ABB Relion 670 Series Applications Manual page 190

Section 8
Current protection
No. StartMode
26 FollowStart&
Mode
27 FollowStart&
Mode
*) Set level depends on selected BuTripMode, that is, set level can be either IPh> or IN> or both.
8.10 Stub protection STBPTOC
8.10.1 Identification
Function description
Stub protection
8.10.2 Application
In a 1½-breaker switchyard, the line protection and the busbar protection normally overlap
when a connected object is in service. When an object is taken out of service it is normally
required to keep the diagonal of the 1½-breaker switchyard in operation. This is done by
opening the disconnector to the protected object. This will, however, disable the normal object
protection (for example the distance protection) of the energized part between the circuit
breakers and the open disconnector.
Stub protection STBPTOC is a simple phase overcurrent protection, fed from the two current
transformer groups feeding the object taken out of service. The stub protection is only
activated when the disconnector of the object is open. STBPTOCenables fast fault clearance of
faults at the section between the CTs and the open disconnector.
184
RetripMode t1 and t2 initiated
with
UseFunction external START
Mode and current above
set level
Always external START
and current above
set level
© Copyright 2017 Hitachi Power Grids. All rights reserved
When t1 has
elapsed, TRRET will
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
STBPTOC
3I>STUB
SYMBOL-T V1 EN-US
1MRK 511 401-UEN Rev. K
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
ANSI/IEEE C37.2
device number
50STB
Bay control REC670
Application manual
IP14515-1 v3
M17108-1 v2
M12904-3 v6