ABB REL670 2.2 IEC - Stub Protection STBPTOC

9.9 Stub protection STBPTOC
IP14515-1 v3
9.9.1 Identification
M17108-1 v2
Function description IEC 61850
identification
IEC 60617
identification
ANSI/IEEE C37.2
device number
Stub protection STBPTOC
3I>STUB
SYMBOL-T V1 EN-US
50STB
9.9.2 Application
M12904-3 v5
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.
1MRK 506 369-UEN B Section 9
Current protection
Line distance protection REL670 2.2 IEC 511
Application manual