ABB RELION REF615R Technical Manual page 329

1MRS240050-IB C
REF615R
Technical Manual
• The retrip logic is inactive if the CB fail retrip mode setting is set to "Disabled".
• 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 time 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
"Curren t ch eck"
CB failu re mo de "Cu rrent"
CB failu re mo de "Br eaker
status"
CB failu re mo de "Bo th"
50P
From Level detector 1
POSCLOSE
OR
CB_FAULT_AL
From Timer 3
BLOCK
GUID-BD64DEDB-758C-4F53-8287-336E43C750F2-ANSI V2 EN
Figure 158: 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 signal from the start logic
Protection-related functions
AND
AND
AND
OR
AND
AND
Section 5
OR
TRRET
AND
323