ABB Relion REC670, Applications Manual

Page: 213 / 658

8.9.3 Setting guidelines
M11546-4 v9
The parameters for Breaker failure protection 3-phase activation and output CCRBRF
(50BF) are set via the local HMI or PCM600.
The following settings can be done for the breaker failure protection.
GlobalBaseSel : Selects the global base value group used by the function to define
IBase , VBase and SBase as applicable.
Operation : Disabled / Enabled
FunctionMode This parameter can be set Current or Contact . This states the way the
detection of failure of the breaker is performed. In the mode current the current
measurement is used for the detection. In the mode
Contact the long duration of
breaker position signal is used as indicator of failure of the breaker. The mode Current/
Contact means that both ways of detections are activated. Contact mode can be usable
in applications where the fault current through the circuit breaker is small. This can be
the case for some generator protection application (for example reverse power
protection) or in case of line ends with weak end infeed.
RetripMode : This setting states how the re-trip function shall operate. Retrip Off means
that the re-trip function is not activated. CB Pos Check (circuit breaker position check)
and Current means that a phase current must be larger than the operate level to allow
re-trip. CB Pos Check (circuit breaker position check) and Contact means re-trip is
done when circuit breaker is closed (breaker position is used). No CBPos Check means
re-trip is done without any check of breaker position.
Table 25: Dependencies between parameters RetripMode and FunctionMode
RetripMode FunctionMode
Description
Retrip Off
N/A the re-trip function is not
activated
CB Pos Check Current
re-trip is done if the phase
current is larger than the operate
level after re-trip time has
elapsed
Contact re-trip is done when auxiliary
contact position indicates that
breaker is still closed after re-trip
time has elapsed
Current/Contact both methods according to above
are used but taken into account
also
I>BlkCont
Table continues on next page
1MRK 511 401-UUS A
Section 8
Current protection
Bay control REC670 2.2 ANSI 207
Application manual