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Section 4
1MAC309294-MB F
Protection functions
244 RER620
Technical Manual
4.5.2 Single Phase Circuit breaker close failure protection 50BFC
4.5.2.1 Identification
4.5.2.2 Function block
Figure 113: Function block
4.5.2.3 Functionality
The breaker close failure function 50BFC is activated by close commands from either
internal auto reclose commands or external commands through START inputs. The pickup
or start input command can be single phase or common for all three phases depending on
the choice whether single phase or three phase breaker operation mode is chosen. 50BFC
includes a single or all three phase unconditional re-close function.
The function has a timer for attempting automatically a re-close timer for the repeated
closing of the intended breaker. A minimum close pulse length can be set independently
for the output.
The function contains a blocking functionality. It is possible to block the function outputs,
if desired.
4.5.2.4 Operation principle
The function can be enabled and disabled with the Operation setting. The corresponding
parameter values are Enable and Disable.
The operation of breaker close failure protection can be described by using a module
diagram, as shown in the top portion of the logic diagram shown in the figure next page.
The signal inputs POS_CLOSE_A, START_A and BLOCK inputs are processed in the
Start logic block. Any attempt to close the A pole of the breaker, as decided by the input
START_A input going high generates command to try reclosing the breaker after the set
close delay time, for a duration of close pule time, set in the unit. Alarm generation on
unsuccessful attempt can be done external to this logic in the unit.
Function description
IEC 61850
identification
IEC 60617
identification
ANSI/IEEE C37.2
device number
Circuit breaker close failure protection SCCBRBCF SCCBRBCF 50BFC
START
CLSRET
50BFC
BLOCK
POSCLOSE _A
CB_ FAULT
POSCLOSE
POSCLOSE
START_ A
CLS_RET_A
START_ B
START_ C
_B
_C
CLS_RET_B
CLS_RET_C