ABB REB670 Series - Breaker failure protection, single phase version CCSRBRF; Identification; Application

No. StartMode RetripMode t1 and t2 initiated
with
When t1 has
elapsed, TRRET will
When t2 or t2MPh
has elapsed, TRBU
will be given if
t1 and t2 and
t2MPh will be
stopped (reset) if
25 FollowStart&
Mode
Off external START
and current above
set level
never be given current is above
set level *) and
higher than
I>BlkCBPos or
CBCLDLx input
has logical value
one when current
is smaller than
I>BlkCBPos
current is below
set level *) or
external START
disappears
26 FollowStart&
Mode
UseFunction
Mode
external START
and current above
set level
be given if current
is above set level
of IPh> and higher
than I>BlkCBPos or
CBCLDLx input has
logical value one
when current is
smaller than
I>BlkCBPos
current is above
set level *) and
higher than
I>BlkCBPos or
CBCLDLx input
has logical value
one when current
is smaller than
I>BlkCBPos
current is below
set level *) or
external START
disappears
27 FollowStart&
Mode
Always external START
and current above
set level
be given if external
START is present
current is above
set level *) and
higher than
I>BlkCBPos or
CBCLDLx input
has logical value
one when current
is smaller than
I>BlkCBPos
current is below
set level *) or
external START
disappears
*) Set level depends on selected BuTripMode, that is, set level can be either IPh> or IN> or both.
7.7 Breaker failure protection, single phase version
CCSRBRF
SEMOD127864-1 v2
7.7.1 Identification
SEMOD127866-2 v2
Function description IEC 61850
identification
IEC 60617
identification
ANSI/IEEE C37.2
device number
Breaker failure protection, single
phase version
CCSRBRF
I>BF
SYMBOL-II V1 EN-US
50BF
7.7.2 Application
SEMOD127974-4 v3
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, single phase version (CCSRBRF) will issue a backup 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
1MRK 505 370-UEN D Section 7
Current protection
Busbar protection REB670 183
Application manual