Siemens 6MD85, Manual

Page: 1141 / 1256

Inrush-Current Detection
Setting Values
Operating limit I
max
0.030 A to 35.000 A
at I
rated
= 1 A
0.15 A to 175.00 A
at I
rated
= 5 A
Increments of 0.001 A
Increments of 0.01 A
Content 2nd harmonic 10 % to 45 % Increments of 1 %
Duration of the crossblock function 0.03 s to 200.00 s Increments of 0.01 s
Times
Pre-arcing times Approx. 29 ms
Dropout Ratios
Harmonic: I
2nd harm
/I
1st harm
0.95
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)
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 ≤ 80 Hz
Slightly expanded tolerances
f < 10 Hz
f > 80 Hz Inactive
Tolerances
Current measurement I
max
1 % of the setting value or 5 mA
Harmonic: I
2nd harm
/I
1st harm
1 % of the setting value with setting values
of I
2nd harm
/I
1st harm
Time delays 1 % of the setting value or 10 ms
11.12
Technical Data
11.12 Inrush-Current Detection
SIPROTEC 5, High-Voltage Bay Controller, Manual 1141
C53000-G5040-C015-9, Edition 11.2017