Parameter Value Description
always
With this setting, the measured values are reported if the circuit breaker is
opened either via the control function or the trip command of a protection
function.
with trip
With this setting, the measured values are only reported if the circuit
breaker is opened via the trip command of a protection function.
Measured Values
If a protection function trips the circuit breaker, the following measured values are stored in the fault log.
•
Break.-current phs A
•
Break.-current phs B
•
Break.-current phs C
•
Break. current 3I0/IN
•
Break. voltage phs A
•
Break. voltage phs B
•
Break. voltage phs C
The measured value
Break. current 3I0/IN
is the neutral-point current. Depending on the connection
type of the measuring point I-3ph connected with the Circuit-breaker function group, the neutral-point
current is differentiated as follows:
Connection Type of the Measuring Point I-3ph
Neutral-Point Current
3-phase Calculated zero-sequence current 3I
0
3-phase + IN
3-phase + IN separate
3-phase, 2-p. transformer + IN separate
2-phase, 2-p. transformer + IN separate
Measured neutral-point current I
N
Output Signal: Indication Suppression
Whereas in the case of feeders without an automatic reclosing function every trip command is final due to a
protection function, the use of an automatic reclosing function should only cause the motion detector of the
circuit breaker (fleeting contact on the circuit breaker) to trigger an alarm if tripping of the circuit breaker is
definitive (see next figure for more details). Likewise, a tripping alarm should not be triggered for switching
operations by the control.
For this, the alarm activation circuit should be looped via a suitably routed output contact of the device
(output signal Alarm suppression). In the idle state and when the device is switched off, this contact is
permanently closed. For this, an output contact with a break contact must be routed. The contact opens
whenever the output signal Alarm suppression becomes active, so that tripping or a switching operation
does not cause an alarm (see the logic in 5.7.7.3 Acquisition of Circuit-Breaker Auxiliary Contacts and Further
Information for more details).
[loschalt-081210-01.tif, 2, en_US]
Figure 5-85 Circuit-Breaker Tripping Alarm Suppression
Function-Group Types
5.7 Function-Group Type Circuit Breaker
SIPROTEC 5, Overcurrent Protection, Manual 289
C53000-G5040-C017-8, Edition 07.2017
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