increments 0.01 A
Increments 0.01 A
Increments 0.001 Ω
Increments 0.001 Ω
Increments 0.001 Ω
Increments 1°
Increments 1°
Increments 1°
Increments 0.01 A
Increments 0.001 Ω
537