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Technical Data
12.8 Directional Overcurrent Protection, Phases
Times
Operate time with time delay = 0 ms
Extension of the operate time during operation with
transformer inrush-current detection
Dropout time, typical
Dropout time, maximum
Frequency Operating Range
0.9 ≤ f/f
≤ 1.1
rated
10 Hz ≤ f < 0.9 f
1.1 f
< f ≤ 90 Hz
rated
f < 10 Hz
f > 90 Hz
Tolerances
Currents, method of measurement = fundamental
component
Currents, method of measurement = RMS value
(33 % harmonics, in relation to fundamental component)
Up to 30th harmonic
Up to 50th harmonic, f
Up to 50th harmonic, f
Time delay
Direction-determination angle error
Influencing Variables for Thresholds
Transient excess pickup in method of measurement =
fundamental component, for τ > 100 ms (with
complete unbalance)
Stage with Inverse-Time Characteristic Curve
12.8.2
Setting Values
Rotation angle of the reference voltage
Directional mode
Method of measurement
52
OOT (Output Operating Time): additional delay of the output medium used, for example 5 ms with fast relays
826
rated
= 50 Hz
rated
= 60 Hz
rated
52
Approx. 37 ms + OOT
at 50 Hz
Approx. 31 ms + OOT at 60 Hz
Approx. 10 ms
Approx. 25 ms + OOT
Approx. 30 ms + OOT
According to specified tolerances
Slightly expanded tolerances
Active
1 % of the setting value or 5 mA (I
or 25 mA (I
= 5 A), (f
rated
rated
1 % of the setting value or 5 mA (I
or 25 mA (I
= 5 A), (f
rated
rated
3 % of the setting value or 20 mA (I
or 100 mA (I
= 5 A), (f
rated
rated
4 % of the setting value or 20 mA (I
or 100 mA (I
= 5 A), (f
rated
rated
1 % of the setting value or 10 ms
1 °
< 5 %
-180° to +180°
Forward
Backward
Fundamental component
RMS value
SIPROTEC 5, Merging Unit 6MU85, Manual
C53000-G5040-C074-1, Edition 01.2020
= 1 A)
rated
± 10 %)
= 1 A)
rated
± 10 %)
= 1 A)
rated
± 10 %)
= 1 A)
rated
± 10 %)
Increments of 1°
–
–
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