ABB REQ650 - Stub Protection (STBPTOC)

6.9.3 Setting guidelines
The parameters for Breaker failure protection 3-phase activation and output CCRBRF
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), (UBase) and (SBase).
Operation: Off/On
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 check of breaker position.
Table 18: Dependencies between parameters RetripMode and FunctionMode
RetripMode
FunctionMode Description
Retrip Off N/A the re-trip function is not
activated
CB Pos Check Current a phase current must be larger
than the operate level to allow
re-trip
Contact
re-trip is done when breaker
position indicates that breaker is
still closed after re-trip time has
elapsed
Current&Contact
both methods are used
No CBPos Check Current re-trip is done without check of
breaker position
Contact re-trip is done without check of
breaker position
Current&Contact both methods are used
BuTripMode: Back-up trip mode is given to state sufficient current criteria to detect
failure to break. For Current operation 2 out of 4 means that at least two currents, of
the three-phase currents and the residual current, shall be high to indicate breaker
Section 6 1MRK 505 291-UEN A
Current protection
134
Application manual