Breaker Failure Protection, Single Phase Version Ccsrbrf (50Bf); Identification; Application; Setting Guidelines - ABB REB670 Applications Manual

Section 7
Current protection
7.7
7.7.1
7.7.2
7.7.3
206
Breaker failure protection, single phase version
CCSRBRF (50BF)

Identification

Function description
Breaker failure protection, single phase
version

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.

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
IEC 61850 IEC 60617
identification identification
CCSRBRF
I>BF
SYMBOL-II V1 EN
1MRK 505 337-UUS -
ANSI/IEEE C37.2
device number
50BF
Application manual