Stub Protection Stbptoc - ABB REC670 Applications Manual

1MRK 511 401-UEN A
8.10
8.10.1
8.10.2
Bay control REC670 2.2 IEC
Application manual

Stub protection STBPTOC

Identification
Function description
Stub protection
Application
In a 1½-breaker 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 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.
Current protection
IEC 61850 IEC 60617
identification identification
STBPTOC
3I>STUB
SYMBOL-T V1 EN-US
Section 8
IP14515-1 v3
M17108-1 v2
ANSI/IEEE C37.2
device number
50STB
M12904-3 v5
199