'(& )( )'& &) ( &!& ")& &$(( $# Ć %&( $# #)" &&#$
4 - 29
Siemens AG ⋅ May 1998
4.7.4 Recognition of a circuit breaker disturĆ
bance
For the purpose of recognizing a disturbance in the
tripping mechanism of the circuit breaker, the bay unit
provides the function "CB- disturbance "
(FNr. 7028/FE), which can be assigned to a binary
input. In the event of a breaker failure and simultaĆ
neous indication of "CB disturbance", instead of the
"T-CBF" (DA 6204/ZE) the time delay "T-CD-DIĆ
STURB" (DA 6206/ZE) is started for the circuit breaĆ
ker failure processing.
As T-CB-DISTURB is usually smaller than T-CBF
(DA 6204/ZE), the time for starting the CBF function
in the 7SS52 is reduced.
The signal CB disturbance is written into the alarm
buffer of the ZE as an event (coming/going)
(FNr. 87/ZE).
4.7.5 Control functions
4.7.5.1 Trip test with circuit breaker
The 7SS52 offers an easy method of testing the trip
circuits and the circuit breaker.
The test can be started from the master unit and
from each bay unit by control operation (figure 4.29).
An additional binary input function "CB test" (FNr.
1156/FE) is provided in the bay unit for a three-phase
test.
The related bay must be taken out of operation for
performing the circuit breaker test and the bay curĆ
rent must not exceed the threshold I<CB-TEST (DA
6313/ZE).
P >CB-TEST
DA 6313/ZE
operation ZE
(one-pole/three-pole)
bay current
bay out of service
CB-test
(only three-
pole test)
operation BU
(one-pole/three-pole)
DA 8200/ZE
1156/FE
DA 4400/FE
&
1
&
(feeder-selective)
1
CB-test
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