Inherent Circuit-Breaker Failure Protection
Setting Values
Phase-current threshold
values
For I
rated
= 1 A
0.030 A to 35.000 A
Increments of 0.001 A
For I
rated
= 5 A
0.15 A to 175.00 A
Increments of 0.01 A
Threshold value sensitive For I
rated
= 1 A
0.030 A to 35.000 A
Increments of 0.001 A
For I
rated
= 5 A
0.15 A to 175.00 A
Increments of 0.01 A
Time delay T2 for 3-pole trip
0.050 s to 60.000 s
Increments of 0.001 s
Dropout
The larger dropout differential (=
| pickup threshold – dropout threshold |
) of the following 2
criteria is used:
Dropout differential
95 % of the pickup value
Minimum absolute dropout differential
Protection-class current transformers
15 mA sec. (I
rated
= 1 A) or
75 mA sec. (I
rated
= 5 A)
Instrument transformers
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 ≤ 90 Hz
Slightly expanded tolerances
f < 10 Hz
f > 90 Hz
Active
Tolerances
Threshold values
2 % of the setting value or 1 % of the rated current
Times
1 % of the setting value or 10 ms
Times
Pickup time, in the case of an internal start
< 1 ms
11.6
Technical Data
11.6 Inherent Circuit-Breaker Failure Protection
SIPROTEC 5, Low-Impedance Busbar Protection, Manual
919
C53000-G5040-C019-C, Edition 04.2021
