Breaker Failure Protection, Single Phase Version Ccsrbrf (50Bf); Identification; Application; Setting Guidelines - ABB Relion 670 Series Applications Manual

1MRK 511 358-UUS A
7.10 Breaker failure protection, single phase version CCSRBRF
(50BF)
7.10.1

Identification

Function description
Breaker failure protection, single
phase version
7.10.2

Application

In the design of the fault clearance system the N-1 criterion is often used. This means that a fault
shall be cleared even if any component in the fault clearance system is faulty. One necessary
component in the fault clearance system is the circuit breaker. It is from practical and economical
reason not feasible to duplicate the circuit breaker for the protected component. Instead a
breaker failure protection is used.
Breaker failure protection, single phase version (CCSRBRF,50BF) function will issue a back-up trip
command to adjacent circuit breakers in case of failure to trip of the "normal" circuit breaker for
the protected component. The detection of failure to break the current through the breaker is
made by means of current measurement or as detection of remaining trip signal (unconditional).
CCSRBRF (50BF) function can also give a re-trip. This means that a second trip signal is sent to the
protected circuit breaker. The re-trip function can be used to increase the probability of operation
of the breaker, or it can be used to avoid back-up trip of many breakers in case of mistakes during
relay maintenance and test.
7.10.3

Setting guidelines

The parameters for Breaker failure protection, single phase version (CCSRBRF,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 ).
Operation : Disabled or Enabled
FunctionMode: This parameter can be set to Current or Contact . This states the way the detection
of failure of the breaker is performed. In the mode
the detection. In the mode
failure of the breaker. The mode
activated.
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.
Application manual
Contact the long duration of initiate signal (trip) is used as indicator of
Current&Contact means that both ways of detections are
Contact mode can be usable in applications where the fault current through the circuit
IEC 61850 IEC 60617
identification identification
CCSRBRF
I>BF
SYMBOL-II V1 EN-US
Current the current measurement is used for
Current protection
ANSI/IEEE C37.2
device number
50BF
Section 7
SEMOD127864-1 v2
SEMOD127866-2 v2
SEMOD127974-4 v2
SEMOD127980-4 v5
173