9.8 Breaker failure protection CCRBRF(50BF)
IP14514-1 v6
9.8.1 Identification
M14878-1 v5
Function description IEC 61850
identification
IEC 60617
identification
ANSI/IEEE C37.2
device number
Breaker failure protection, 3-phase
activation and output
CCRBRF
SYMBOL-U V1 EN-US
50BF
9.8.2 Application
M13916-3 v7
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 object. Instead a breaker failure protection is used.
Breaker failure protection, 3-phase activation and output (CCRBRF, 50BF) 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 object. 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 (50BF) 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 testing.
9.8.3 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
1MRK 502 071-UUS A Section 9
Current protection
Generator protection REG670 2.2 ANSI and Injection equipment REX060, REX061, REX062 399
Application manual
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