Siemens 6MD85, Manual

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!
CAUTION
Do not set a time that is too short.
If you set a time that is too short, there is a danger that the device contacts will interrupt the control
circuit. If this happens, the device contacts will burn out.
²
Set a time that is long enough to ensure that the circuit breaker reliably reaches its final position
(open or closed) after a control operation.
Parameter: Indicat. of breaking values
•
Default setting
(_:105) Indicat. of breaking values
=
always
With the
Indicat. of breaking values
parameter, you specify whether the measured values are to be
reported if the circuit breaker is opened via the control function.
Parameter Value Description
always
With this setting, the measured values are reported if the circuit breaker is
opened either via the control function or via the trip command of a protec-
tion 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 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
Function-Group Types
5.6 Function-Group Type Circuit Breaker, 1-/3-Pole
244 SIPROTEC 5, High-Voltage Bay Controller, Manual
C53000-G5040-C015-9, Edition 11.2017