Inrush-Current Detection - Siemens Siprotec 5 7SS85 Techical Data

11.30

Inrush-Current Detection

Setting Values
Operating range limit I
Component of 2nd harmonic
Duration of the crossblock function
Times
Pickup times
Dropout Ratios
Harmonic:
I /I
2nd harm 1st harm
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
Frequency Operating Range
0.9 ≤ f/f ≤ 1.1
rated
10 Hz ≤ f < 0.9 f
1.1 f < f ≤ 80 Hz
rated
f < 10 Hz
f > 80 Hz
Tolerances
Current measurement I
Harmonic: I
2nd harm
Time delays
SIPROTEC 5, Low-Impedance Busbar Protection 7SS85, Manual
C53000-G5040-C019-6, Edition 06.2016
max
rated
max
/I
1st harm
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
0.95
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
According to specified tolerances
Slightly expanded tolerances
Inactive
1 % of the setting value or 5 mA
1 % of the setting value
for settings of l /
2nd harm 1st harm
1 % of the setting value or 10 ms
Technical Data
11.30 Inrush-Current Detection
Increments of 0.001 A
Increments of 0.01 A
Increments of 1 %
Increments of 0.01 s
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