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11.28
Circuit-Breaker Failure Protection
Starting Conditions
For circuit-breaker failure protection
Setting Values
Phase-current threshold
values
Sensitive threshold value
Supervision time of release signal
Time delays T1
Time delays T2
Monitoring times of the binary inputs
Dropout
The greater dropout differential (= | pickup threshold – dropout threshold |) of the following 2
criteria applies:
Dropout differential
Minimum absolute dropout differential
Protection-class current transformer
Instrument current transformer
Circuit-Breaker Supervision
Position supervision via circuit-breaker auxiliary contacts
For 3-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).
Times
Pickup time, in the case of an internal start
Pickup time, in the case of an external start
Typical dropout time
Dropout time via circuit-breaker auxiliary contact
criterion
84
Via binary inputs
SIPROTEC 5, High-Voltage Bay Controller, Manual
C53000-G5040-C015-9, Edition 11.2017
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
11.28 Circuit-Breaker Failure Protection
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
95 % of the pickup value
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 ms
< 5 ms
< 15 ms
< 5 ms
Technical Data
84
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
1167
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