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Overcurrent Protection, Ground
Stage with Definite-Time Characteristic Curve
Setting Values
Method of measurement
Fundamental component
RMS value
–
Threshold value
44
1 A @ 50 and 100 Irated
0.010 A to 35.000 A
Increments of 0.001 A
5 A @ 50 and 100 Irated
0.05 A to 175.00 A
Increments of 0.01 A
1 A @ 1.6 Irated
0.001 A to 1.600 A
Increments of 0.001 A
5 A @ 1.6 Irated
0.002 A to 8.000 A
Increments of 0.001 A
Dropout ratio
0.90 to 0.99
Increments of 0.01
Time delay
0.00 s to 60.00 s
Increments of 0.01 s
Dropout delay
0.00 s to 60.00 s
Increments of 0.01 s
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
15 mA sec. (I
rated
= 1 A) or
75 mA sec. (I
rated
= 5 A)
Instrument current transformer
0.5 mA sec. (I
rated
= 1 A) or
2.5 mA sec. (I
rated
= 5 A)
Times
Operate time with time delay = 0 ms
Approx. 25 ms + OOT
45
at 50 Hz
Approx. 22 ms + OOT at 60 Hz
Extension of the operate time during operation with
transformer inrush-current detection
Approx. 10 ms
Dropout time
Approx. 20 ms + OOT
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
12.7
12.7.1
44
If you have selected the method of measurement = RMS value, do not set the threshold value under 0.1 l
rated,sec
.
45
OOT (Output Operating Time): additional delay of the output medium used, see chapter
Technical Data
12.7 Overcurrent Protection, Ground
816
SIPROTEC 5, Merging Unit 6MU85, Manual
C53000-G5040-C074-1, Edition 01.2020