ABB REL650 - Stub Protection STBPTOC (50 STB)

Time
The fault
occurs
Protection
operate time
Trip and Pickup
CSPRBRF
Normal t
cbopen
Margin
Retrip delay t1 t
cbopen
after re-trip
t
BFPreset
Minimum back-up trip delay t2
Critical fault clearance time for stability
ANSI10000280-1-en.vsd
ANSI10000280 V1 EN
Figure 116: Time Sequence
7.12 Stub protection STBPTOC (50STB)
7.12.1 Identification
Function description
IEC 61850
identification
IEC 60617
identification
ANSI/IEEE C37.2
device number
Stub protection STBPTOC
3I>STUB
SYMBOL-T V1 EN
50STB
7.12.2 Application
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.
1MRK 506 334-UUS A Section 7
Current protection
237
Application manual