ABB REB670 Series Applications Manual page 189

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