ABB RED615 Technical Manual page 552

Section 5
Protection related functions
546
of the retrip logic depends on the CB fail retrip mode setting. The retrip logic is
inactive if the CB fail retrip mode setting is set to "Off".
If CB fail retrip mode is set to the "Current check" mode, the activation of the
retrip output TRRET depends on the CB failure mode setting.
• If CB failure mode is set to the "Current" mode, TRRET is activated when the
value of any phase current exceeds the Current value setting. The TRRET
output remains active for the time set with the Trip pulse time setting or until
all phase current values drop below the Current value setting, whichever is
longer.
• If CB failure mode is set to the "Breaker status" mode, TRRET is activated if
the circuit breaker is in the closed position. The TRRET output remains active
for the time set with the Trip pulse time setting or the time the circuit breaker
is in the closed position, whichever is longer.
• If CB failure mode is set to "Both", TRRET is activated when either of the
"Breaker status" or "Current" mode condition is satisfied.
If CB fail retrip mode is set to the "Without check" mode, TRRET is activated once
the timer 1 is activated without checking the current level. The TRRET output
remains active for a fixed time set with the Trip pulse timer setting.
The activation of the BLOCK input or the CB_FAULT_AL output deactivates the
TRRET output.
Timer 1 elapsed
From Timer 1
CB fail retrip mode
"Without check"
CB fail retrip mode
"Current check"
CB failure mode "Current"
CB failure mode "Breaker
status"
CB failure mode "Both"
I >
From Level detector 1
POSCLOSE
CB_FAULT_AL
From Timer 3
BLOCK
GUID-BD64DEDB-758C-4F53-8287-336E43C750F2 V2 EN
Figure 288: Retrip logic
Backup trip logic
The backup trip logic provides the TRBU output which can be used to trip the
upstream backup circuit breaker when the main circuit breaker fails to clear the
fault. The backup trip logic is activated by the timer 2 module or timer-enabling
AND
OR
AND
AND
OR
1YHT530004D05 D
AND
OR
AND
AND
Technical Manual
TRRET
615 series