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Technical Data
12.3 Circuit-Breaker Failure Protection
12.3
Circuit-Breaker Failure Protection
Starting Conditions
For circuit-breaker failure protection
Setting Values
Phase-current threshold
values
Threshold value sensitive
Supervision time of release signal
Time delays T1
Time delays T2
Supervision times of binary inputs
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
Instrument transformers
Circuit-Breaker Supervision
Supervision of circuit-breaker auxiliary-contact position
For 3-pole CB tripping
For 1-pole CB tripping
NOTE
i
i
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).
Via binary inputs
31
32
Via binary inputs
802
1 A @ 100 Irated
5 A @ 100 Irated
1 A @ 1.6 Irated
5 A @ 1.6 Irated
1 A @ 100 Irated
5 A @ 100 Irated
1 A @ 1.6 Irated
5 A @ 1.6 Irated
1-pole tripping internal or external
3-pole tripping internal or external
0.030 A to 35.000 A
0.15 A to 175.00 A
0.001 A to 1.600 A
0.005 A to 8.000 A
0.030 A to 35.000 A
0.15 A to 175.00 A
0.001 A to 1.600 A
0.005 A to 8.000 A
0.00 s to 1.00 s
0.000 s to 60.000 s
0.050 s to 60.000 s
0.05 s to 60.00 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
1 input each for make contact and break contact
1 input each for auxiliary contact per pole or
1 input for each series connection make contact and
break contact
SIPROTEC 5, Merging Unit 6MU85, Manual
C53000-G5040-C074-1, Edition 01.2020
31
32
Increments of 0.001 A
Increments of 0.01 A
Increments of 0.001 A
Increments of 0.001 A
Increments of 0.001 A
Increments of 0.01 A
Increments of 0.001 A
Increments of 0.001 A
Increments of 0.01 s
Increments of 0.001 s
Increments of 0.001 s
Increments of 0.01 s
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