ABB RELION REX640 Technical Manual page 1170

Protection related functions
Value of setting CB
failure mode
Breaker status
Both(AND)
Both(OR)
Once activated, TRBU remains active until the set
for activation are reset. TRRET is also reset if BLOCK is activated.
1170
Value of setting CB
failure trip mode
1 out of 3
1 out of 4
2 out of 4
1 out of 3
1 out of 4
2 out of 4
1 out of 3
1 out of 4
2 out of 4
In most applications, "1 out of 3" is sufficient.
Conditions for activating Backup trip logic
• Two or three phase currents exceed
rent value setting.
CB is in closed position.
CB is in closed position and any phase cur-
Current value setting.
rent exceeds
CB is in closed position and either of the fol-
lowing is true:
• Any phase current exceeds
setting.
• The residual current exceeds
ue Res setting.
CB is in closed position and either of the fol-
lowing is true:
• Any phase current exceeds
setting and the residual current exceeds
Current value Res setting.
• Two or three phase currents exceed
rent value setting.
Either of the following is true:
• CB is in closed position.
• Any phase current exceeds
setting.
One of the following is true:
• CB is in closed position.
• Any phase current exceeds
setting.
• The residual current exceeds
ue Res setting.
One of the following is true:
• CB is in closed position.
• Any phase current exceeds
setting and the residual current exceeds
Current value Res setting.
• Two or three phase currents exceed
rent value setting.
Trip pulse time or until the reasons
1MRS759142 F
Cur-
Current value
Current val-
Current value
Cur-
Current value
Current value
Current val-
Current value
Cur-
REX640
Technical Manual