Circuit-Breaker Failure Protection
Starting Conditions
For circuit-breaker failure protection
1-pole tripping internal or external
31
3-pole tripping internal or external
32
Setting Values
Phase-current threshold
values
1 A @ 100 Irated
0.030 A to 35.000 A
Increments of 0.001 A
5 A @ 100 Irated
0.15 A to 175.00 A
Increments of 0.01 A
1 A @ 1.6 Irated
0.001 A to 1.600 A
Increments of 0.001 A
5 A @ 1.6 Irated
0.005 A to 8.000 A
Increments of 0.001 A
Threshold value sensitive 1 A @ 100 Irated
0.030 A to 35.000 A
Increments of 0.001 A
5 A @ 100 Irated
0.15 A to 175.00 A
Increments of 0.01 A
1 A @ 1.6 Irated
0.001 A to 1.600 A
Increments of 0.001 A
5 A @ 1.6 Irated
0.005 A to 8.000 A
Increments of 0.001 A
Supervision time of release signal
0.00 s to 1.00 s
Increments of 0.01 s
Time delays T1
0.000 s to 60.000 s
Increments of 0.001 s
Time delays T2
0.050 s to 60.000 s
Increments of 0.001 s
Supervision times of binary inputs
0.05 s to 60.00 s
Increments of 0.01 s
Dropout
The larger dropout differential (=
| pickup threshold – dropout threshold |
) of the following 2
criteria is used:
Dropout differential derived from the parameter
Dropout ratio
If this parameter is not available, a dropout ratio of 95 % applies to the current threshold values.
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)
Circuit-Breaker Supervision
Supervision of circuit-breaker auxiliary-contact position
For 3-pole CB tripping
1 input each for make contact and break contact
For 1-pole CB tripping
1 input each for auxiliary contact per pole or
1 input for each series connection make contact and
break contact
i
i
NOTE
The circuit-breaker failure protection can also work without the circuit-breaker auxiliary contacts stated.
Auxiliary contacts are required for circuit-breaker failure protection in cases where the current flow is
absent or too low for tripping (for example with a transformer or a Buchholz protection).
12.3
31
Via binary inputs
32
Via binary inputs
Technical Data
12.3 Circuit-Breaker Failure Protection
802
SIPROTEC 5, Merging Unit 6MU85, Manual
C53000-G5040-C074-1, Edition 01.2020