ABB Relion 670 Series Applications Manual page 195

1MRK 511 401-UUS F
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 (50STB)
8.10.1 Identification
Function description
Stub protection
8.10.2 Application
In a breaker-and-a-half switchyard the line protection and the busbar protection normally have
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 breaker-and-a-half 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 (50STB) 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. STBPTOC (50STB) enables fast fault
clearance of faults at the section between the CTs and the open disconnector.
Bay control REC670
Application manual
RetripMode t1 and t2 initiated
with
UseFunctionM external START
ode and current above
set level
Always external START
and current above
set level
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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
Current protection
When t2 or t2MPh t1 and t2 and t2MPh
has elapsed, TRBU will be stopped
will be given if (reset) if
current is above set current is below
level *) and higher set level *) or
than I>BlkCBPos or external START
CBCLDLx input has disappears
logical value one
when current is
smaller than
I>BlkCBPos
current is above set current is below
level *) and higher set level *) or
than I>BlkCBPos or external START
CBCLDLx input has disappears
logical value one
when current is
smaller than
I>BlkCBPos
ANSI/IEEE C37.2
device number
50STB
Section 8
IP14515-1 v3
M17108-1 v2
M12904-3 v5
189