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GUID-1A2C47ED-0DCF-4225-9294-2AEC97C14D5E V1 EN
Figure 390:
Timeline of the breaker failure protection
Timer 3
This module is activated by the
CB_FAULT
signal. Once activated, the timer runs until the
set
CB fault delay
value has elapsed. The time characteristic is according to DT. When the
operation timer has reached the maximum time value
CB fault delay
, the
CB_FAULT_AL
output is activated. After the set time, an alarm is given so that the circuit breaker can be
repaired. A typical value is 5 s.
Retrip logic
The retrip logic provides the
TRRET
output, which can be used to give a retrip signal for
the main circuit breaker. Timer 1 activates the retrip logic. The operation 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 "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
1MAC059074-MB A
Section 5
Protection related functions
615 series ANSI
777
Technical Manual
Содержание Relion 615 series
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