Woodward highprotec MRI4, User Manual

Page: 567 / 727

Supervision
Setting Group Parameters of the CBF
In order to prevent a faulty activation of the BF Module, the pickup (alarm) time
must be greater than the sum of:
Operating time of the protective relay
+The close-open time of the breaker (please refer to the technical data of
the manufacturer of the breaker);
+Drop off time (current- or position indicators)
+Security margin.
Parameter Description Setting range Default Menu path
Function Permanent activation or deactivation of
module/stage.
inactive,
active
inactive [Protection
Para
/<1..4>
/Supervision
/CBF]
ExBlo Fc Activate (allow) or inactivate (disallow)
blocking of the module/stage. This
parameter is only effective if a signal is
assigned to the corresponding global
protection parameter. If the signal becomes
true, those modules/stages are blocked that
are parameterized "ExBlo Fc=active".
inactive,
active
inactive [Protection
Para
/<1..4>
/Supervision
/CBF]
I-CBF > Breaker Failure Alarm will be initiated if this
threshold is still exceeded after the timer
has expired (50 BF).
Only available if: Scheme50BF = Or Scheme
= 50BF and CB Pos
0.02 - 4.00In 0.02In [Protection
Para
/<1..4>
/Supervision
/CBF]
t-CBF If the delay time is expired, an CBF alarm is
given out.
0.00 - 10.00s 0.20s [Protection
Para
/<1..4>
/Supervision
/CBF]
567 MRI4 DOK-HB-MRI4-2E