Section 4 1MDU07212-YN Rev. C
Protection and Control Function
22 REF601 / REJ601
Application Manual
Backup trip function
The Timer 2 for backup trip function activates after timer 1 expires. Once
activated, the timer runs until the set t
backup
value has elapsed. The time
characteristic is according to definite time. When the operation timer has reached
the maximum time value, the BF STAGE2 output is activated.
In both retrip as well backup trip conditions, the timer reset immediately when the
current value in all three phases decreases below I
CBFP
, and neutral current decrease
below I
OCBFP
.
However in case where CB closed position information is also used, the timer
resets immediately when CB closed position changes to False (i.e. CB opens).
Inter-trip receive function
This block accepts the breaker failure inter trip input from the other IED. The input
is accepted on receipt of binary input BF RECTRIP provided its own BF STAGE2
is not active.
The inter-trip logic on acceptance of receipt of binary input will activate binary
output BF RECTRIP if the level detector is reporting the exceeding of the value.
The pulse duration of BF STAGE1, BF STAGE2 and BF RECTRIP output is
200ms.
Table 12: Setting ranges Breaker failure protection
Parameter Value (Range)
Operating phase current, ‘ICBFP’ 0.2…2.0 x In, in steps of 0.1
Operating neutral current, ‘IoCBFP’ 0.1…2.0 x In, in steps of 0.1
Time delay for retrip, ‘tretrip’ 0.06…0.5 sec, in steps of 0.01
Time delay for backup protection,
‘tbackup’
0.06…0.5 sec, in steps of 0.01
Block the circuit breaker failure
protection
0 = No, 1 = Yes
Operation accuracy ± 5.0% of set value
Operation time accuracy 3% of set value or ± 30ms
Reset ratio 0.98
4.7 Setting groups
With the version of REF601/REJ601 Ver. 2.2 FP1 also the usage of two setting
groups for protection functions are available.
The usage of both setting groups could be set by parameters in the setting menu
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