Inherent Circuit-Breaker Failure Protection - Siemens Siprotec 5 7SS85 Techical Data

11.6

Inherent Circuit-Breaker Failure Protection

Setting Values
Phase-current threshold
values
Threshold value sensitive
Delay T2 for 3-pole trip
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
Threshold values
Times
SIPROTEC 5, Low-Impedance Busbar Protection 7SS85, Manual
C53000-G5040-C019-6, Edition 06.2016
For I = 1 A
rated
For I = 5 A
rated
For I = 1 A
rated
For I = 5 A
rated
rated
11.6 Inherent Circuit-Breaker Failure Protection
0.03 A to 35.00 A
0.15 A to 175.00 A
0.03 A to 35.00 A
0.15 A to 175.00 A
0.05 s to 60 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
According to specified tolerances
Slightly expanded tolerances
Active
2 % of the setting value or 1 % of the rated current
1 % of the setting value or 10 ms
Technical Data
Increments of 0.01 A
Increments of 0.01 A
Increments of 0.001 s
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