CYG PRS-7367 - 50 BF Protection Principle

Protection Functions
66 PRS-7367
I3P
50BF
ExtStr
Block
CB_Open
CB_Close
ReTrOp
BFTrOp1
Str
CBF
BFTrOp2
DZTrOp
CBF ALM
CurDet
Figure 3.7-1 Function block
3.7.1.2 Signals
Table 3.7-1 Input Signals
Signal
Description
I3P
The current magnitude in all the three phases
ExtStr
The external 50BF start command
Block
The block signal of function
CB_Open
The CB open signal
CB_Close
The CB close signal
CBF
The BI signal that CB is faulty and unable to trip by external
checked
Table 3.7-2 Output Signals
Signal
Description
Str
This is the integrated start signal
CurDet
The current detector condition
ReTrOp
The retrip command of the CB.
BFTrOp1
The BF trip command of the CB
BFTrOp2
The BF trip command of the backup CB
DZTrOp
The Dead zone trip command of the backup CB
CBF ALM
The CB FAULT ALM output
3.7.2 50BF Protection Principle
The breaker failure protection function can be enabled or disabled by setting the corresponding
50BF_Ena parameter values as "1" or "0".