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12.11
Inrush-Current Detection
Setting Values
Operating limit I
Content 2nd harmonic
Duration of the crossblock function
Times
Operating times
Pickup
Harmonic: I
2nd harm
Dropout
The greater dropout differential (= | pickup threshold – dropout threshold |) of the following
criteria is used:
Dropout differential derived from the parameter Dropout ratio
If this parameter is not available, a dropout ratio of 95 % applies for the overcurrent protection and a dropout
ratio of 105 % applies for the undercurrent protection.
Minimum absolute dropout differential
Protection-class current transformers
Instrument transformers
Harmonic: I
2nd harm
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
SIPROTEC 5, Merging Unit 6MU85, Manual
C53000-G5040-C074-1, Edition 01.2020
max
/I
1st harm
/I
1st harm
rated
0.030 A to 35.000 A
at I
= 1 A
rated
0.15 A to 175.00 A
at I
= 5 A
rated
10% to 45%
0.03 s to 200.00 s
Approx. 29 ms
Setting value or at least
I
= 10 mA sec. and I
1st harm
2nd harm
1 A)
I
= 50 mA sec. and I
1st harm
2nd harm
5 A)
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
0.75 or
I
= 5 mA sec. (I
= 1 A) or
2nd harm
rated
I
= 25 mA sec. (I
= 5 A)
2nd harm
rated
According to specified tolerances
Slightly expanded tolerances
Inactive
Technical Data
12.11 Inrush-Current Detection
Increments of 0.001 A
Increments of 0.01 A
Increments of 1 %
Increments of 0.01 s
= 10 mA sec. (I
=
rated
= 50 mA sec. (I
=
rated
845
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