Siemens 6MD85, Manual

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Measured Values
If a protection function opens the circuit breaker, the following measured values can be 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 that is connected to the Circuit-breaker function group, the neutral-point
current differs 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
3ph, 2prim.CT + IN-sep.
2ph, 2p. CT + IN-sep. 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
always 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 5.5.7.3 Acquisition of Circuit-Breaker Auxiliary Contacts and Further Informa-
tion for more details).
[loschalt-081210-01.tif, 2, en_US]
Figure 5-28 Circuit-Breaker Tripping Alarm Suppression
Settings
Addr. Parameter C Setting Options Default Setting
Circuit break.
_:101 Circuit break.:Output
time 0.02 s to 1800.00 s 0.10 s
5.5.7.7
Function-Group Types
5.5 Function-Group Type Circuit Breaker, 3-Pole
222 SIPROTEC 5, High-Voltage Bay Controller, Manual
C53000-G5040-C015-9, Edition 11.2017