- 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
