4.2 Distance Protection
445
7SA522 Manual
C53000-G1176-C155-3
Distance Measurement
Characteristic Polygonal or MHO circle; 5 independent and 1 controlled zone
Setting ranges polygon:
I
Ph
> = min. current, phases for I
N
= 1 A 0.05 A to 4.00 A Increments 0.01 A
for I
N
= 5 A 0.25 A to 20.00 A
X = reactance reach for I
N
= 1 A 0.050 Ω up to 600.000Ω Increments 0.001 Ω
for I
N
= 5 A 0.010 Ω up to 120.000Ω
R = resistance tolerance phase-phase for I
N
= 1 A 0.050 Ω up to 600.000Ω Increments 0.001 Ω
for I
N
= 5 A 0.010 Ω up to 120.000Ω
RE = resistance tolerance phase-earth for I
N
= 1 A 0.050 Ω up to 600.000Ω Increments 0.001 Ω
for I
N
= 5 A 0.010 Ω up to 120.000Ω
Ï•
Line
= line angle 30° to 89° In increments of 1°
Ï•
Dist
= angle of distance protection characteristic 30° to 90° In increments of 1°
α
Pol
= tilt angle for 1st zone 0° to 30° In increments of 1°
Direction determination for polygonal characteristic:
For all types of faults With phase-true, memorized or cross-polarized voltages
Directional sensitivity Dynamically unlimited
stationary approx. 1V
Each zone can be set to operate in forward or reverse direction, non-directional or ineffective.
Setting ranges MHO–circle:
I
Ph
> = min. current, phases for I
N
= 1 A 0.05 A to 4.00 A Increments 0.01 A
for I
N
= 5 A 0.25 A to 20.00 A
Z
r
= impedance range for I
N
= 1 A 0.050 Ω up to 200.000Ω Increments 0.001 Ω
for I
N
= 5 A 0.010 Ω up to 40.000Ω
Ï•
Line
= line angle 30° to 89° In increments of 1°
Ï•
Dist
= angle of distance protection characteristic 30° to 90° Increments 1°
Polarization With memorized or cross-polarized voltages
Each zone can be set to operate in forward or reverse direction, non-directional or ineffective.
Load trapezoid:
R
load
= minimum load resistance for I
N
= 1 A 0.050 Ω to 600.000 Ω; ∞ Increments 0.001 Ω
for I
N
= 5 A 0.010 Ω to 120.000 Ω; ∞
Ï•
load
= maximum load angle 20° to 60° In increments of 1°
Drop-off to pick-up ratio
– currents Approx. 0.95
– impedances Approx. 1.06
Measured value correction Mutual impedance matching for parallel lines (ordering option)
Measuring tolerances for sinusoidal measured values
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