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12.9
Directional Overcurrent Protection, Ground
Stage with Definite-Time Characteristic Curve
12.9.1
Setting Values for the Function Direction Determination
Method for direction determination
Minimum V0 or V2 threshold
Rotation angle of the reference voltage
Forward range
Setting Values
Direction mode
Method of measurement
Threshold value
Dropout ratio
Operate delay
Dropout delay
Dropout
The greater dropout differential (= | pickup value – dropout value |) of the following 2 criteria
applies:
Dropout differential derived from the parameter Dropout ratio
If this parameter is not available, a dropout ratio of 95 % applies for overcurrent and of 105 % for undercur-
rent functionality.
Minimum absolute dropout differential
Protection-class current transformer
Instrument current transformer
Times
The maximum pickup time with operate delay = 0 ms Approx. 30 ms + OOT at 50 Hz
Extension of the operate time during operation with
inrush-current detection
Dropout time
SIPROTEC 5, Merging Unit 6MU85, Manual
C53000-G5040-C074-1, Edition 01.2020
1 A @ 50 and 100 Irated
5 A @ 50 and 100 Irated
1 A @ 1.6 Irated
5 A @ 1.6 Irated
12.9 Directional Overcurrent Protection, Ground
Zero sequence
Negative sequence
0.150 V to 20.000 V
-180° to 180°
0° to 180°
Forward
Reverse
Fundamental component
RMS value
0.030 A to 35.000 A
0.15 A to 175.00 A
0.001 A to 1.600 A
0.005 A to 8.000 A
0.90 to 0.99
0.00 s to 60.00 s
0.00 s to 60.00 s
15 mA sec. (I
= 1 A) or
rated
75 mA sec. (I
= 5 A)
rated
0.5 mA sec. (I
= 1 A) or
rated
2.5 mA sec. (I
= 5 A)
rated
Approx. 25 ms + OOT at 60 Hz
Approx. 10 ms
Approx. 20 ms + OOT
Technical Data
–
0.001 V
1°
1°
–
–
Increments of 0.001 A
Increments of 0.01 A
Increments of 0.001 A
Increments of 0.001 A
Increments of 0.01
Increments of 0.01 s
Increments of 0.01 s
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