Functions
6-204 7SA522 Manual
C53000-G1176-C119-2
Figure 6-101 Breaker failure protection with common phase initiation
Phase segregated
initiation
Phase segregated initiation of the breaker failure protection is necessary if the circuit
breaker poles can be operated individually, e.g. if single-pole automatic reclosure is
used. This is possible if the device is able to trip single-pole.
If initiation of the breaker failure protection must also be possible by further external
protection devices, it is recommended, for security reasons, to connect an additional
release signal (e.g. fault detection) at the input “!%)5HOHDVH”, besides the trip com-
mands at the inputs “!%)6WDUW/”, “!%)6WDUW/”, and “!%)6WDUW/”. Fig-
ure 6-102 shows the connections of this dual-channel initiation.
Nevertheless, it is possible to initiate the breaker failure protection in single-channel
mode should a separate release criterion not be available. The binary input ´!%)5H
OHDVH” must then not be assigned to any physical input of the device during configu-
ration.
If the external protection device does not provide a general fault detection signal, a
general trip signal can be used instead. Alternatively, the parallel connection of a sep-
arate set of trip contacts can produce such a release signal as shown in Figure 6-103.
The starting condition logic for the delay times is shown in Figure 6-104, 6-105, 6-106.
In principle, it is designed similar to that for the common phase initiation, but, individ-
ually for each of the three phases. Thus, current flow and initiation conditions are proc-
essed for each phase. In case of single-pole interruption during an automatic reclose
cycle, current disappearance is reliably monitored for the tripped breaker pole only.
&
Start internal w/o l
>BF Start 3pole
&
Start L123
>BF release
>BLOCK BkrFail
not allocated
allocated
„1“
Configuration
Internal blocking
>
1
>
1
>BF Start w/o l
Start internal 3pole
&
L2>
L3>
L1>
CBaux≥1pole closed
<HV
1R
>
1
>
1
&
&KN%5.&217$&7
BF Start
>
1
(similar to Fig 6-100)
(from Fig 6-99)
FNo 1432
FNo 1403
FNo 1415
FNo 1439
FNo 1461
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