Breaker Failure Protection Ccrbrf; Identification; Application; Setting Guidelines - ABB Relion REC670 Applications Manual

1MRK 511 358-UEN A
7.9

Breaker failure protection CCRBRF

7.9.1

Identification

Function description
Breaker failure protection, 3-phase
activation and output
7.9.2

Application

In the design of the fault clearance system the N-1 criterion is often used. This means that a
fault needs to 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, 3-phase activation and output (CCRBRF) 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).
CCRBRF 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.
7.9.3

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
indicator of failure of the breaker. The mode
detections are activated.
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.
Application manual
IEC 61850
identification
CCRBRF
Contact the long duration of breaker position signal is used as
Current&Contact means that both ways of
Contact mode can be usable in applications where the fault current
CB Pos Check (circuit breaker position check) and Current
IEC 60617 ANSI/IEEE C37.2
identification device number
50BF
3I>BF
SYMBOL-U V1 EN-US
Section 7
Current protection
IP14514-1 v6
M14878-1 v5
M13916-3 v6
M11546-4 v8.1.1
147