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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.
POSCLOSE
I >
From Level detector 1
Timer 1 elapsed
From Timer 1
OR
AND
AND
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”
AND
AND
AND
OR
OR
AND
TRRET
BLOCK
CB_FAULT_AL
From Timer 3
GUID-11B700C8-7CCF-41E4-89C7-741D4AC71887 V1 EN
Figure 391:
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
module (rising edge of the
PICKUP
input detected), and simultaneously
CB_FAULT_AL
is active. The operation of the backup logic depends on the
CB failure mode
setting.
•
If the
CB failure mode
is set to "Current", the activation of
TRBU
depends on the
CB
failure trip mode
setting.
•
If
CB failure trip mode
is set to "1 out of 3", the failure detection is based on any
of the phase currents exceeding the
Current value
setting. Once
TRBU
is
activated, it remains active for the time set with the
Trip pulse time
setting or
Section 5
1MAC059074-MB A
Protection related functions
778
615 series ANSI
Technical Manual
Содержание Relion 615 series
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