- If
CB failure trip mode
is set to "1 out of 3", the resetting logic requires that
the values of all the phase currents drop below the
Current value
setting.
- If
CB failure trip mode
is set to "1 out of 4", the resetting logic requires that
the values of the phase currents and the residual current drops below the
Current value
and
Current value Res
setting respectively.
- If
CB failure trip mode
is set to "2 out of 4", the resetting logic requires that
the values of all the phase currents and the residual current drop below the
Current value
and
Current value Res
setting.
• If
CB failure mode
is set to the "Breaker status" mode, the resetting logic requires
that the circuit breaker is in the open condition.
• If the
CB failure mode
setting is set to "Both", the resetting logic requires that
the circuit breaker is in the open condition and the values of the phase currents
and the residual current drops below the
Current value
and
Current value Res
setting respectively.
The activation of the BLOCK input resets the function.
Figure 238: Start logic
Timer 1
Once activated, the timer runs until the set
Retrip time
value has elapsed. The time
characteristic is according to DT. When the operation timer has reached the value
set with
Retrip time
, the retrip logic is activated. A typical setting is 0...50 ms.
Timer 2
Once activated, the timer runs until the set
CB failure delay
value has elapsed. The
time characteristic is according to DT. When the operation timer has reached the set
maximum time value
CB failure delay
, the backup trip logic is activated. The value of
1MRS758755 C
Protection related functions
REC615 & RER615
Technical Manual
483
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