Impedance Protection
Setting Values
Min. phase-current thresh 1 A @ 100 Irated 0.030 A to 100.000 A Increments of 0.001 A
5 A @ 100 Irated 0.15 A to 500.00 A Increments of 0.01 A
X reach (ph-g) = reach of
reactance, phase-to-
ground
For I
rated
= 1 A 0.100 Ω to 600.000 Ω Increments of 0.001 A
For I
rated
= 5 A 0.020 Ω to 120.000 Ω Increments of 0.001 A
X reach (ph-ph) = reach of
reactance, phase-to-phase
For I
rated
= 1 A 0.100 Ω to 600.000 Ω Increments of 0.001 A
For I
rated
= 5 A 0.020 Ω to 120.000 Ω Increments of 0.001 A
R reach (ph-g) = reach of
resistance, phase-to-
ground
For I
rated
= 1 A 0.100 Ω to 600.000 Ω Increments of 0.001 A
For I
rated
= 5 A 0.020 Ω to 120.000 Ω Increments of 0.001 A
R reach (ph-ph) = reach of
resistance, phase-to-
phase
For I
rated
= 1 A 0.100 Ω to 600.000 Ω Increments of 0.001 A
For I
rated
= 5 A 0.020 Ω to 120.000 Ω Increments of 0.001 A
Dropout Ratios
Currents About 0.95
Voltage About 1.05
Impedances About 1.05
Times
Operate time with time delay = 0 ms
Approx. 30 ms + OOT
70
at 50 Hz
Approx. 26 ms + OOT at 60 Hz
Dropout time Approx. 30 ms + OOT at 50 Hz
Approx. 26 ms + OOT at 60 Hz
Frequency Operating Range
0.9 ≤ f/f
rated
≤ 1.1 According to specified tolerances
10 Hz ≤ f < 0.9 f
rated
1.1 f
rated
< f ≤ 90 Hz
Slightly expanded tolerances
f < 10 Hz
f > 90 Hz
Active
Tolerances
Currents
1 % of the setting value or 5 mA (I
rated
= 1 A)
or 25 mA (I
rated
= 5 A), (f
rated
± 10 %)
Voltage 0.5 % of the setting value or 0.05 V
Impedances
Measurement tolerances for sinusoidal values
11.27
70
OOT (Output Operating Time) additional delay of the used output medium, such as 5 ms with quick-acting relay
Technical Data
11.27 Impedance Protection
SIPROTEC 5, Low-Impedance Busbar Protection, Manual 977
C53000-G5040-C019-C, Edition 04.2021
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